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Physics 101 Mechanics
October 2021
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Physics 101 Mechanics Q&A Archive of October 15, 2021

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October 15 of 2021

the passengers in a rollercoaster car feel 50% heavier than their true weight as the car goes through a dip with a 30m radius curvature. What is the car's speed at the bottom of the dip?

A very long frictionless air track is tilted so it is at a 3.00 degree angle from the horizontal. A motion sensor is placed at the low end of the track so that it can measure the motion of a glider as the glider moves along the track. The motion sensor establishes the x-axis: The origin (0.0…

If the spring has a spring rate of 12800 N/m how much would it need to be compressed so the release valve stays closed to a maximum pressure of 470 kPag?

A pressure release valve is made from a spring keeping a disc pushed into a hole in a pressurized tank. The hole has an area of 382 mm2. If the spring has a spring rate of 12800 N/m how much would it need to be compressed so the release valve stays closed to a maximum pressure of 470 kPag?

A car gets 44 miles/gallon on the highway and 20 miles/gallon in the city. Estimate the average miles/gallon for a trip consisting of 60 miles on the highway and 10 miles in the city, then convert this number to SI units (km/L).

boy having a mass equal to 40 kilograms is standing in an elevator. The force felt by the feet of the boy will be greatest when the elevator (a) Stands still (b) Moves downward at a constant velocity of 4 metres/sec (c) Accelerates downward with an acceleration equal to 2 4 metres /…

A vehicle of 100 kg is moving with a velocity of 5 m/sec. To stop it in sec 1/10 , the required force in opposite direction is

In a rocket of mass 1000 kg fuel is consumed at a rate of 40 kg/s. The velocity of the gases ejected from the rocket is 5 X 10 ^4m / s ? . The thrust on the rocket is

An elevator weighing 6000 kg is pulled upward by a cable with an acceleration of 5 m/s². Taking g to be 10 m/s², then the tension in the cable is

A body of mass 4 kg weighs 4.8 kg when suspended in a moving lift. The acceleration of the lift is

Gravels are dropped on a conveyor belt at the rate of 0.5 kg/sec. The extra force required in newtons to keep the belt moving at 2 m/sec is

A block of metal weighing 2 kg is resting on a frictionless plane. It is struck by a jet releasing water at a rate of 1 kg/sec and at a speed of 5 m/sec. The initial acceleration of the block will be

A parachutist of weight ‘w’ strikes the ground with his legs fixed and comes to rest with an upward acceleration of magnitude 3 g. Force exerted on him by ground during landing is (a) w (b) 2w (c) 3w (d) 4w

A particle of mass 0.3 kg is subjected to a force F ? ?kx with k ? 15 N /m. What will be its initial acceleration if it is released from a point 20 cm away from the origin

At a place where the acceleration due to gravity is 10 m/sec^2 a force of 5 kg-wt acts on a body of mass 10 kg initially at rest. The velocity of the body after 4 second is

In doubling the mass and acceleration of the mass, the force acting on the mass with respect to the previous value (a) Decreases to half (b) Remains unchanged (c) Increases two times (d) Increases four times

When 1 N force acts on 1 kg body that is able to move freely, the body receives [CPMT 1971] (a) A speed of 1 m/sec (b) An acceleration of 1 m/sec² (c) An acceleration of 980 cm/sec² (d) An acceleration of 1 cm/sec²

A body of mass 40 gm is moving with a constant velocity of 2 cm/sec on a horizontal frictionless table. The force on the table is (a) 39200 dyne (b) 160 dyne (c) 80 dyne (d) Zero dyne

An object with a mass 10 kg moves at a constant velocity of 10 m/sec. A constant force then acts for 4 second on the object and gives it a speed of 2 m/sec in opposite direction. The acceleration produced in it, is

A force of 5 N acts on a body of weight 9.8 N. What is the acceleration produced in m/sec2 [NCERT 1990] (a) 49.00 (b) 5.00 (c) 1.46 (d) 0.51

A man weighing 80 kg is standing in a trolley weighing 320 kg. The trolley is resting on frictionless horizontal rails. If the man starts walking on the trolley with a speed of 1 m / s, then after 4 sec his displacement relative to the ground will be [(a) 5 m (b) 4.8 m (c) 3.2 m (d) 3.0 m

If the tension in the cable of 1000 kg elevator is 1000 kg weight, the elevator [NCERT 1971] (a) Is accelerating upwards (b) Is accelerating downwards (c) May be at rest or accelerating (d) May be at rest or in uniform motion

A coin is dropped in a lift. It takes time t 1to reach the floor when lift is stationary. It takes time t2 when lift is moving up with constant acceleration. Then relation between t1 and t2 is?

in a lift. If the lift descends with an acceleration equal to the acceleration due to gravity ‘g’, the reading on the spring balance will be [NCERT 1977] (a) 2 kg (b) (4 ? g)kg (c) (2? g)kg (d) Zero

A body of mass 2 kg moving on a horizontal surface with an initial velocity of 4 m/sec comes to rest after 2 sec. If one wants to keep this body moving on the same surface with a velocity of 4 m/sec, the force required is [NCERT 1977] (a) 8 N (b) 4 N (c) Zero (d) 2 N

diwali rocket is ejecting 0.05 kg of gases per second at a velocity of 400 m/sec. The accelerating force on the rocket is [NCERT 1979; DPMT 2001; MP PMT 2004] (a) 20 dynes (b) 20 N (c) 22 dynes (d) 1000 N

An object will continue moving uniformly until (a) The resultant force acting on it begins to decrease (b) The resultant force on it is zero (c) The resultant force is at right angle to its rotation (d) The resultant force on it is increased continuously

A force of 100 N acts on mass of 5 gm for 10 sec. The velocity produced is

Newton's second law gives the measure of [CPMT 1982] (a) Acceleration (b) Force (c) Momentum (d) Angular momentum

If a bullet of mass 5 gm moving with velocity 100 m /sec, penetrates the wooden block upto 6 cm. Then the average force imposed by the bullet on the block is (a) 8300 N (b) 417 N (c) 830 N (d) Zero

person sitting in an open car moving at constant velocity throws a ball vertically up into air. The ball falls [EAMCET (Med.) 1995; MH CET 2003;BCECE 2004] (a) Outside the car (b) In the car ahead of the person (c) In the car to the side of the person (d) Exactly in the hand which threw…

When a bus suddenly takes a turn, the passengers are thrown outwards because of [AFMC 1999; CPMT 2000, 2001] (a) Inertia of motion (b) Acceleration of motion (c) Speed of motion (d) Both (b) and (c)

A bird weighs 2 kg and is inside a closed cage of 1 kg. If it starts flying, then what is the weight of the bird and cage assembly [AFMC 1997] (a) 1.5 kg (b) 2.5 kg (c) 3 kg (d) 4 kg

Newton's first law of motion describes the following [MP PMT 1996] (a) Energy (b) Work (c) Inertia (d) Moment of inertia

A particle is moving with a constant speed along a straight line path. A force is not required to [AFMC 2001] (a) Increase its speed (b) Decrease the momentum (c) Change the direction (d) Keep it moving with uniform velocity

At one instant of time a rocket is traveling in outer space at 2500m/s and is exhausting fuel at a rate of 100 kg/s. If the speed of the fuel as it leaves the rocket is 1500m/s, relative to the rocket, the thrust is:

What is the tips in learning physics

8.At what temperature would an intrinsic semiconductor behave like a perfect insulator?

A compact disc player rated as having speed of 8X will operate at an angular speed of about 4,000 rpm. a) What is the angular speed of the disc in the unit of radian/sec? b) By modelling the compact disc (CD) as a thin uniform disc with mass 10 g, an inner radius of 23 mm, and an outer…

In the motion of a projectile freely under gravity, its (a) Total energy is conserved (b) Momentum is conserved (c) Energy and momentum both are conserved (d) None is conserved

If the initial velocity of a projectile be doubled, keeping the angle of projection same, the maximum height reached by it will (a) Remain the same (b) Be doubled (c) Be quadrupled (d) Be halved

A projectile fired with initial velocity u at some angle ? has a range R . If the initial velocity be doubled at the same angle of projection, then the range will be (a) 2R (b) R / 2 (c) R (d) 4R

prove 2nd law of motion with the help of graph

The maximum range of a gun on horizontal terrain is 16 km. If g = 10m / s^2. What must be the muzzle velocity of the shell

The range of a projectile for a given initial velocity is maximum when the angle of projection is o 45 . The range will be minimum, if the angle of projection is

A ball is thrown upwards and it returns to ground describing a parabolic path. Which of the following remains constant [BHU 1999; DPMT 2001; AMU (Engg.) 2000] (a) Kinetic energy of the ball (b) Speed of the ball (c) Horizontal component of velocity (d) Vertical component of velocity

At the top of the trajectory of a projectile, the directions of its velocity and acceleration are (a) Perpendicular to each other (b) Parallel to each other (c) Inclined to each other at an angle of o 45 (d) Antiparallel to each other

An object is thrown along a direction inclined at an angle of 45° with the horizontal direction. The horizontal range of the particle is equal to (a) Vertical height (b) Twice the vertical height (c) Thrice the vertical height (d) Four times the vertical height

A projectile thrown with a speed v at an angle x has a range R on the surface of earth. For same v and x , its range on the surface of moon will be

A ball thrown by a boy is caught by another after 2 sec. some distance away in the same level. If the angle of projection is 30o, the velocity of projection is

A bullet is fired from a cannon with velocity 500 m/s. If the angle of projection is 15° and g = 10m/s². Then the range is

If time of flight of a projectile is 10 seconds. Range is 500 meters. The maximum height attained by it will be

Two bodies are projected with the same velocity. If one is projected at an angle of o 30 and the other at an angle of o 60 to the horizontal, the ratio of the maximum heights reached is

The greatest height to which a man can throw a stone is h . The greatest distance to which he can throw it, will be

A particle covers 50 m distance when projected with an initial speed. On the same surface it will cover a distance, when projected with double the initial speed

The horizontal range is four times the maximum height attained by a projectile. The angle of projection is

A ball is projected with kinetic energy E at an angle of o 45 to the horizontal. At the highest point during its flight, its kinetic energy will be

A particle reaches its highest point when it has covered exactly one half of its horizontal range. The corresponding point on the displacement time graph is characterised by [AIIMS 1995] (a) Negative slope and zero curvature (b) Zero slope and negative curvature (c) Zero slope and positive…

At the top of the trajectory of a projectile, the acceleration is (a) Maximum (b) Minimum (c) Zero (d) g

The horizontal range of a projectile is 4 3 times its maximum height. Its angle of projection will be

Two bodies are thrown up at angles of 45o and 60o, respectively, with the horizontal. If both bodies attain same vertical height, then the ratio of velocities with which these are thrown is

An object is projected at an angle of 45° with the horizontal. The horizontal range and the maximum height reached will be in the ratio. (a) 1 : 2 (b) 2 : 1 (c) 1 : 4 (d) 4 : 1

A football player throws a ball with a velocity of 50 metre/sec at an angle 30 degrees from the horizontal. The ball remains in the air for

The maximum horizontal range of a projectile is 400 m. The maximum value of height attained by it will be [AFMC 2005] (a) 100 m (b) 200 m (c) 400 m (d) 800 m

A cricketer can throw a ball to a maximum horizontal distance of 100 m. With the same effort, he throws the ball vertically upwards. The maximum height attained by the ball is (a) 100 m (b) 80 m (c) 60 m (d) 50 m

A body is thrown with a velocity of 9.8 m/s making an angle of 30o with the horizontal. It will hit the ground after a time

If two bodies are projected at 30o and 60o respectively, with the same velocity, then [JIPMER 2002; CBSE PMT 2000] (a) Their ranges are same (b) Their heights are same (c) Their times of flight are same (d) All of these

A ball thrown by one player reaches the other in 2 sec. the maximum height attained by the ball above the point of projection will be about (a) 10 m (b) 7.5 m (c) 5 m (d) 2.5 m

Which of the following sets of factors will affect the horizontal distance covered by an athlete in a long–jump event [AMU (Engg.) 2001] (a) Speed before he jumps and his weight (b) The direction in which he leaps and the initial speed (c) The force with which he pushes the ground and his…

The magnitude of a given vector with end points (4, – 4, 0) and (– 2, – 2, 0) must be

What do you mean by refractive index

A train locomotive pulls a train with a mass of 1.20 ? 107 kg on level rails. The locomotive exerts a constant force of 7.40 ? 105 N on the train. How much time does it take to increase the speed of the train from rest to 64.0 km/h? (Ignore any resistance force from the rails on the wheels of…

Two alike balls with 15.0 kg mass and 25.0 cm diameter are suspended by two 35.0 cm wires. The entire apparatus is supported by a single 18.0 cm wire. The surfaces of the balls are perfectly smooth. (a) What is the tension in each of the three wires?(b) How hard does each ball push on the other…

The figure below shows a weight which is 60.0N.(a) What is the tension in the diagonal string?(b) Find the magnitudes of the horizontal forces F1 and F2 that must be applied to hold the system inposition shown.

It would be nice to get an explanation for each question. Thank you.

Two identical weights weighing 25.0N are suspended at opposite ends of the rope that passes over a light and frictionless pulley. The pulley is attached to a chain that goes to the ceiling.(a) What is the tension in the rope?(b) What is the tension in the chain?

the passengers in a rollercoaster car feel 50% heavier than their true weight as the car goes through a dip with a 30m radius curvature. What is the car's speed at the bottom of the dip?

A very long frictionless air track is tilted so it is at a 3.00 degree angle from the horizontal. A motion sensor is placed at the low end of the track so that it can measure the motion of a glider as the glider moves along the track. The motion sensor establishes the x-axis: The origin (0.0…

If the spring has a spring rate of 12800 N/m how much would it need to be compressed so the release valve stays closed to a maximum pressure of 470 kPag?

A pressure release valve is made from a spring keeping a disc pushed into a hole in a pressurized tank. The hole has an area of 382 mm2. If the spring has a spring rate of 12800 N/m how much would it need to be compressed so the release valve stays closed to a maximum pressure of 470 kPag?

A car gets 44 miles/gallon on the highway and 20 miles/gallon in the city. Estimate the average miles/gallon for a trip consisting of 60 miles on the highway and 10 miles in the city, then convert this number to SI units (km/L).

boy having a mass equal to 40 kilograms is standing in an elevator. The force felt by the feet of the boy will be greatest when the elevator (a) Stands still (b) Moves downward at a constant velocity of 4 metres/sec (c) Accelerates downward with an acceleration equal to 2 4 metres /…

A vehicle of 100 kg is moving with a velocity of 5 m/sec. To stop it in sec 1/10 , the required force in opposite direction is

In a rocket of mass 1000 kg fuel is consumed at a rate of 40 kg/s. The velocity of the gases ejected from the rocket is 5 X 10 ^4m / s ? . The thrust on the rocket is

An elevator weighing 6000 kg is pulled upward by a cable with an acceleration of 5 m/s². Taking g to be 10 m/s², then the tension in the cable is

A body of mass 4 kg weighs 4.8 kg when suspended in a moving lift. The acceleration of the lift is

Gravels are dropped on a conveyor belt at the rate of 0.5 kg/sec. The extra force required in newtons to keep the belt moving at 2 m/sec is

A block of metal weighing 2 kg is resting on a frictionless plane. It is struck by a jet releasing water at a rate of 1 kg/sec and at a speed of 5 m/sec. The initial acceleration of the block will be

A parachutist of weight ‘w’ strikes the ground with his legs fixed and comes to rest with an upward acceleration of magnitude 3 g. Force exerted on him by ground during landing is (a) w (b) 2w (c) 3w (d) 4w

A particle of mass 0.3 kg is subjected to a force F ? ?kx with k ? 15 N /m. What will be its initial acceleration if it is released from a point 20 cm away from the origin

At a place where the acceleration due to gravity is 10 m/sec^2 a force of 5 kg-wt acts on a body of mass 10 kg initially at rest. The velocity of the body after 4 second is

In doubling the mass and acceleration of the mass, the force acting on the mass with respect to the previous value (a) Decreases to half (b) Remains unchanged (c) Increases two times (d) Increases four times

When 1 N force acts on 1 kg body that is able to move freely, the body receives [CPMT 1971] (a) A speed of 1 m/sec (b) An acceleration of 1 m/sec² (c) An acceleration of 980 cm/sec² (d) An acceleration of 1 cm/sec²

A body of mass 40 gm is moving with a constant velocity of 2 cm/sec on a horizontal frictionless table. The force on the table is (a) 39200 dyne (b) 160 dyne (c) 80 dyne (d) Zero dyne

An object with a mass 10 kg moves at a constant velocity of 10 m/sec. A constant force then acts for 4 second on the object and gives it a speed of 2 m/sec in opposite direction. The acceleration produced in it, is

A force of 5 N acts on a body of weight 9.8 N. What is the acceleration produced in m/sec2 [NCERT 1990] (a) 49.00 (b) 5.00 (c) 1.46 (d) 0.51

A man weighing 80 kg is standing in a trolley weighing 320 kg. The trolley is resting on frictionless horizontal rails. If the man starts walking on the trolley with a speed of 1 m / s, then after 4 sec his displacement relative to the ground will be [(a) 5 m (b) 4.8 m (c) 3.2 m (d) 3.0 m

If the tension in the cable of 1000 kg elevator is 1000 kg weight, the elevator [NCERT 1971] (a) Is accelerating upwards (b) Is accelerating downwards (c) May be at rest or accelerating (d) May be at rest or in uniform motion

A coin is dropped in a lift. It takes time t 1to reach the floor when lift is stationary. It takes time t2 when lift is moving up with constant acceleration. Then relation between t1 and t2 is?

in a lift. If the lift descends with an acceleration equal to the acceleration due to gravity ‘g’, the reading on the spring balance will be [NCERT 1977] (a) 2 kg (b) (4 ? g)kg (c) (2? g)kg (d) Zero

A body of mass 2 kg moving on a horizontal surface with an initial velocity of 4 m/sec comes to rest after 2 sec. If one wants to keep this body moving on the same surface with a velocity of 4 m/sec, the force required is [NCERT 1977] (a) 8 N (b) 4 N (c) Zero (d) 2 N

diwali rocket is ejecting 0.05 kg of gases per second at a velocity of 400 m/sec. The accelerating force on the rocket is [NCERT 1979; DPMT 2001; MP PMT 2004] (a) 20 dynes (b) 20 N (c) 22 dynes (d) 1000 N

An object will continue moving uniformly until (a) The resultant force acting on it begins to decrease (b) The resultant force on it is zero (c) The resultant force is at right angle to its rotation (d) The resultant force on it is increased continuously

A force of 100 N acts on mass of 5 gm for 10 sec. The velocity produced is

Newton's second law gives the measure of [CPMT 1982] (a) Acceleration (b) Force (c) Momentum (d) Angular momentum

If a bullet of mass 5 gm moving with velocity 100 m /sec, penetrates the wooden block upto 6 cm. Then the average force imposed by the bullet on the block is (a) 8300 N (b) 417 N (c) 830 N (d) Zero

person sitting in an open car moving at constant velocity throws a ball vertically up into air. The ball falls [EAMCET (Med.) 1995; MH CET 2003;BCECE 2004] (a) Outside the car (b) In the car ahead of the person (c) In the car to the side of the person (d) Exactly in the hand which threw…

When a bus suddenly takes a turn, the passengers are thrown outwards because of [AFMC 1999; CPMT 2000, 2001] (a) Inertia of motion (b) Acceleration of motion (c) Speed of motion (d) Both (b) and (c)

A bird weighs 2 kg and is inside a closed cage of 1 kg. If it starts flying, then what is the weight of the bird and cage assembly [AFMC 1997] (a) 1.5 kg (b) 2.5 kg (c) 3 kg (d) 4 kg

Newton's first law of motion describes the following [MP PMT 1996] (a) Energy (b) Work (c) Inertia (d) Moment of inertia

A particle is moving with a constant speed along a straight line path. A force is not required to [AFMC 2001] (a) Increase its speed (b) Decrease the momentum (c) Change the direction (d) Keep it moving with uniform velocity

At one instant of time a rocket is traveling in outer space at 2500m/s and is exhausting fuel at a rate of 100 kg/s. If the speed of the fuel as it leaves the rocket is 1500m/s, relative to the rocket, the thrust is:

What is the tips in learning physics

8.At what temperature would an intrinsic semiconductor behave like a perfect insulator?

A compact disc player rated as having speed of 8X will operate at an angular speed of about 4,000 rpm. a) What is the angular speed of the disc in the unit of radian/sec? b) By modelling the compact disc (CD) as a thin uniform disc with mass 10 g, an inner radius of 23 mm, and an outer…

In the motion of a projectile freely under gravity, its (a) Total energy is conserved (b) Momentum is conserved (c) Energy and momentum both are conserved (d) None is conserved

If the initial velocity of a projectile be doubled, keeping the angle of projection same, the maximum height reached by it will (a) Remain the same (b) Be doubled (c) Be quadrupled (d) Be halved

A projectile fired with initial velocity u at some angle ? has a range R . If the initial velocity be doubled at the same angle of projection, then the range will be (a) 2R (b) R / 2 (c) R (d) 4R

prove 2nd law of motion with the help of graph

The maximum range of a gun on horizontal terrain is 16 km. If g = 10m / s^2. What must be the muzzle velocity of the shell

The range of a projectile for a given initial velocity is maximum when the angle of projection is o 45 . The range will be minimum, if the angle of projection is

A ball is thrown upwards and it returns to ground describing a parabolic path. Which of the following remains constant [BHU 1999; DPMT 2001; AMU (Engg.) 2000] (a) Kinetic energy of the ball (b) Speed of the ball (c) Horizontal component of velocity (d) Vertical component of velocity

At the top of the trajectory of a projectile, the directions of its velocity and acceleration are (a) Perpendicular to each other (b) Parallel to each other (c) Inclined to each other at an angle of o 45 (d) Antiparallel to each other

An object is thrown along a direction inclined at an angle of 45° with the horizontal direction. The horizontal range of the particle is equal to (a) Vertical height (b) Twice the vertical height (c) Thrice the vertical height (d) Four times the vertical height

A projectile thrown with a speed v at an angle x has a range R on the surface of earth. For same v and x , its range on the surface of moon will be

A ball thrown by a boy is caught by another after 2 sec. some distance away in the same level. If the angle of projection is 30o, the velocity of projection is

A bullet is fired from a cannon with velocity 500 m/s. If the angle of projection is 15° and g = 10m/s². Then the range is

If time of flight of a projectile is 10 seconds. Range is 500 meters. The maximum height attained by it will be

Two bodies are projected with the same velocity. If one is projected at an angle of o 30 and the other at an angle of o 60 to the horizontal, the ratio of the maximum heights reached is

The greatest height to which a man can throw a stone is h . The greatest distance to which he can throw it, will be

A particle covers 50 m distance when projected with an initial speed. On the same surface it will cover a distance, when projected with double the initial speed

The horizontal range is four times the maximum height attained by a projectile. The angle of projection is

A ball is projected with kinetic energy E at an angle of o 45 to the horizontal. At the highest point during its flight, its kinetic energy will be

A particle reaches its highest point when it has covered exactly one half of its horizontal range. The corresponding point on the displacement time graph is characterised by [AIIMS 1995] (a) Negative slope and zero curvature (b) Zero slope and negative curvature (c) Zero slope and positive…

At the top of the trajectory of a projectile, the acceleration is (a) Maximum (b) Minimum (c) Zero (d) g

The horizontal range of a projectile is 4 3 times its maximum height. Its angle of projection will be

Two bodies are thrown up at angles of 45o and 60o, respectively, with the horizontal. If both bodies attain same vertical height, then the ratio of velocities with which these are thrown is

An object is projected at an angle of 45° with the horizontal. The horizontal range and the maximum height reached will be in the ratio. (a) 1 : 2 (b) 2 : 1 (c) 1 : 4 (d) 4 : 1

A football player throws a ball with a velocity of 50 metre/sec at an angle 30 degrees from the horizontal. The ball remains in the air for

The maximum horizontal range of a projectile is 400 m. The maximum value of height attained by it will be [AFMC 2005] (a) 100 m (b) 200 m (c) 400 m (d) 800 m

A cricketer can throw a ball to a maximum horizontal distance of 100 m. With the same effort, he throws the ball vertically upwards. The maximum height attained by the ball is (a) 100 m (b) 80 m (c) 60 m (d) 50 m

A body is thrown with a velocity of 9.8 m/s making an angle of 30o with the horizontal. It will hit the ground after a time

If two bodies are projected at 30o and 60o respectively, with the same velocity, then [JIPMER 2002; CBSE PMT 2000] (a) Their ranges are same (b) Their heights are same (c) Their times of flight are same (d) All of these

A ball thrown by one player reaches the other in 2 sec. the maximum height attained by the ball above the point of projection will be about (a) 10 m (b) 7.5 m (c) 5 m (d) 2.5 m

Which of the following sets of factors will affect the horizontal distance covered by an athlete in a long–jump event [AMU (Engg.) 2001] (a) Speed before he jumps and his weight (b) The direction in which he leaps and the initial speed (c) The force with which he pushes the ground and his…

The magnitude of a given vector with end points (4, – 4, 0) and (– 2, – 2, 0) must be

What do you mean by refractive index

A train locomotive pulls a train with a mass of 1.20 ? 107 kg on level rails. The locomotive exerts a constant force of 7.40 ? 105 N on the train. How much time does it take to increase the speed of the train from rest to 64.0 km/h? (Ignore any resistance force from the rails on the wheels of…

Two alike balls with 15.0 kg mass and 25.0 cm diameter are suspended by two 35.0 cm wires. The entire apparatus is supported by a single 18.0 cm wire. The surfaces of the balls are perfectly smooth. (a) What is the tension in each of the three wires?(b) How hard does each ball push on the other…

The figure below shows a weight which is 60.0N.(a) What is the tension in the diagonal string?(b) Find the magnitudes of the horizontal forces F1 and F2 that must be applied to hold the system inposition shown.

Two identical weights weighing 25.0N are suspended at opposite ends of the rope that passes over a light and frictionless pulley. The pulley is attached to a chain that goes to the ceiling.(a) What is the tension in the rope?(b) What is the tension in the chain?