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Physics 101 Mechanics Q&A Archive of October 27, 2021

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October 27 of 2021

physics help pls
physics help
5–18. The motor delivers a torque of 50 N # m to the shaft AB. This torque is transmitted to shaft CD using the gears at E and F. Determine the equilibrium torque T on shaft CD and the maximum shear stress in each shaft. The bearings B, C, and D allow free rotation of the shafts.
Free Fall question
An end loader holds 1500kg of sand 2.00m off the ground
QUESTION 23 The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III. The object is never at rest. True False
In a gas turbine cycle with an air preheater, air enters the compressor at a temperature and pressure of 30 ° C and 1.5 bar, and exits the compressor at 220 ° C and 5.2 bar. After passing through the air preheater, it reaches a temperature of 395°C. and leaving the turbine at a temperature of…
A 25-kg box is sliding down an ice-covered hill. When it reaches at point at point A, the box is moving at 11 m/s. Point A is at the bottom of the circular arc that has a radius R = 7.5 m. What is the magnitude of the normal force on the box at point A.
A certain string breaks when it is under 25 N of tension. A boy uses this string to whirl a 2-kg stone in a horizontal circle of radius 3 m. The boy continuously increases the speed of the stone. At approximately what speed will the string break.
A box rests on a flatbed of a truck that is initially travelling at 15 m/s on a level road. The driver applies the brakes and the truck is brought to stop in a distance of 38 m. If the deceleration of the truck is constant, what is the minimum coefficient of friction between the crate and the…
In Fig. 6 a 100 kg block is pushed at a constant speed up the rough 37 degrees ramp by a horizontal force F. The coefficient of kinetic friction between block and surface is 0.15. What is the magnitude of force F?
In Fig. 6 a 100 kg block is pushed at a constant speed up the rough 37 degrees ramp by a horizontal force F. The coefficient of kinetic friction between block and surface is 0.15. What is the magnitude of force F?
1. A boat has a speed of 8 mph in still water attempts to go directly across a river with a current of 3 mph. What is the effective speed of the boat?
Fond the lowest energy of an electron confined to move in a one dimensional potential box of length 1A°
Refer to the position-versus-time graph below to answer the following questions: a. Is the average speed for the time interval between points 1 and 2 greater than, less than, or equal to the average speed for the time interval between points 1 and 3? Explain. (Hint: use the definition of…
A dump truck, whose bed is made of steel, holds an old steel watering trough. The bed of the truck is slowly raised until the trough begins to slide. What is the acceleration of the trough as it slides down the truck bed?
If two wires having resistance R and 2R. Both joined in series and in parallel then ratio of heat generated in this situation, applying the same voltage,
The heat produced by a 100 watt heater in 2 minute will be equal to
The mass of two substances are 4gm and 9gm respectively. If their kinetic energies are same, then the ratio of their momenta will be (a) 4 : 9 (b) 9 : 4 (c) 3 : 2 (d) 2 : 3
If momentum is increased by 20%, then K.E. increases by [AFMC 1997; MP PMT 2004] (a) 44% (b) 55% (c) 66% (d) 77%
Two bodies of masses m and 2m have same momentum. Their respective kinetic energies 1 E and 2 E are in the ratio
4 kg mass and a 1 kg mass are moving with equal kinetic energies. The ratio of the magnitudes of their linear momenta is (a) 1 : 2 (b) 1 : 1 (c) 2 : 1 (d) 4 : 1
If the kinetic energy of a body becomes four times of its initial value, then new momentum will (a) Becomes twice its initial value (b) Become three times its initial value (c) Become four times its initial value (d) Remains constant
Two bodies A and B having masses in the ratio of 3 : 1 possess the same kinetic energy. The ratio of their linear momenta is then
If velocity of a body is twice of previous velocity, then kinetic energy will become
If the kinetic energy of a body increases by 0.1%, the percent increase of its momentum will be [MP PMT 1994]
Three liquids of densities d, 2d and 3d are mixed in equal volumes. Then the density of the mixture is
The kinetic energy of a body of mass 3 kg and momentum 2 Ns is
Two bodies of masses m and 4 m are moving with equal K.E. The ratio of their linear momentums is
A body moving with velocity v has momentum and kinetic energy numerically equal. What is the value of v
A stationary particle explodes into two particles of a masses m 1 and m2 which move in opposite directions with velocities 1 v and . 2 v The ratio of their kinetic energies E1 / E2 is
If pressure at half the depth of a lake is equal to 2/3 pressure at the bottom of the lake then what is the depth of the lake
In a wire of length L, the increase in its length is l. If the length is reduced to half, the increase in its length will be
Increase in length of a wire is 1 mm when suspended by a weight. If the same weight is suspended on a wire of double its length and double its radius, the increase in length will be
The ratio of diameters of two wires of same material is n : 1. The length of wires are 4 m each. On applying the same load, the increase in length of thin wire will be
A non uniform beam is 10.0 m long. One third of the beam has a uniform mass of 50.0 kg. The remaining two thirds of the beam has a uniform mass of 250. kg. Find the center of mass of the beam.
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
An inelastic ball is dropped from a height of 100 m. Due to earth, 20% of its energy is lost. To what height the ball will rise (a) 80 m (b) 40 m (c) 60 m (d) 20 m
The quantities remaining constant in a collision are [MP PET 1997] (a) Momentum, kinetic energy and temperature (b) Momentum and kinetic energy but not temperature (c) Momentum and temperature but not kinetic energy (d) Momentum but neither kinetic energy nor temperature
A tennis ball dropped from a height of 2 m rebounds only 1.5 m after hitting the ground. What fraction of its energy is lost in the impact
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 non uniform beam is 10.0 m long. One third of the beam has a uniform mass of 50.0 kg. The remaining two thirds of the beam has a uniform mass of 250. kg. Find the center of mass of the beam.
You are pulling up a rectangular uniform tray with a bucket of water on one end, and a light paint brush on the other. Where should you tie your rope if you do not want the water to spill?
What is the weight of a loaded bridge if it is supported at each end and the reaction forces at the supports are 385 kN and 415 kN?
56 gram meterstick rests on two supporting blocks One block Is under the meterstick at the 10 cm mark while the other at the 79 cm mark How much weight does the 10 cm block support? Answer newtons
The distance between the front and rear wheels of a truck is 6.75 m. If the front wheels each press on the ground with a 6750 N force, and each rear wheel with a 9950 N force, determine the location of the center of gravity.
A light fixture is suspended from two wires that make angles of 72.0 deg and 65.0 deg with the horizontal. Determine the tensions in the wires if the light fixture has a mass of 2.0 kg
physics help pls
physics help
5–18. The motor delivers a torque of 50 N # m to the shaft AB. This torque is transmitted to shaft CD using the gears at E and F. Determine the equilibrium torque T on shaft CD and the maximum shear stress in each shaft. The bearings B, C, and D allow free rotation of the shafts.
Free Fall question
An end loader holds 1500kg of sand 2.00m off the ground
QUESTION 23 The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III. The object is never at rest. True False
In a gas turbine cycle with an air preheater, air enters the compressor at a temperature and pressure of 30 ° C and 1.5 bar, and exits the compressor at 220 ° C and 5.2 bar. After passing through the air preheater, it reaches a temperature of 395°C. and leaving the turbine at a temperature of…
A 25-kg box is sliding down an ice-covered hill. When it reaches at point at point A, the box is moving at 11 m/s. Point A is at the bottom of the circular arc that has a radius R = 7.5 m. What is the magnitude of the normal force on the box at point A.
A certain string breaks when it is under 25 N of tension. A boy uses this string to whirl a 2-kg stone in a horizontal circle of radius 3 m. The boy continuously increases the speed of the stone. At approximately what speed will the string break.
A box rests on a flatbed of a truck that is initially travelling at 15 m/s on a level road. The driver applies the brakes and the truck is brought to stop in a distance of 38 m. If the deceleration of the truck is constant, what is the minimum coefficient of friction between the crate and the…
In Fig. 6 a 100 kg block is pushed at a constant speed up the rough 37 degrees ramp by a horizontal force F. The coefficient of kinetic friction between block and surface is 0.15. What is the magnitude of force F?
In Fig. 6 a 100 kg block is pushed at a constant speed up the rough 37 degrees ramp by a horizontal force F. The coefficient of kinetic friction between block and surface is 0.15. What is the magnitude of force F?
Fond the lowest energy of an electron confined to move in a one dimensional potential box of length 1A°
Refer to the position-versus-time graph below to answer the following questions: a. Is the average speed for the time interval between points 1 and 2 greater than, less than, or equal to the average speed for the time interval between points 1 and 3? Explain. (Hint: use the definition of…
A dump truck, whose bed is made of steel, holds an old steel watering trough. The bed of the truck is slowly raised until the trough begins to slide. What is the acceleration of the trough as it slides down the truck bed?
If two wires having resistance R and 2R. Both joined in series and in parallel then ratio of heat generated in this situation, applying the same voltage,
The heat produced by a 100 watt heater in 2 minute will be equal to
The mass of two substances are 4gm and 9gm respectively. If their kinetic energies are same, then the ratio of their momenta will be (a) 4 : 9 (b) 9 : 4 (c) 3 : 2 (d) 2 : 3
If momentum is increased by 20%, then K.E. increases by [AFMC 1997; MP PMT 2004] (a) 44% (b) 55% (c) 66% (d) 77%
Two bodies of masses m and 2m have same momentum. Their respective kinetic energies 1 E and 2 E are in the ratio
4 kg mass and a 1 kg mass are moving with equal kinetic energies. The ratio of the magnitudes of their linear momenta is (a) 1 : 2 (b) 1 : 1 (c) 2 : 1 (d) 4 : 1
If the kinetic energy of a body becomes four times of its initial value, then new momentum will (a) Becomes twice its initial value (b) Become three times its initial value (c) Become four times its initial value (d) Remains constant
Two bodies A and B having masses in the ratio of 3 : 1 possess the same kinetic energy. The ratio of their linear momenta is then
If velocity of a body is twice of previous velocity, then kinetic energy will become
If the kinetic energy of a body increases by 0.1%, the percent increase of its momentum will be [MP PMT 1994]
Three liquids of densities d, 2d and 3d are mixed in equal volumes. Then the density of the mixture is
The kinetic energy of a body of mass 3 kg and momentum 2 Ns is
Two bodies of masses m and 4 m are moving with equal K.E. The ratio of their linear momentums is
A body moving with velocity v has momentum and kinetic energy numerically equal. What is the value of v
A stationary particle explodes into two particles of a masses m 1 and m2 which move in opposite directions with velocities 1 v and . 2 v The ratio of their kinetic energies E1 / E2 is
If pressure at half the depth of a lake is equal to 2/3 pressure at the bottom of the lake then what is the depth of the lake
In a wire of length L, the increase in its length is l. If the length is reduced to half, the increase in its length will be
Increase in length of a wire is 1 mm when suspended by a weight. If the same weight is suspended on a wire of double its length and double its radius, the increase in length will be
The ratio of diameters of two wires of same material is n : 1. The length of wires are 4 m each. On applying the same load, the increase in length of thin wire will be
A non uniform beam is 10.0 m long. One third of the beam has a uniform mass of 50.0 kg. The remaining two thirds of the beam has a uniform mass of 250. kg. Find the center of mass of the beam.
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
An inelastic ball is dropped from a height of 100 m. Due to earth, 20% of its energy is lost. To what height the ball will rise (a) 80 m (b) 40 m (c) 60 m (d) 20 m
The quantities remaining constant in a collision are [MP PET 1997] (a) Momentum, kinetic energy and temperature (b) Momentum and kinetic energy but not temperature (c) Momentum and temperature but not kinetic energy (d) Momentum but neither kinetic energy nor temperature
A tennis ball dropped from a height of 2 m rebounds only 1.5 m after hitting the ground. What fraction of its energy is lost in the impact
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 non uniform beam is 10.0 m long. One third of the beam has a uniform mass of 50.0 kg. The remaining two thirds of the beam has a uniform mass of 250. kg. Find the center of mass of the beam.
You are pulling up a rectangular uniform tray with a bucket of water on one end, and a light paint brush on the other. Where should you tie your rope if you do not want the water to spill?
What is the weight of a loaded bridge if it is supported at each end and the reaction forces at the supports are 385 kN and 415 kN?
56 gram meterstick rests on two supporting blocks One block Is under the meterstick at the 10 cm mark while the other at the 79 cm mark How much weight does the 10 cm block support? Answer newtons
The distance between the front and rear wheels of a truck is 6.75 m. If the front wheels each press on the ground with a 6750 N force, and each rear wheel with a 9950 N force, determine the location of the center of gravity.
A light fixture is suspended from two wires that make angles of 72.0 deg and 65.0 deg with the horizontal. Determine the tensions in the wires if the light fixture has a mass of 2.0 kg