• Home
  • Ask directory
  • Physics 101 Mechanics
  • November 2021
  • 19

Physics 101 Mechanics Q&A Archive of November 19, 2021

Select Question

November 19 of 2021

An object is being held against a wall, initially at rest. The coefficient of friction is 0.6. The object has a mass of 2 kg and you are holding it with a force of 30N against the wall. How long will the object take to slide down 1m (vi = 0 m/s)?
A pump that is moving water up a tower has a power rating of 400W. How long would it take a molecule of water to travel the height of the tower If it is 91% efficient, and it is moving 80L of water up a height of 20m with a constant velocity?
A spring has a K value of 100 N/m. A 100g mass is dropped from a height of 20 cm unto an uncompressed spring. How much will the spring compress?
A ball falls off a 10 m ledge and hits the ground with a velocity of 10 m/s. What is the work done by friction? (5).....Mass of ball is 10 kg
A spring has a K value of 100 N/m. A 100g mass is dropped from a height of 20 cm unto an uncompressed spring. How much will the spring compress?
A person is pushing a lawnmower at an angle of 45 degrees with a force of 15 N. If the lawnmower has a mass of 6 kg and has a coefficient of friction of 0.1, what is the gain in kinetic energy of the lawnmower after 10 seconds?
67. You have a summer job at your university’s zoology department, where you’ll be working with an animal behavior expert. She’s assigned you to study videos of different animals leaping into the air. Your task is to compare their power outputs as they jump. You’ll have the mass m of each…
A hockey puck is give an initial speed of 14m/s .If it come to rest in 56m,what is the coefficient of kinetic friction?
if a person is 5'11 and they drop a bouncy ball from that height, how long will it take for the ball to hit the ground
a child catches a ball 3.0s after throwing it vertically upward. with what speed did he throw it, and what heigh did it reach
which one of these motions is not at constant acceleration, (1) a rock falling from a cliff, (2) an elevator moving from the second floor to the fifth floor making stops along the way, (3) a dish resting on a table
as a freely falling object speed up, what is happening to its acceleration due to gravity . does it increase, decrease, or stay the same
a baseball is hit nearly straight up into the air with a speed of 22m/s . how high does it go. assuming it was caught at the same height it was hit, how long is it in the air
a baseball player hits a foul ball straight up into the air. it leaves the bat with a speed of 120km/h. in the absence of air resistance, how fast will the ball be traveling when the catcher catcher it
a coin is tossed in the air at the same time a pebble is dropped. compare the acceleration of the two objects ( which is larger)
a coin is tossed in the air at the same time a pebble is dropped. compare the acceleration of the two oblects
king kong fell straight down from the top of the empire state building (380 m high) , how long did it take him to hit the ground
if a car rolls gently off a vertical cliff, how long does it take to it to reach 24m/s
Conduct the following analysis for 2 full revolutions of the crankshaft for the 3-cylinder radial engine shown with dimensions on the following pages: 1) The velocity and acceleration of each piston in the xy-plane with respect to the angle of crank #1. 2) Develop a lumped parameter model of…
One way to estimate muscle mass is to determine a person’s density. You fill a large container with fresh water (of density 1000 kg/m3). Standing on a force plate outside of the water, your classmate weighs 550 N. She empties her lungs as much as possible and is then completely immersed in…
Two crates, one with mass 4.00 kg and the other with mass 6.00 kg, sit on the frictionless surface of a frozen pond, connected by a light rope (Fig. P4.37). A woman wearing golf shoes (for traction) pulls horizon tally on the 6.00 kg crate with a force F that gives the crate an acceleration of…
3) A student with mass 45 kg jumps off a high diving board. Using 6.5X1024 kg for the mass of the earth, what is the acceleration of the earth toward her as she accelerates toward the earth with an acceleration of 9.8 ms-2 . Assume that the net force on the earth is the force of gravity…
A ball of mass m, at one end of a string of length L, rotates in a vertical circle just fast enough to prevent the string from going slack at the top of the circle. Assuming mechanical energy is conserved, the speed of the ball at the bottom of the circle is
When a particle moves from f to i and from j to i along the paths shown in the figure, and in the indicated directions, a conservative force F does the indicated amounts of work on it. How much work is done on the particle by F when the particle moves directly from f to j?
Three charges are located at the points (0,0,0), (2,0,0) and (1,1,0) with the points indicated being in centimetres. Up and right are positive. The charges along the x-axis have 2nC of charge each and the remaining charge is -1nC. A -2nC is placed at a point T, located at (1,2,0). if the charge…
A body of mass m is retarded by a force F_v=-Cv^2, where C is a constant and v is its speed. Find the time required for it to travel distance D if it is initially moving with speed v_0.
a river 4miles wide is flowing at a rate of 2miles . the minimum time taken by a boat to cross the river with a speed 4 miles per hour in still water is approximately
a river 4miles wide is flowing at a rate of 2miles . the minimum time taken by a boat to cross the river with a speed 4 miles per hour in still water is approximately
what is the number of moles in 40gm Nacl
find number of moles in 10gm of NaOH
The velocity of light is maximum in a medium of (A) diamond (B) water (C) glass (D) vacuum
The uniform boom shown below weighs 748 N, and the object hanging from its right end weighs 376 N. The boom is supported by a light cable and by a hinge at the wall.
What is the net moment about the elbow caused by all forces in the diagram? The biceps has a moment arm of 6.38 cm with the elbow fulcrum point, and pulls with 576 N of force?at a 75.1 degree angle with the forearm, creating a stabilizing joint reaction force. The?dumbell?has a mass of 17.3 kg…
An object is being held against a wall, initially at rest. The coefficient of friction is 0.6. The object has a mass of 2 kg and you are holding it with a force of 30N against the wall. How long will the object take to slide down 1m (vi = 0 m/s)?
A pump that is moving water up a tower has a power rating of 400W. How long would it take a molecule of water to travel the height of the tower If it is 91% efficient, and it is moving 80L of water up a height of 20m with a constant velocity?
A spring has a K value of 100 N/m. A 100g mass is dropped from a height of 20 cm unto an uncompressed spring. How much will the spring compress?
A ball falls off a 10 m ledge and hits the ground with a velocity of 10 m/s. What is the work done by friction? (5).....Mass of ball is 10 kg
A spring has a K value of 100 N/m. A 100g mass is dropped from a height of 20 cm unto an uncompressed spring. How much will the spring compress?
A person is pushing a lawnmower at an angle of 45 degrees with a force of 15 N. If the lawnmower has a mass of 6 kg and has a coefficient of friction of 0.1, what is the gain in kinetic energy of the lawnmower after 10 seconds?
67. You have a summer job at your university’s zoology department, where you’ll be working with an animal behavior expert. She’s assigned you to study videos of different animals leaping into the air. Your task is to compare their power outputs as they jump. You’ll have the mass m of each…
A hockey puck is give an initial speed of 14m/s .If it come to rest in 56m,what is the coefficient of kinetic friction?
if a person is 5'11 and they drop a bouncy ball from that height, how long will it take for the ball to hit the ground
a child catches a ball 3.0s after throwing it vertically upward. with what speed did he throw it, and what heigh did it reach
which one of these motions is not at constant acceleration, (1) a rock falling from a cliff, (2) an elevator moving from the second floor to the fifth floor making stops along the way, (3) a dish resting on a table
a baseball is hit nearly straight up into the air with a speed of 22m/s . how high does it go. assuming it was caught at the same height it was hit, how long is it in the air
a coin is tossed in the air at the same time a pebble is dropped. compare the acceleration of the two objects ( which is larger)
a coin is tossed in the air at the same time a pebble is dropped. compare the acceleration of the two oblects
king kong fell straight down from the top of the empire state building (380 m high) , how long did it take him to hit the ground
if a car rolls gently off a vertical cliff, how long does it take to it to reach 24m/s
Conduct the following analysis for 2 full revolutions of the crankshaft for the 3-cylinder radial engine shown with dimensions on the following pages: 1) The velocity and acceleration of each piston in the xy-plane with respect to the angle of crank #1. 2) Develop a lumped parameter model of…
One way to estimate muscle mass is to determine a person’s density. You fill a large container with fresh water (of density 1000 kg/m3). Standing on a force plate outside of the water, your classmate weighs 550 N. She empties her lungs as much as possible and is then completely immersed in…
Two crates, one with mass 4.00 kg and the other with mass 6.00 kg, sit on the frictionless surface of a frozen pond, connected by a light rope (Fig. P4.37). A woman wearing golf shoes (for traction) pulls horizon tally on the 6.00 kg crate with a force F that gives the crate an acceleration of…
A ball of mass m, at one end of a string of length L, rotates in a vertical circle just fast enough to prevent the string from going slack at the top of the circle. Assuming mechanical energy is conserved, the speed of the ball at the bottom of the circle is
When a particle moves from f to i and from j to i along the paths shown in the figure, and in the indicated directions, a conservative force F does the indicated amounts of work on it. How much work is done on the particle by F when the particle moves directly from f to j?
a river 4miles wide is flowing at a rate of 2miles . the minimum time taken by a boat to cross the river with a speed 4 miles per hour in still water is approximately
a river 4miles wide is flowing at a rate of 2miles . the minimum time taken by a boat to cross the river with a speed 4 miles per hour in still water is approximately
what is the number of moles in 40gm Nacl
find number of moles in 10gm of NaOH
The velocity of light is maximum in a medium of (A) diamond (B) water (C) glass (D) vacuum
The uniform boom shown below weighs 748 N, and the object hanging from its right end weighs 376 N. The boom is supported by a light cable and by a hinge at the wall.
What is the net moment about the elbow caused by all forces in the diagram? The biceps has a moment arm of 6.38 cm with the elbow fulcrum point, and pulls with 576 N of force?at a 75.1 degree angle with the forearm, creating a stabilizing joint reaction force. The?dumbell?has a mass of 17.3 kg…