Homework Answers
Concept:- units on RHS and LHS should be same and same unit can be added together. We use this fact to find the units, then use the definition of impulse to find the impulse and then we express impulse as change in momentum to find the final speed and direction,
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4) A 20 kg cart is pushed from a force modeled by F in seconds. Assume...
F (N)t 4. A 75 kg cart that is travelling at a constant speed has a...
F (N)t 4. A 75 kg cart that is travelling at a constant speed has a force applied to it which brings the cart to a stop in 15 s. A Force vs. Time graph of this event is shown to the right: a. What impulse was delivered to the cart? b. At what speed was the cart moving when the force was applied? If the applied force was reduced by 1/3 for the duration of the event, how much...
1. A 200 kg crate is pushed across a floor by a force F = 250...
1. A 200 kg crate is pushed across a floor by a force F = 250 newtons at an angle 0 = 53 below horizontal. The floor exerts a 50 newton frictional force on the crate opposing the motion. a. Draw a labeled free body diagram showing the forces acting on the trunk. (+2) b. Below, write Newtons's 2nd Law (F = må) in the horizontal (x) and vertical (v) direction, using the names of the forces from your free...
5. A 0.6 kg ball is dropped with no initial speed from a height of 8...
5. A 0.6 kg ball is dropped with no initial speed from a height of 8 m. The ball bounces off the ground vertically, reaching a height of 7 m. Calculate: (i) The speed of the ball when it hits the ground. (ii) The speed of the ball when it nounces off the ground. (iii) The (magnitude of the) impulse provided by the ground. 6. A 0.2 kg ball hits a bat at 20 m/s and bounces back at 40...
5) Use the picture to the right to answer the following. a) From 0-4 seconds, is...
5) Use the picture to the right to answer the following. a) From 0-4 seconds, is the change in momentum dolta x (m) positive or negative? b) What is the impulse from 0-4 seconds? c) What is the force at t 4 seconds? d) What time is the force zero? e) If the object is 12 kg, what speed is it initially moving if it comes to stop from 0-4 seconds?
10.7 A soccer player deflects a soccer ball by kicking it. Initially the soccer ball (mass 0.40 kg) is moving horiz...
10.7 A soccer player deflects a soccer ball by kicking it. Initially the soccer ball (mass 0.40 kg) is moving horizontally to the left witha speed of 20.0 m/s. The kick causes it to have an initial, post-kick velocity of 30.0 m/s with an angle of 45 upward and to the right. If the time that the player's foot is in contact with the soccer ball is 0.010 seconds find: A. The impulse of the net force The average net...
A 6 kg bowling ball rolling at 5 m/s strikes a stationary 4 kg bowling ball
A 6 kg bowling ball rolling at 5 m/s strikes a stationary 4 kg bowling ball. If ball #1 is moving forward at 2 m/s after the collision, what is the speed and direction of ball #2? What is the impulse of the system? If the collision last for .5 seconds, how much force is exerted?
1.A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a...
1.A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N frictional force. He pushes in a direction 250 below the horizontal. (a) What is the work done on the cart by friction? (b) What is the work done on the cart by the normal force? (c) What is the work done on the cart by the shopper? (4 pts) 2 Calculate the kinetic energies of (a) a 2000.0-kg automobile moving at 100.0...
3. A 20 Kg box, initially at rest, is pushed for 2 meters with a force...
3. A 20 Kg box, initially at rest, is pushed for 2 meters with a force of 50 Newtons. If the frictional force is 30 Newtons, what is the kinetic energy of the box at the end of the 2 meters? Note: this is not a machines problem A see-saw (or a lever) for a playground is 10 meters long. The fulcrum, or pivot point, is placed 2 meters from one end and 8 meters from the other end. What...
1) An object at rest is pushed by a net force represented by the graph above....
1) An object at rest is pushed by a net force represented by the graph above. If the mass is 20kg, how fast is it moving: a) after traveling from 0-6 seconds? b) after traveling from 0-26 seconds? F (N) 20 10 t(s) 10 20
do all please. 1. A 20 Kg cart moving at 10 m/s collides with a 10...
do
all please.
1. A 20 Kg cart moving at 10 m/s collides with a 10 Kg cart moving at 20 m/ s. The two carts stick to each other after the collision. Calculate the final speed of the carts just after the collision if () They were moving in the same direction direction (i.e. thefaster bumped the slower from behind) (ii) They were moving at 90° respect to each other. (ii) They were moving at 30° respect to each...
F (N)t 4. A 75 kg cart that is travelling at a constant speed has a force applied to it which brings the cart to a stop in 15 s. A Force vs. Time graph of this event is shown to the right: a. What impulse was delivered to the cart? b. At what speed was the cart moving when the force was applied? If the applied force was reduced by 1/3 for the duration of the event, how much...
1. A 200 kg crate is pushed across a floor by a force F = 250 newtons at an angle 0 = 53 below horizontal. The floor exerts a 50 newton frictional force on the crate opposing the motion. a. Draw a labeled free body diagram showing the forces acting on the trunk. (+2) b. Below, write Newtons's 2nd Law (F = må) in the horizontal (x) and vertical (v) direction, using the names of the forces from your free...
5) Use the picture to the right to answer the following. a) From 0-4 seconds, is the change in momentum dolta x (m) positive or negative? b) What is the impulse from 0-4 seconds? c) What is the force at t 4 seconds? d) What time is the force zero? e) If the object is 12 kg, what speed is it initially moving if it comes to stop from 0-4 seconds?
10.7 A soccer player deflects a soccer ball by kicking it. Initially the soccer ball (mass 0.40 kg) is moving horizontally to the left witha speed of 20.0 m/s. The kick causes it to have an initial, post-kick velocity of 30.0 m/s with an angle of 45 upward and to the right. If the time that the player's foot is in contact with the soccer ball is 0.010 seconds find: A. The impulse of the net force The average net...
1.A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N frictional force. He pushes in a direction 250 below the horizontal. (a) What is the work done on the cart by friction? (b) What is the work done on the cart by the normal force? (c) What is the work done on the cart by the shopper? (4 pts) 2 Calculate the kinetic energies of (a) a 2000.0-kg automobile moving at 100.0...
3. A 20 Kg box, initially at rest, is pushed for 2 meters with a force of 50 Newtons. If the frictional force is 30 Newtons, what is the kinetic energy of the box at the end of the 2 meters? Note: this is not a machines problem A see-saw (or a lever) for a playground is 10 meters long. The fulcrum, or pivot point, is placed 2 meters from one end and 8 meters from the other end. What...
1) An object at rest is pushed by a net force represented by the graph above. If the mass is 20kg, how fast is it moving: a) after traveling from 0-6 seconds? b) after traveling from 0-26 seconds? F (N) 20 10 t(s) 10 20
do
all please.
1. A 20 Kg cart moving at 10 m/s collides with a 10 Kg cart moving at 20 m/ s. The two carts stick to each other after the collision. Calculate the final speed of the carts just after the collision if () They were moving in the same direction direction (i.e. thefaster bumped the slower from behind) (ii) They were moving at 90° respect to each other. (ii) They were moving at 30° respect to each...
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