PHYS 131 - MOMENTUM QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY
GRADED A+||BRAND NEW
momentum Ans✓✓✓ = mass x velocity
Force = (change in momentum) / (change in time)
The cart's change of momentum Δ p x is:
(A) -10 kg m/s
(B) 0 kg m/s
(C) 10 kg m/s
(D) 30 kg m/s Ans✓✓✓ (D) 30 kg m/s
A force pushes the cart for 1 s, starting from rest. To achieve the same
speed with a force half as big, the force would need to push for:
(A) 0.50 s
(B) 1.0 s
(C) 2.0 s
(D) 4.0 s Ans✓✓✓ (C) 2.0 s
Two fan carts are on opposite sides of a table with their fans pointed in
the same direction. Cart A is twice as heavy as cart B. When the fans are
on, they cause the air to exert a constant force of the cart independent of
its mass. Assume friction can be neglected.The fans are set with a timer
so that after they are switched on, they stay on for a fixed length of time,
Δt, and then are turned off.
, Just after the fans are turned off, which is true about the momenta of the
two carts?
(A) momentum of cart A > Momentum of cart B
(B) momentum of cart A < Momentum of cart B
(C) momentum of cart A = Momentum of cart B Ans✓✓✓ (C)
momentum of cart A = Momentum of cart B
A molecular cluster at rest collides with an atom. As a result, the atom
becomes strongly bound to the cluster and an identical atom (from a
different part of the molecule)gets shot off at a much higher speed. What
can you say about the motion of the re-formed cluster after the collision?
(A) It will be stationary
(B) It will move to the left
(C) It will move to the right Ans✓✓✓ (C) It will move to the right
Which ball has the best chance to knock the block over?
(A) A superball
(B) A clay ball
(C) both
(D) neither Ans✓✓✓ (A) A superball
A 2.0 kg object moving to the right with speed of 0.50 m/s experiences
the force shown. What are the object's speed and direction after the force
ends?
(A) At rest
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY
GRADED A+||BRAND NEW
momentum Ans✓✓✓ = mass x velocity
Force = (change in momentum) / (change in time)
The cart's change of momentum Δ p x is:
(A) -10 kg m/s
(B) 0 kg m/s
(C) 10 kg m/s
(D) 30 kg m/s Ans✓✓✓ (D) 30 kg m/s
A force pushes the cart for 1 s, starting from rest. To achieve the same
speed with a force half as big, the force would need to push for:
(A) 0.50 s
(B) 1.0 s
(C) 2.0 s
(D) 4.0 s Ans✓✓✓ (C) 2.0 s
Two fan carts are on opposite sides of a table with their fans pointed in
the same direction. Cart A is twice as heavy as cart B. When the fans are
on, they cause the air to exert a constant force of the cart independent of
its mass. Assume friction can be neglected.The fans are set with a timer
so that after they are switched on, they stay on for a fixed length of time,
Δt, and then are turned off.
, Just after the fans are turned off, which is true about the momenta of the
two carts?
(A) momentum of cart A > Momentum of cart B
(B) momentum of cart A < Momentum of cart B
(C) momentum of cart A = Momentum of cart B Ans✓✓✓ (C)
momentum of cart A = Momentum of cart B
A molecular cluster at rest collides with an atom. As a result, the atom
becomes strongly bound to the cluster and an identical atom (from a
different part of the molecule)gets shot off at a much higher speed. What
can you say about the motion of the re-formed cluster after the collision?
(A) It will be stationary
(B) It will move to the left
(C) It will move to the right Ans✓✓✓ (C) It will move to the right
Which ball has the best chance to knock the block over?
(A) A superball
(B) A clay ball
(C) both
(D) neither Ans✓✓✓ (A) A superball
A 2.0 kg object moving to the right with speed of 0.50 m/s experiences
the force shown. What are the object's speed and direction after the force
ends?
(A) At rest
