Please answer all the questions. Circle the correct answers and show all your wo
ID: 1620198 • Letter: P
Question
Please answer all the questions. Circle the correct answers and show all your work where applicable. 1) If we increase the mass of a pendulum, its period will A) Increase B) Decrease C) Stay the same DNone of the above 2) When no Kinetic Energy is lost, the collision is said to bem B perfectly elast C) elastic D)both A and B A) Inelastic 3) Inelastic collision is the collision in which kinetic energy ism C) increased D) decreased A) Not conserved B) conserved 4) Elastic collision is the collision in which kinetic energy is D) increased B) Decreased C) conserved A) Not conserved 5) If we increase the length of a pendulum, its period will A) Increase B) Decrease C) Stay the same D)None of the above 6) What is the acceleration of a 200g object if the magnitude of the force acting on it is 2N. Recall: F ma B) 10m/s? C) 400m/s? A) 0.01 m/s2 D) none of the above 7) Calculate the Gravitational Potential Energy of a 10 kg ball at a height of 2m. B) 200 J A) 20 J C) 50 J D) 10 J Recall: GPE mgh (g 10m/s2) 8) A 5kg cart moving at 1 m/s collides with a 1kg cart moving in the opposite direction at 2 m/s. They stick together after the collision. What will be the speed of the two carts? (Assume no external forces present). A) 9 m/s B) 0.5 m/s C) 1.17 m/s D) 2 m/s Recall: mlv1 m2v2 (m1 m2)y Hint: one of your initial velocities is negative because they are moving opposite to each otherExplanation / Answer
1.
T = 2*pi*sqrt (L/g)
time period doesn't depend on mass of pendulum
Correct option is C.
2.
When no KE lost, then collision is elastic
Correct option is C.
3.
KE in inelastic collision is decreased, because some energy is lost during collision.
Correct option is D.
4.
In elastic collision KE in conserved.
Correct option is C
5.
T = 2*pi*sqrt (L/g)
T is directly proportional to sqrt L
So when L is increased, T is also increased.
Correct option is A.
6.
a = F/m
a = 2/0.2 = 10 m/sec^2
Correct option is B.