AP Physics C Quiz #2 - Mechanics
Free Test Online
AP Physics C
AP Mechanics Practice 1
AP Mechanics Practice 2
AP Mechanics Practice 3
AP Electricity Practice 1
AP Electricity Practice 2
AP Free Response 1
AP Free Response 2
AP Physics C online lectures
from Educator.com
Copyright 2010
Free Test Online
Question 1: A 200W electric motor EM shown in the figure below is used to pull a mass m = 20kg to a height h = 5m. How long does it take to motor to do this?
2 seconds
2.5 seconds
3.5 seconds
5 seconds
7.5 seconds
Question 2: Two objects of masses 10kg and 20kg have velocities v
1
= 20m/s and v
2
= 10m/s, on a collison course, as shown below. If 1500J of kinetic energy is lost in the plastic collision and the objects move on a frictionless surface, what is the momentum of the two objects after the plastic collision?
100 kg m/s
150 kg m/s
200 kg m/s
250 kg m/s
300 kg m/s
Question 3: The momentum of an object is given by p(t) = 2t
2
+ 5t. What is the force acting on the object at t = 1s?
5 Newtons
7 Newtons
9 Newtons
10 Newtons
14 Newtons
Question 4: A flat metalic piece of uniform density has a shape and dimensions shown below. A circle of 5cm diameter is cut out of a 100 cm
2
square. The center of mass for the piece of metal is located at:
x = 6.51cm and y = 5cm
x = 5.61cm and y = 5cm
x = 5cm and y = 5cm
x = 5cm and y = 5.61cm
x = 5cm and y = 6.51cm
Question 5: A rod of length l = 1m has a mass density that changes with position x, ρ(x) = x + 1. The center of mass of the rod is at:
x = 1/3 m
x = 4/9 m
x = 1/2 m
x = 5/9 m
x = 2/3 m
Question 6: A rigid board of mass M and moment of inertia I is free to rotate about a hinge and is released from rest when it is in a horizontal position as shown below. What is the angular acceleration if four forces, all of magnitude F, are applied to the bar?
4Fd/I
4FI/d
Fd/4I
4d/FI
4F/I
Question 7: A cylinder with moment of inertia I = 10 kg·m
2
is free to rotate about its symetry axis. The cylinder starts from rest at time t = 0 seconds and accelerates with an angular acceleration of 0.2 rad/s
2
. What is the cylinder's angular momentum after t = 10s?
L = 10 kg m m/s
L = 20 kg m m/s
L = 25 kg m m/s
L = 35 kg m m/s
L = 40 kg m m/s
Press the Submit button to see the results.