If we knew what we were doing, it wouldn't be called research, would it? - Albert Einstein
Genius is 99 percent perspiration and 1 percent inspiration. - Thomas Edison
Kinematics Problem: A placekicker must kick a football from a point 36.0 m from the goa
For the following situation, give an expression for conservation of energy: a) in terms of Ui, Uf, Ki, Kf, fk, and d. b) in terms of m, fk and the given numbers.
yf = 0.5m 35
vi = 5m/s
For the following situation, would the ball travel as high if it were
A giant, 1m2 suction cup is stuck to the ceiling. About how many 100kg (220lb) people will it hold? a) 1 b) 2 c) 5 d) 10 e) 50 f) 100 g) 1000
A container is filled with oil and fitted on both ends with pistons. The area of the left piston is 10 mm2; that
A truck and a car are moving along the road with equal momentum. Each driver hits the brakes. If both vehicles stop in the same time, which brakes applied the greater force? a) The truck's brakes. b) The car's brakes. c) The forces were equal.
A ball is m
Two objects collide. Under what conditions are the final velocities both zero?
You are sitting at your desk and wish to close the door by throwing something at it. You have a bouncy ball and a sticky lump of clay. If both are the same mass, which should y
Rotational coordinates are:
s = r
Therefore:
vt = r
at = r
OLD EQUATIONS vf = vi + at xf = xi + vit + 0.5at2 vf2 = vi2 + 2a(xf xi) xf = xi + 0.5(vi + vf)t
NEW EQUATIONS f = i + t f = i + it + 0.5t2 f2 = i2 + 2( f i) f = i +0.5( i + f)t
A vehicle is travel
A 1,000kg vehicle is traveling counterclockwise in a circle (r=40m) at a constant speed of 10m/s. What is the vehicle's moment of inertia?
Three more cars are added and the radius of the track is doubled. What happens to the total moment of inertia?
Two o
You are trying to turn a rusty bolt. Which of the following would work the best?
A B
F C D
F
F F
You are riding an exercise bike. If a frictional force F is applied to the rim of the wheel, what force must you apply to the pedal in order to turn the wheel
A ball rotates around on a string. If the string length were doubled and the velocity held constant, what would happen to the angular momentum?
A solid disk and a hoop of equal radius both rotate around at the same frequency. If the weigh the same amount,
A wheel is free to rotate on an axle that has a built-in motor. If the axle is placed on the ice and the motor begins to turn the wheel, what happens to the axle? a) It begins to turn the same direction, with the same speed. b) It begins to turn the oppos
A wrench is used to attempt to turn a bolt. The bolt has a radius of 1cm and the wrench is 30cm long. a) Draw the extended force diagram for the bolt/wrench system. b) Write out the expression that would determine the magnitude of the frictional force nec
Tacoma Narrows Bridge http:/www.youtube.com/watch?v=Ce-PQqkIXe0&feature=related
A mass on a spring oscillates at a frequency of 2 Hz. If the mass is doubled, what is the new frequency of oscillation? a) 1 Hz b) 1.4 Hz c) 2 Hz d) 2.8Hz e) 4 Hz f) None of t
y
Wave Pulse
x
y
Wave Pulse
X-vt
X
x
A piston at the end of a pipe moves in and out. What type of wave does the piston produce in the pipe? a) transverse b) longitudinal c) combonation
A wave moves along a string at 5m/s. How fast does a molecule in the s
If a tree falls in the forest and there's no one there to hear it, does it make a sound? a) Yes b) No
A particular molecule in a sound wave is traveling at its maximum speed. What can be said about the pressure on this molecule? a) It is at a maximum. b)
What happens to the frequency of an organ pipe if you saw off a bit of the end of the pipe?
A pipe closed at one end and open at other will give a. All even harmonics b. All odd harmonics c. All the harmonics d. None of the harmonics
Which one of the foll
A non-bouncy object is dropped from the top of a 100m building. If the object comes to rest upon hitting the ground, does this defy conservation of energy? Explain.
A 0.5 kg toy sinks into the lake. If the buoyant and viscous forces of the water on the to
A snowball at the top of a small mountain breaks in half. One half rolls down the left side and the other down the right side, as shown below. Given that the mountain is 45m tall, determine the change in potential energy of each snowball.
A ball moves hor
If two displacement vectors of 6 meters and 8 meters (with varying directions) are added together, then the resultant could range anywhere between _ meters and _ meters. a. 0, 48 b. 1.33, 48 c. 0, 14 d. 2, 14 e. No such prediction can be made. f. A predic
The door shown in A (from the top view) has a dart sticking straight out of it. The vector representing the position of the dart's tail is:
^ T = 3.0n
What vector represents the position of the dart's tail in B?
A
B
Given the vectors shown below, write o
Below is a graph of position vs. time.
x (m)
B A C
t (s)
D
x (m)
At which point am I nearest the origin?
B A C
t (s)
D
x (m)
At which point is my speed the greatest?
B A C
t (s)
D
x (m)
At which point is my speed the least?
B A C
t (s)
D
What is average v
A soccer ball rolls slowly across the road and down a hill as shown below.
Which of the following sketches of ax vs. t is a reasonable representation of the horizontal acceleration of the ball as a function of time?
(1)
(2)
(3)
(4)
(5) None of the above.
A football is kicked into the air at an angle of 45 degrees with the horizontal. At the very top of the ball's path, its velocity is _. a. entirely vertical b. entirely horizontal c. both vertical and horizontal d. zero e. not enough information given to
A vehicle is traveling counterclockwise in a circle at a constant speed. At the moment shown below, is the vehicle accelerating? If not, explain. If so, draw the acceleration vector.
A vehicle is traveling counterclockwise in a circle. At the moment shown
Big Bubba has a mass of 100 kg on the earth. What is Big Bubba's mass on the moon where the force of gravity is approximately 1/6-th that of Earth's?
Little Billie weighs 360 N on Earth. What is Little Billie's mass on the moon where the force of gravity
Three pictures of equal weight (20 N) are hung by wires in three different orientations. In which orientation are the wires least likely to break?
A car is moving toward the right. Then a force is applied causing the force diagram to look as shown below.
A ball swings in a horizontal circle at constant speed, as shown. Draw a force diagram for the ball from the top view. (You may neglect gravity.)
Top View
A 1.5 kg ball swings in a horizontal circle at a constant speed of 6.0 m/s, as shown. If the string
Which of the force diagrams below represents an object moving counterclockwise and slowing down?
You are at the fair in the vertical Loop of Death. When you are at the top of the ride, the frictional force of the track on the cart is: a) ftrack on cart <
Draw accurate (proportionate) force diagrams for each of the masses below.
5 kg
8 kg
Write out Newton's 2nd Law for each of the masses below.
5 kg
8 kg
Consider the movable pulley to be part of the 5 kg mass. Draw accurate force diagrams for each of the m
The crate below slides down a ramp with a rough surface. Draw a force diagram for the crate.
The 10kg crate below slides down a ramp with a rough surface, with k=0.25. Find the coefficient of kinetic friction.
The 10kg crate below slides down a ramp with