What formula would you use to find the moment of inertia of a baton with equal weight on each end which make the bar mass negligible?
What is I = mr^2 for each end of the baton mass? This is the same as a hoop with a radius of r.
100
Define the impulse - momentum theorem in equation form.
What is Impulse = F* delta t = pf- pi
100
If a bicycle wheel is rotating at a constant velocity, then the angular acceleration must be ______________.
What is zero?
100
The scientist that developed the law stating that the paths of the planets are ellipses with the Sun at one focus?
Who is Kepler?
200
Measuring the ratio of the circumference of a circle to it's radius, defined as 1/(2pi).
What is radian?
200
The location on a rod with the lowest moment of inertia, end or center.
What is at the center of a rod?
200
How you find the magnitude of the impulse when looking at a curve on a force-time graph.
What is the area under the curve?
200
The term describing the point at which an object moves in the same way as a point particle.
What is center of mass?
200
What English scientist developed equipment to measure the gravitational force between two objects?
Who was Henry Cavendish?
300
The average angular velocity of an object is found by what equation?
What is omega = angular displacement (delta theta) divided by the time required to make the rotation (delta t)
300
Find the moment of inertia of a pool ball with a mass of .5kg and a radius of .2 m?
What is .008 kg-m^2?
(2/5) * .5 * .2^2
300
Two requirements of a system required for the law of conservation of momentum?
What are closed and isolated?
300
The lowest center of mass is located on a car or SUV.
What is a car?
300
When the moon is farthest from this earth, this type of tide occurs.
What is low tide?
400
The relationship between linear and angular velocity as described by an equation.
What is v = r*omega?
400
The moment of inertia of a 10kg see-saw that is .3 m wide and 3 m long without anyone on it.
What is 7.6 kg-m^2?
1/12*10*[.3^2 + 3^2] = 7.6 kg-m^2
400
A compact car, with mass of 725 kg, is moving at velocity of 32 m/s toward the east. Find the direction and magnitude of momentum.
What is 23,200 kg-m/s in the eastward direction?
400
The apparent force that seems to deflect a moving object from it's path and is observed only in rotating frames of reference.
What is the coriolis force?
400
Speed is an example of this type of quantity.
What is scalar?
500
A bolt on a care engine must be tightened with a torque of 35 N-m. You use a .25 m long wrench and pull the end of the wrench at an angle of 75 degrees. How much force must you exert?
What is 140 N?
F = torque / [r * sin(theta)] = 35 / [.25 * sin 75]
500
The moment of inertia through the end of a long rod with a mass of 2 kg, length of .5 meters with a .25 kg ball attached at the far end.
What is 0.30 kg-m^2
I (rod) = 1/3*2*.5^2 = .17 kg-m^2
I (ball) = .25 * .5^2 = .13 kg-m^2
I (total) = .17 + .13 = 0.3 kg-m^2
500
The magnitude of force exerted on a 2.45 kg wagon when over a period of 6 seconds the speed of the wagon increases from 1.5 m/s to 3.55 m/s.
What is 0.84 N?
pi = m*vi = 2.45 * 1.5 = 3.68 (initial momentum)
pf = m * vf = 2.45 * 3.55 = 8.70 (final momentum)
Impulse = pf - pi = 8.70 - 3.68 = 5.02
F = impulse / delta t = 5.02 / 6 = 0.84 N
500
An ice skater spins with his arm outstretched. When he pulls his arms in and raises them above his head, he spins much faster than before. The cause of his angular velocity increasing is from...
What is decreased moment of inertia causing his angular velocity to increase?
500
The term that describes a regular, repeating path that one object in space takes around another one.