Physics Final Exam

mgh (note: the car reaches a plateau again)

A car of weigh mg is driven up the incline of an angle theta until it reaches a heigh h above the earth surface. What is the gravitational potential energy with respect to the earths surface

Decreased by the factor of sqrt2

A centripetal force F acts on an eraser moving at a constant speed 'v' in a horizontal circle of radius r. If the same force is maintained and the radius is halved, what happens to the speed of the eraser?

g

A certain planet has three times the radius of earth and nine times the mass. How does the acceleration of gravity at the surface of this planet compare to the acceleration of gravity on the surface of earth?

The fireman continues to descend, but with a constant speed

A fireman is sliding down a fire pole. As he speeds up, he tightens his grip on the pole, thus increasing the vertical frictional force that the pole exerts on the fireman. When the force on his hands equals his weight, what happens to the fireman?

Remains the same

A man turns with an angular velocity on a rotating table, holding two equal masses at arms' length. If he decides to drop the two masses without moving arms what will happen to his angular velocity

Amplitude

A periodic wave is produced on a stretched string. Which one of the following properties is NOT related to the speed of the wave?

Halves

A railroad car collides with and sticks to an identical railroad car that is initially at rest. After the collision, the kinetic energy of the system

WB = 2WA

Carts A and B have equal masses and travel equal distances on straight frictionless tracks while a constant force F is applied to A, and a constant force 2F is applied to B. The relative amounts of work done by two forces are related by

Both receive equal impulse

In a collision between two unequal masses, which mass receives the greater magnitude of impulse?

Spreads out

In a double-slit experiment, when the wavelength of the light is increased, the interference pattern?

300

Light having a wavelength in vacuum of 600 nm enters a liquid of refractive index of 2. In this liquid what is the wavelength of light?

The period of A is shorter than that of B

Sound A has a high pitch and sound B has a low pitch. What is true about these pitches?

Acceleration must be positive

Suppose that a car traveling west (-x direction) begins to slow down as it approaches a traffic light. What is concerning the acceleration?

Widen the slit

The diffraction pattern in the figure arises from a single slit. If we would like to make the central bright spot NARROWER (sharpen the spot), what should we do with the slit width?

Dragged by a force at an angle above the floor

The frictional force of the floor is the least when the suitcase is?

less than or equal to the magnitude of the vector

The magnitude of a component of a vector must be

Ball B is in the air for a longer time than ball A

Two balls projected at different times so they don't collide, follow projectile motion A and B as shown the figure. What is true?

The stones strike the ground at different times but equal speeds

Two stones are thrown with same initial speed at the same time from the roof of a building. One stone is thrown at 30 degrees above the horizontal and the other one is thrown horizontally.

Block is being constantly accelerated downward at 9.8m/s^2

What has to be true for a 10kg block to be considered weightless

2Vcm

When a center of a wheel has a linear velocity of Vcm, relative to ground. The velocity relative to ground of point P at the top of the wheel (when the wheel is rolling) is?

v*sqrt(2)

When a certain string is under tension T, the speed of the wave in the string is v. What will be the speed of the wave in the the string if the tension is increased to 2T without changing any other factors.

-2ukmgd

When a crate of mass m is dragged along a distance d on a surface with coefficient of kinetic friction u, and dragged back along the same path to its original position. The work done by friction is

Only its speed and wavelength change

When a light wave enters into a medium of different refractive index

Equal in magnitude to the friction force exerted on the table by the student

When a student stands on a rotating table, the friction force exerted on the student by the table is

Only when no net torque acts on the system

When is the angular momentum of a system constant?

The work done is negative on the way up and positive not he way down

You throw a baseball straight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while the it goes down

Double mass, or double spring constant

An object is attached to an ideal spring executes simple harmonic motion. If you want to double its total energy, you could?

Changing acceleration

An object which has a constant non zero velocity cannot have?

Be cut in half

An organ pope with a fundamental frequency f is open at both ends. If one end is closed off, the fundamental frequency will?

Not enough information (if no change in diameter then pressure decreases, but diameter)

As water flows from a low elevation to high elevation through a pipe that changes in diameter

Downward (fingers of the hand)

As you are leaving a building, the door opens outward. If the hinges on the door are on your right, what is the direction of angular velocity of the door as you open it