PHYS 1000
Spring 2015
Name:_______________________________
Final Exam
April 28, 2015
INSTRUCTIONS: a) No books, notes, or other such materials are permitted. b) NO CALCULATORS OR MOBILE PHONES ARE PERMITTED!!! c) There is only one correct answer for each question. However, if you feel that more than one answer is correct then you should choose the one you feel is most correct.
EACH QUESTION IS WORTH 5 POINTS
(There are 40 questions for a total of 200 points.) g = 9.8 m/s/s = 32 ft/s/s
1

1.
If you create a short-circuit in a flashlight
(a) The lamp lights brightly.
(b) The + and

terminals are directly connected.
(c) The switch is open.
(d) Charges flow from the battery, through the lamp, and back to battery.
2.
In a conducting material
(a) Electrons are free to move.
(b) Protons are free to move.
(c) Both + and

charges move equally.
(d) Electric currents are not possible.
3.
A bar magnet is broken in half.
(a) One half contains only a north pole and the other half only a south pole.
(b) Each half still contains a north pole and a south pole.
(c) This creates two monopoles in the magnet.
(d) The magnet loses all of its magnetism.
4.
A small magnet is placed near a coil of wire.
(a) The coil has a current whenever the magnet is near the coil.
(b) A current appears in the coil only if the magnet is held stationary inside the coil.
(c) A current appears in the coil if the magnet is moved near the coil.
(d) The magnet has no effect on the coil regardless of its motion.
5.
Power companies use transformers to
(a) To raise or lower DC voltages
(b) To raise or lower AC voltages
(c) To convert AC power to DC power.
(d) Lower the voltage that is transmitted over long distances.
6.
In a loudspeaker
(a) A coil with a constant current is used to induce a magnetic field.
(b) A changing current in a coil causes a magnet to oscillate.
(c) A moving magnet is used to induce a current in a coil.
(d) A changing current in a moveable coil causes the coil to be attracted to or repelled by a permanent magnet.
7.
At airport security you walk through a large frame. This frame most likely contains
(a) A large battery that produces a magnetic field.
(b) A large permanent magnet.
(c) A transmitter of EM waves.
(d) A coil of wire with a current that produces a magnetic field.
2

8.
For FM
(a) The modulated part of the wave contains the sound information.
(b) Frequency is constant.
(c) Amplitude is varied with the frequency.
(d) Modulation enables the EM wave to be sent.
9.
EM waves can be produced by
(a) A magnet held near a stationary coil.
(b) Making electric charges oscillate in a conducing rod.
(c) A constant current in a wire.
(d) Only if a medium such as air is present to carry them.
10.
A conducting loop antenna responds to
(a) The electric part of the EM wave.
(b) The magnetic part of the EM wave.
(c) Either the electric or magnetic part.
(d) Neither the electric nor the magnetic part.
11.
For sound material intended for a CD
(a) The amplitude of the analog sound wave must be translated into a sequence of digital numbers.
(b) The material must be digital in origin initially.
(c) The frequency of sampling is unimportant.
(d) Digital works better because our ears hear digital better.
12.
In a microwave oven which of the following will heat least easily
(a) Cooking oil.
(b) Meat.
(c) Soup.
(d) Vegetables.
13.
In a microwave oven, energy is transferred effectively to water molecules because
(a) Water is a liquid.
(b) They have equal amounts of positive and negative charge.
(c) The water molecules become magnetic when “struck” by the EM waves.
(d) The microwaves cause the water molecules to oscillate rapidly back and forth.
14.
Light waves
(a) Can travel through empty space but EM waves cannot.
(b) Travel at the same speed as all EM waves.
(c) Travel faster than other EM waves.
(d) Are completely different from EM waves.
3

15.
When I played the music in class the screen showed the
(a) The frequency of the music by one performer only.
(b) The amplitude of the music by one performer only.
(c) The amplitude of all of the music.
(d) The amplitude and frequency of all of the music.
16.
Which of the following constitute, in order, the scientific method?
(a) Observe, test, hypothesize.
(b) Test, observe, hypothesize.
(c) Test, hypothesize, observe.
(d) Observe, hypothesize, test.
17.
You are driving in your car at a constant speed when you suddenly apply your brakes forcefully in order to stop. You feel yourself being thrown forward because
(a) The friction between you and the car seat is small.
(b) A large forward force suddenly acts on you.
(c) Objects in motion remain in motion.
(d) Gravity pulls you forward.
18.
You and your friend are standing on the roof of Everett Tower. You throw a baseball horizontally from the roof at the same instant that your friend drops a bowling ball vertically from the same height. Assuming level terrain and ignoring air resistance
(a) The bowling ball and baseball strike the ground at the same time.
(b) The baseball strikes the ground first because it is lighter.
(c) The bowling ball strikes the ground first because it is heavier.
(d) The bowling ball strikes the ground first because it is dropped vertically.
19.
You are standing motionless on roller skates on a smooth (frictionless) surface. You throw a basketball horizontally forward directly away from you.
(a) You are able to throw the basketball without recoiling backward.
(b) You recoil backward with the same momentum as the basketball that goes forward.
(c) You recoil backward with a speed greater than the speed of the basketball.
(d) You recoil backwards with a speed equal to the speed of the basketball.
20.
You drop a rock from a height of 2 meters. As the rock falls
(a) The total energy of the rock increases.
(b) Its gravitational potential energy (PE) increases and its kinetic energy (KE) decreases.
(c) Its gravitational potential energy (PE) decreases and its kinetic energy (KE) increases.
(d) The momentum of the rock remains the same.
21.
A golf ball and a feather are dropped simultaneously on the moon where there is no air.
(a) Neither object falls because there is no gravity on the moon.
(b) The golf ball falls faster because heavier objects always fall faster.
(c) The ball and feather fall the same as they would fall on earth where there is air.
(d) The ball and the feather fall together at the same rate.
4

22.
When you walk
(a) The floor pushes on you with a greater force than you push on the floor.
(b) You push on the floor with a greater force than the floor pushes on you.
(c) You and the floor push on each other equally.
(d) Only you push on the floor because a floor can’t push on you.
23.
A long pole helps a tight rope walker to maintain balance because it
(a) Decreases his torque.
(b) Increases his mass.
(c) Lowers his center of mass.
(d) Increases his rotational inertia.
24.
If you stop your car by locking your wheels so that the tires skid on the road surface
(a) KE is transformed into PE.
(b) Energy is lost.
(c) KE is transformed into thermal (heat) energy.
(d) PE is transformed into thermal energy.
25.
In order to open a door most effectively
(a) The force applied is more important than the lever arm.
(b) Only the lever arm is important.
(c) The force and the lever arm are equally important.
(d) The direction in which the force is applied is not important.
26.
To soften the impact when catching a ball you should
(a) Increase the time of impact.
(b) Make the time of impact as short as possible.
(c) Move your hand toward the oncoming ball.
(d) Remain stationary.
27.
When playing tennis you “follow through” in order to
(a) Increase the force of impact with the ball.
(b) Shorten the time of impact with the ball.
(c) Maximize the rotational inertia of the racquet.
(d) Increase the momentum given to the ball.
28.
If you would like to cause a merry-go-round to rotate starting from rest in the most effective way, you should
(a) Increase the rotational inertia.
(b) Decrease the lever arm.
(c) Push perpendicular to a radius.
(d) Push towards the center.
5

29.
You place 3 lbs of grapefruit in a “basket scale” at the supermarket and you notice that the spring stretches 2 cm. To make the spring stretch by an additional 2 cm (for a total stretch of
4 cm), you should add how many lbs of grapefruit?
(a) 2 lbs.
(b) 3 lbs.
(c) 6 lbs.
(d) 9 lbs.
30.
You whirl a pail of water at the end of your arm in a large vertical circle so that no water leaves the pail when it is upside down at the top of the circle. This is possible because
(a) An inward centripetal force acts on the water.
(b) Gravity stops acting on the water at the top of the circle.
(c) The outward centrifugal force holds the water in the bucket.
(d) There is no force acting on the water.
31.
A golf ball dropped from rest rebounds from a solid concrete floor.
(a) The momentum of the ball is the same before and after rebounding.
(b) The KE of the ball is the same before and after rebounding.
(c) The ball rebounds with a speed less than its initial speed.
(d) The ball could rebound with speed greater than its initial speed.
32.
By pulling her arms and legs inward close to her body a spinning ice skater increases her rotational speed because
(a) For every action there is an equal and opposite reaction.
(b) Rotational momentum is conserved.
(c) Her rotational inertia increases.
(d) Energy is conserved.
33.
A satellite orbiting the earth
(a) Has no force acting on it.
(b) Requires constant power from a rocket to keep it in orbit.
(c) Falls continuously around the earth.
(d) Does not experience the effect of gravity.
34.
If you do work on a rock by lifting it
(a) Its momentum increases.
(b) The energy of the rock remains constant.
(c) Both you and the rock gain energy.
(d) You transfer energy to the rock.
35.
A car traveling 30 mi/hr and a second identical car traveling 60 mi/hr both lock their brakes and slide to a stop.
(a) The car traveling at 60 mi/hr requires four times the distance to stop.
(b) The car traveling at 30 mi/hr requires half the distance to stop.
(c) The stopping distance is shorter for the 30-mi/hr car, but the stopping times are equal.
(d) The stopping distance does not depend on the initial speed of the cars.
6

36.
A ship made from steel
(a) Can never be made to float in water.
(b) Will float if the volume of water is large enough.
(c) Floats if it displaces a weight of water equal to its own weight.
(d) Can float only in salt water.
37.
As the mass on a spring is increased
(a) The period remains the same.
(b) The period depends on the length of the spring.
(c) The period increases.
(d) The period can remain the same if the amplitude of the oscillation is decreased.
38.
The soft canvas roof of a convertible automobile bulges upward when the car is traveling at high speeds because
(a) The pressure of the stationary air inside the car increases as the speed of the car increases.
(b) The pressure of the moving air above the car is less than the air pressure inside the car.
(c) The air pressure above the car is higher than the air pressure inside the car.
(d) The canvas roof permits fast moving air to enter the car and therefore blow the roof upward.
39.
To be useful as a time keeping mechanism, an oscillating object must have a frequency that
(a) Is independent of the amplitude of the oscillation.
(b) Increases with the length of the oscillating object.
(c) Depends on the amplitude of the oscillation.
(d) Depends of the mass of the oscillating object.
40.
If the tension of a guitar string is increased
(a) The volume increases.
(b) The frequency decreases.
(c) The pitch increases.
(d) More air is required to make it oscillate.
7