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85 important questions on Powerpoint Questions

The use of inclined planes for Galileo's experiments helped him to

  1. eliminate the acceleration of free fall.
  2. discover the concept of energy.
  3. discover the property called inertia.
  4. discover the concept of momentum

Discover the property called inertia

Referring to the figure, which of the following are true statements?

  1. 50 N is the resultant of the 30- and the 40-N vectors.
  2. The 30-N vector can be considered a component of the 50-N vector.
  3. The 40-N vector can be considered a component of the 50-N vector.
  4. All of the above are correct.

All of the above are correct


The equilibrium rule, ΣF = 0, applies to

  1. vector quantities.
  2. scalar quantities.
  3. Both of the above.
  4. None of the above.

Vector quantities
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A bowling ball is in equilibrium when it

  1. is at rest.
  2. moves steadily in a straight-line path.
  3. Both of the above.
  4. None of the above.

Both of the above

You push a crate at a steady speed in a straight line. If the friction force is 75 N, how much force must you apply?

  1. More than 75 N.
  2. Less than 75 N.
  3. Equal to 75 N.
  4. Not enough information.

Equal to 75 N

You are riding in a vehicle at a steady speed and toss a coin straight upward. Where will the coin land?

  1. Behind you.
  2. Ahead of you.
  3. In your hand.
  4. There is not enough information.

In your hand

The average speed of driving 30 km in 1 hour is the same as the average speed of driving

  1. 30 km in 1/2 hour.
  2. 30 km in 2 hours.
  3. 60 km in 1/2 hour.
  4. 60 km in 2 hours.

60 km in 2 hours

An automobile is accelerating when it is

  1. slowing down to a stop.
  2. rounding a curve at a steady speed.
  3. Both of the above.
  4. Neither of the above.

Both of the above

At a particular instant a free-falling object has a speed of 30 m/s. Exactly 1 s later its speed will be

  1. the same.
  2. 35 m/s.
  3. more than 35 m/s.
  4. 60 m/s.

More than 35 m/s

What is the distance fallen after 4 s for a freely falling object starting from rest?

  1. 4 m
  2. 16 m
  3. 40 m
  4. 80 m

80 m


The force of friction can occur

  1. with sliding objects.
  2. in water.
  3. in air.
  4. All of the above.

All of the above

When Sanjay pushes a refrigerator across a kitchen floor at a constant speed, the force of friction between the refrigerator and the floor is

  1. less than Sanjay's push.
  2. equal to Sanjay's push.
  3. equal and opposite to Sanjay's push.
  4. more than Sanjay's push.

Equal and opposite to Sanjay's push

If the mass of an object is halved, the weight of the object is

  1. halved.
  2. twice.
  3. depends on location.
  4. None of the above.

Halved

At one instant, an object in free fall has a speed of 40 m/s. Its speed 1 second later is
  1. also 40 m/s.
  2. 45 m/s.
  3. 50 m/s.
  4. None of the above.

50 m/s

A 5-kg iron ball and a 10-kg iron ball are dropped from rest. For negligible air resistance, the acceleration of the heavier ball will be

  1. less.
  2. the same.
  3. more.
  4. undetermined.

The same

At a moment, a 20-N falling object encounters 5 N of air resistance, its acceleration of fall at this moment is

1. less than g.
2. more than g.
3. g.
4. terminated.

Less than g

If a 50-N person is to fall at terminal speed, the air resistance needed is

  1. less than 50 N.
  2. 50 N.
  3. more than 50 N.
  4. None of the above.

50 N

As the skydiver falls faster and faster through the air, air resistance

  1. increases.
  2. decreases.
  3. remains the same.
  4. Not enough information.

Increases

A soccer player kicks a ball with 1500 N of force. The ball exerts a reaction force against the player's foot of

  1. somewhat less than 1500 N.
  2. 1500 N.
  3. somewhat more than 1500 N.
  4. None of the above.

1500 N

When a cannon is fired, the accelerations of the cannon and cannonball are different because the

  1. forces don't occur at the same time.
  2. forces, although theoretically the same, in practice are not.
  3. masses are different.
  4. ratios of force to mass are the same.

Masses are different

Two people of equal mass on slippery ice push off from each other. Will both move at the same speed in opposite directions?

  1. Yes
  2. Yes, but only if both push equally.
  3. No
  4. No, unless acceleration occurs.

Yes

The apple-orange system will move with constant speed if

  1. the orange loses mass.
  2. the apple gains mass.
  3. a force equal and opposite to the friction force occurs.
  4. None of the above.

A force equal and opposite to the friction force occurs

When the speed of an object is doubled, its momentum

  1. remains unchanged in accord with the conservation of momentum.
  2. doubles.
  3. quadruples.
  4. decreases.

Doubles

When the force that produces an impulse acts for twice as much time, the impulse is

  1. not changed.
  2. doubled.
  3. quadrupled.
  4. halved.

Doubled

When a dish falls, will the change in momentum be less if it lands on a carpet than if it lands on a hard floor? (Careful!)

  1. No, both are the same.
  2. Yes, less if it lands on the carpet.
  3. No, less if it lands on a hard floor.
  4. No, more if it lands on a hard floor.

No, both are the same

Freight car A is moving toward identical freight car B that is at rest. When they collide, both freight cars couple together. Compared with the initial speed of freight car A, the speed of the coupled freight cars is

  1. the same.
  2. half.
  3. twice.
  4. None of the above.

Half

If you push against a stationary brick wall for several minutes, you do no work

  1. on the wall.
  2. at all.
  3. Both of the above.
  4. None of the above.

On the wall

You do work when pushing a cart with a constant force. If you push the cart twice as far, then the work you do is

  1. less than twice as much.
  2. twice as much.
  3. more than twice as much.
  4. zero.

Twice as much

A job can be done slowly or quickly. Both may require the same amount of work, but different amounts of

  1. energy.
  2. momentum.
  3. power.
  4. impulse.

Power

Does a car hoisted for repairs in a service station have increased potential energy relative to the floor?

  1. Yes
  2. No
  3. Sometimes
  4. Not enough information

Yes

Consider a problem that asks for the distance of a
fast-moving crate sliding across a factory floor and then coming to a stop. The most useful equation for solving this problem is

1. F = ma.
2. Ft = ∆p.
3. KE = 1/2mv2.
4. Fd = ∆KE.

Fd = ∆KE

The work done in bringing a moving car to a stop is the force of tire friction x stopping distance. If the initial speed of the car is doubled, the stopping distance is

  1. actually less.
  2. about the same.
  3. twice.
  4. None of the above.

None of the above

Suppose the potential energy of a drawn bow is 50 joules and the kinetic energy of the shot arrow is 40 joules. Then

  1. energy is not conserved.
  2. 10 joules go to warming the bow.
  3. 10 joules go to warming the target.
  4. 10 joules are mysteriously missing.

10 joules go to warming the bow

In an ideal pulley system, a woman lifts a 100-N crate by pulling a rope downward with a force of 25 N. For every
1-meter length of rope she pulls downward, the crate rises

  1. 50 centimeters.
  2. 45 centimeters.
  3. 25 centimeters.
  4. None of the above.

25 centimeters

A certain machine is 30% efficient. This means the machine will convert

  1. 30% of the energy input to useful work—70% of the energy input will be wasted.
  2. 70% of the energy input to useful work—30% of the energy input will be wasted.
  3. Both of the above.
  4. None of the above.

  1. 30% of the energy input to useful work—70% of the energy input will be wasted

A ladybug sits halfway between the rotational axis and the outer edge of the turntable. When the turntable has a rotational speed of 20 RPM and the bug has a tangential speed of 2 cm/s, what will be the rotational and tangential speeds of her friend who sits at the outer edge?

  1. 1 cm/s
  2. 2 cm/s
  3. 4 cm/s
  4. 8 cm/s

4 cm/s

A hoop and a disk are released from the top of an incline at the same time. Which one will reach the bottom first?

  1. Hoop
  2. Disk
  3. Both together
  4. Not enough information

Disk

Suppose you double the speed at which you round a bend in the curve, by what factor must the centripetal force change to prevent you from skidding?

  1. Double
  2. Four times
  3. Half
  4. One-quarter

Four times

Suppose you are swirling a can around and suddenly decide to pull the rope in halfway; by what factor would the speed of the can change?

  1. Double
  2. Four times
  3. Half
  4. One-quarter

Double

Suppose by pulling the weights inward, the rotational inertia of the man reduces to half its value. By what factor would his angular velocity change?

  1. Double
  2. Three times
  3. Half
  4. One-quarter

Double

The force of gravity between two planets depends on their

  1. masses and distance apart.
  2. planetary atmospheres.
  3. rotational motions.
  4. All of the above.

Masses and distance apart

If the mass of one planet is somehow doubled, the force of gravity between it and a neighboring planet

  1. doubles.
  2. quadruples
  3. reduces by half.
  4. reduces by one-quarter.

Doubles

When an elevator accelerates upward, your weight reading on a scale is

  1. greater.
  2. less.
  3. zero.
  4. the normal weight.

Greater

The velocity of a typical projectile can be represented by horizontal and vertical components. Assuming negligible air resistance, the horizontal component along the path of the projectile

  1. increases.
  2. decreases.
  3. remains the same.
  4. Not enough information.

Remains the same

When no air resistance acts on a fast-moving baseball, its acceleration is

  1. downward, g.
  2. a combination of constant horizontal motion and accelerated downward motion.
  3. opposite to the force of gravity.
  4. centripetal.

Downward, g

Neglecting air drag, a ball tossed at an angle of 30° with the horizontal will go as far downrange as one that is tossed at the same speed at an angle of

  1. 45°.
  2. 60°.
  3. 75°.
  4. None of the above.

60°

As the ball leaves the girl's hand, 1 second later it will have fallen

  1. 10 meters.
  2. 5 meters below the dashed line.
  3. less than 5 meters below the straight-line path.
  4. None of the above.

5 meters below the dashed line

When you toss a projectile sideways, it curves as it falls. It will be an Earth satellite if the curve it makes

  1. matches the curved surface of Earth.
  2. results in a straight line.
  3. spirals out indefinitely.
  4. None of the above.

Matches the curved surface of Earth

When a satellite travels at a constant speed, the shape of its path is

  1. a circle.
  2. an ellipse.
  3. an oval that is almost elliptical.
  4. a circle with a square corner, as seen throughout your book.

A circle

The speed of a satellite in an elliptical orbit

  1. varies.
  2. remains constant.
  3. acts at right angles to its motion.
  4. All of the above.

Varies

When a projectile achieves escape speed from Earth, it

  1. forever leaves Earth's gravitational field.
  2. outruns the influence of Earth's gravity, but is never beyond it.
  3. comes to an eventual stop, returning to Earth at some future time.
  4. All of the above.

Outruns the influence of Earth's gravity, but is never beyond it

Which of the following are incorrect statements about the atom?

  1. Atoms are smaller than the wavelength of visible light.
  2. Atoms are mostly empty space, just as the solar system is mostly empty space.
  3. Atoms are perpetually moving.
  4. Atoms are created in plants, and in humans during pregnancy.
  5. All are correct.

  1. Atoms are created in plants, and in humans during pregnancy

The atomic number of an element matches the number of

  1. protons in the nucleus of an atom.
  2. electrons in a neutral atom.
  3. Both of the above.
  4. None of the above.

Both of the above

A nucleus with an atomic number of 44 and a mass number of 100 must have

  1. 44 neutrons.
  2. 56 neutrons.
  3. 100 neutrons.
  4. All of the above.

56 neutrons

Which is more elastic—steel or rubber?

  1. Steel
  2. Rubber
  3. They are equally elastic.
  4. Not enough information.

Steel

A 10-cm-long spring extends to 12 cm when a 1-kg load is suspended from it. What would be its length if a 3-kg load were suspended from it?

  1. 14 cm
  2. 16 cm
  3. 20 cm
  4. 24 cm

16 cm

Suppose you drill a hole horizontally through a tree branch as shown. Where will the hole weaken the branch the least?

  1. Near the top
  2. Near the bottom
  3. Near the middle
  4. It does not matter.

Near the middle

If a 1-cm3 cube is scaled up to a cube that is 10 cm long on each side, how does the surface area to volume ratio change?

  1. 1/100 of original
  2. 1/10 of original
  3. 10 times original
  4. 100 times original

1/10 of original

When you stand on one foot instead of two, the force you exert on the floor is

  1. less.
  2. the same.
  3. more.
  4. None of the above.

The same

Water pressure provided by a water tower is greater if the tower

  1. is taller.
  2. holds more water.
  3. Both A and B.
  4. None of the above.

Is taller

How many forces act on a submerged body at rest in a fluid?

  1. One—buoyancy
  2. Two—buoyancy and the force due to gravity
  3. None—in accord with the equilibrium rule, ΣF = 0
  4. None of the above.

Two - buoyancy and the force due to gravity

You place an object in a container that is full to the brim with water on a scale. The object floats, but some water spills out. How does the weight of the object compare with the weight of the water displaced?

  1. Weight of object is greater than weight of water displaced.
  2. Weight of object is less than weight of water displaced.
  3. Weight of object is equal to weight of water displaced.
  4. There is not enough information to decide.

Weight of object is equal to weight of water displaced

As you sit in class, is there a buoyant force acting on you?

  1. No, as evidenced by an absence of lift
  2. Yes, due to displacement of air

Yes, due to displacement of air

Two solid blocks of identical size are submerged in water.
One block is lead and the other is aluminum. Upon which is the buoyant force greater?

  1. On the lead block
  2. On the aluminum block
  3. Same on both blocks
  4. There is not enough information to decide.

Same on both blocks

The maximum height to which water can be drunk through a straw

  1. is 10.3 m.
  2. is about 76 cm.
  3. has no limit.
  4. None of the above.

Is 10.3 m

Why don't barometers use water instead of mercury?

  1. Water cannot be used because it does not exert pressure.
  2. Water cannot be used because it sticks to the glass.
  3. Water can be used but the barometer will be too tall.
  4. None of the above.

Water can be used but the barometer will be too tall

A piston in an airtight pump is withdrawn so that the volume of the air chamber is increased 3 times. What is the change in pressure?

  1. The pressure is 3 times the original pressure.
  2. The pressure is 1/3 the original pressure.
  3. The pressure does not change.
  4. There is not enough information to figure this out.

The pressure is 1/3 the original pressure

To say that body A has a higher temperature than body B is to say that body A has more

  1. internal energy.
  2. mass.
  3. kinetic energy per particle.
  4. potential energy.

Kinetic energy per particle

If a red-hot thumbtack is immersed in cold water, the direction of heat flow will be from the

  1. warm water to the red-hot thumbtack.
  2. red-hot thumbtack to the cold water.
  3. There will be no heat flow.
  4. Not enough information.

Red-hot thumbtack to the cold water

When stringing telephone lines between poles in the summer, it is advisable to allow the lines to

  1. sag.
  2. be taut.
  3. be close to the ground.
  4. allow ample space for birds.

Sag

When a sample of 4ºC water is cooled, it

  1. expands.
  2. contracts.
  3. remains unchanged.
  4. Not enough information.

Expands

If you hold one end of a metal bar against a piece of ice, the end in your hand will soon become cold. Does cold flow from the ice to your hand?

  1. Yes
  2. In some cases, yes
  3. No
  4. In some cases, no

No

Although warm air rises, why are mountaintops cold and snow covered, while the valleys below are relatively warm and green?

  1. Warm air cools when rising.
  2. There is a thick insulating blanket of air above valleys.
  3. Both A and B.
  4. None of the above.

Both A and B

The surface of Earth loses energy to outer space due mostly to

  1. conduction.
  2. convection.
  3. radiation.
  4. radioactivity.

Radiation

If a good absorber of radiant energy were a poor emitter, its temperature compared with its surroundings would be

  1. lower.
  2. higher.
  3. unaffected.
  4. None of the above.

Higher

A hot pizza placed in the snow is a net

  1. absorber.
  2. emitter.
  3. Both A and B.
  4. None of the above.

Emitter

Which melts faster in sunshine—dirty snow or clean snow?

  1. Dirty snow
  2. Clean snow
  3. Both A and B.
  4. None of the above.

Dirty snow

Which is the better statement?

  1. A black object absorbs energy well.
  2. An object that absorbs energy well is black.
  3. Both say the same thing, so both are equivalent.
  4. Both are untrue.

An object that absorbs energy well is black

It is commonly thought that a can of beverage will cool faster in the coldest part of a refrigerator. Knowledge of Newton's law of cooling

  1. supports this knowledge.
  2. shows this knowledge is false.
  3. may or may not support this knowledge.
  4. may or may not contradict this knowledge.

Supports this knowledge

The "greenhouse gases" that contribute to global warming absorb

  1. more visible radiation than infrared.
  2. more infrared radiation than visible.
  3. visible and infrared radiation about equally.
  4. very little radiation of any kind.

More infrared radiation than visible

When you step out after a hot shower you feel cold, but you can feel warm again if you step back into the shower area. Which process is responsible for the first and second feelings?

  1. Evaporation
  2. Condensation
  3. Both of these.
  4. None of the above.

Both of these

The process of boiling

  1. cools the water being boiled.
  2. depends on atmospheric pressure.
  3. is a change of phase below the water surface.
  4. All of the above.

All of the above

When snow forms in clouds, the surrounding air is

  1. cooled.
  2. warmed.
  3. insulated.
  4. thermally conducting.

Warmed

Which involves the greatest number of calories?

  1. Condensing 1 gram of 100ºC steam to 100º water
  2. Cooling 1 gram of 100ºC water to 1 gram of 0ºC ice
  3. Cooling 1 gram of 0ºC ice to near absolute zero
  4. All about the same.

  1. Condensing 1 gram of 100ºC steam to 100º water

Ice is put in a picnic cooler. To speed up the cooling of cans of beverage, it is important that the ice

  1. melts.
  2. is prevented from melting.
  3. be in large chunks.
  4. None of the above.

Melts

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Physics 1500

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