PHYSICS 1210- EXAM2-HW

Which contains more atoms: 1 kg of lead or 1kg of aluminum? 1 kg of lead 1 kg of aluminum

1 kg of aluminum

An airplane that flies at 100 km/h in a 100 km/h hurricane crosswind has a ground speed of what? 200 km/h. 0 km/h. 141 km/h. 100 km/h.

141 km/h.

Do 100 J of work in 50 s and your power output is 50 W. 4 W. 2 W. 1/2 W 5,000 W.

2 W.

How many individual atoms are in a water molecule?

3

A TV set is pushed a distance of 2 m with a force of 20 N. How much work is done on the set? 20 J 10 J 800 J 40 J 2 J

40 J

In a simple machine, how much work is done when an input of 10 N acts over a distance of 5 m? 5 J 50 J 15 J 10 J

50 J

When the useful energy output of a simple machine is 100 J, and total energy input is 200 J, the efficiency is _______. 200% 100% 50% 75%

50%

What is the force of gravity on a 500-newton woman standing on the Earth's surface? 50 N 250 N 5000 N 500 N none of these

500 N

A projectile is launched at 30° above ground level. What other angle at the same speed will result in the same range? 60° 15° any angle at 60° or greater 45°

60°

How many atoms are in a molecule of ethanol, C2H6O?

9

Earth's gravitational field is strongest at _______. infinity, in principle Earth's center Earth's surface either the Earth's center or at its surface

Earths Surface

Which of the following are negatively charged? Protons Electrons Neutrons Atomic nuclei

Electron

Which of these atoms has the largest number of neutrons in the nucleus? Helium Gold Carbon Hydrogen

Gold

Which of the following is an element? Hydrogen A supernova Carbon dioxide H2O

Hydrogen

Calculate the kinetic energy of a 2.0-kg toy cart that moves at 9.0 m/s . Kinetic energy = 1/2 mass × speed^2 KE = 1/2mv^2

K = 81 J

Which of the following is NOT a mixture? air granite cake beach sand None. All of the above choices are mixtures.

None. All of the above choices are mixtures.

For an Earth satellite in circular orbit, list all the values that do not change Speed and gravitational force only Only speed, gravitational force, and distance from Earth Speed, gravitational force, and distance from the Sun and Earth Speed only

Only speed, gravitational force, and distance from Earth

The smallest particle of those listed below is a proton. a quark. a molecule. a neutron. an atom.

a quark.

A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation of 5 m above the ground. The player sees the ball land 20 m down range. What is the player's pitching speed? about 25 m/s about 20 m/s about 10 m/s about 5 m/s none of these

about 20 m/s

As the text cites, atoms are incredibly tiny, numerous, perpetually moving, and what else? New in science Mainly in the air Migratory Ageless

ageless

A hydraulic press, like an inclined plane, is capable of increasing energy. ometimes false always true sometimes true always false

always false

When properly used, a hydraulic press, like a wheel and axle, is capable of multiplying force input. sometimes false always true sometimes true always false

always true

Nuclei of atoms that make up a newborn baby were made in the mother's womb. the food the mother eats before giving birth. the Earth. ancient stars. none of these

ancient stars

Inside a freely falling elevator, there would be no__________. apparent weight for you. gravitational force on you. both of these none of these

apparent weight for you.

Energy cannot be _______. transformed transferred destroyed transferred, transformed, or destroyed

destroyed

The work that is done when twice the load is lifted twice the distance is _______. three times as much the same twice as much four times as much

four times as much

When you lift twice the load twice as high, in half the time, the increase in potential energy is _______. three times as much double four times as much the same

four times as much

An Earth satellite is simply a projectile freely falling around the Earth. floating motionless in space near the Earth. approaching the Earth from outer space.

freely falling around the Earth.

An important feature of atoms is that they _______. make up electric beams are actually tiny solar systems have wave properties can barely be seen with the naked eye

have wave properties

When an automobile is braked to a stop, its kinetic energy is transformed to... energy of motion. potential energy. stopping energy. energy of rest. heat

heat

The direction of a gravitational field is... away from the center of gravity of an object. opposite to the direction of gravitational attraction. in the same direction as the gravitational attraction.

in the same direction as the gravitational attraction.

The horizontal and vertical components of velocity for a projectile are _______. dependent on each other independent of each other parts of a parabola equal for angles greater than 45°

independent of each other

A projectile is fired horizontally in a region of no air resistance. The projectile maintains its horizontal component of velocity because it is not acted on by any horizontal forces. it is not acted on by any forces. the net force acting on it is zero. it has no vertical component of velocity to begin with. none of these

it is not acted on by any horizontal forces.

Which has the greatest number of protons in its nucleus? lead. mercury. silver. gold.

lead

An object may have potential energy because of its location. momentum. acceleration. speed. none of these

location

To become a positive ion, does an atom lose or gain an electron?

lose

The constant G in Newton's equation _______. produces equilibrium shows gravity to be a relatively huge force makes the units of measurement consistent was measured by Newton

makes the units of measurement consistent

One's weightlessness in space has most to do with _______. no gravity one's mass no support force rotational effects

on support force

Brownian motion has to do with the random motions of atoms and molecules. rhythmic movements of atoms in a liquid. first direct measurement of atomic motion. size of atoms. atomic vibrations.

random motions of atoms and molecules.

Which of the following is not a vector quantity? velocity speed acceleration None are vector quantities. All are vector quantities.

speed

Which is most responsible for the ocean tides? the moon the sun Both contribute equally.

the moon

When one does twice the work in twice the time, the power expended is _______. three times as much twice as much the same four times as much

the same

After rolling halfway down an incline, a marble's kinetic energy is... the same as its potential energy. greater than its potential energy. less than its potential energy. impossible to determine.

the same as its potential energy.

The ball rolling down an incline has its maximum potential energy at a quarter of the way down. halfway down. the top. the bottom.

the top

If you push an object twice as far while applying the same force, you do four times as much work. twice as much work. half as much work. the same amount of work.

twice as much work.

If two protons and two neutrons are removed from the nucleus of an oxygen atom, what nucleus remains?

carbon

The main reason ocean tides exist is that the pull of the moon and the sun on the oceans are in opposite directions. is greater on oceans closer to the moon and less on oceans farther from the moon. is greater on the Earth because the moon is closer to Earth. and sun are in conjunction at high tides and in opposition at low tides. none of these

is greater on oceans closer to the moon and less on oceans farther from the moon.

The reason a granite block is mostly empty space is that the atoms in the granite are held together by electrical forces. invisible. not as close together as they could be. in perpetual motion. mostly empty space themselves.

mostly empty space themselves.

If you push for a half hour or a whole hour against a stationary wall no work on the wall is done in either case. half as much work is done during the half hour. twice as much work is done during the half hour. it is impossible to determine how much work is done.

no work on the wall is done in either case.

A light aluminum ball and a heavy lead ball of the same size are allowed to roll down an incline. When they are halfway down the incline, they will have identical potential energies. momentum. inertias. kinetic energies. none of the above choices

none of the above choices

In an electrically neutral atom, the number of protons in the nucleus is balanced by an equal number of orbital electrons. quarks. neutrons. all of these none of these

orbital electrons.

A job is done slowly, while an identical job is done quickly. Both jobs require the same amount of work, but different amounts of effort. power. energy. none of these

power.

If you drop a stone into a hole drilled all the way to the other side of the Earth (neglect the molten core), the stone will... slow down until it reaches the center. speed up until it gets to the center of the Earth. come to an abrupt stop at the center of the Earth. speed up until it reaches the other side of the Earth.

speed up until it gets to the center of the Earth.

Ocean tides on Earth are mainly affected by _______. the pull of distant planets Earth's revolution about both the Moon and the Sun the Moon and the Sun only the Moon

the Moon and the Sun

A hunter on level ground fires a bullet at an angle of 2 degrees below the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first? the dropped one the fired one Both hit at the same time

the fired one

If an object is raised twice as high, its potential energy will be half as much four times as much. twice as much. impossible to determine unless the time is given.

twice as much.

How many different elements are in a water molecule? two none three four one Submit

two

If you find that twice as much work is needed to perform a task but it takes twice as much time, the amount of power required is unchanged. twice as much. sixteen times as much. four times as much.

unchanged.

Which of the following is not an element? hydrogen carbon oxygen water

water

Passengers in a high-flying jumbo jet feel their normal weight in flight, while passengers in the orbiting space shuttle do not. This is because passengers in the space shuttle are... without support forces. above the Earth's atmosphere. beyond the main pull of Earth's gravity. all of these none of these

without support forces.

What happens to the force of attraction between two planets when the distance between them is doubled? The force decreases to one quarter. The force doubles. The force decreases to half. The force remains the same.

The force decreases to one quarter.

What happens to the force of attraction between two planets when the masses of both are doubled? The force doubles. The force increases by 16. The force quadruples. The force remains the same.

The force quadruples.

About how far below a straight-line path does a satellite in close Earth orbit fall in the first second of fall? 5 meters Depends on the projected speed 10 meters Zero meters

5 meters

How far below a straight-line path does a horizontally projected projectile fall in the first second of fall? 5 meters Zero meters Depends on the projected speed 10 meters

5 meters

A bullet fired horizontally from a rifle begins to fall after air friction reduces its speed. as soon as it leaves the barrel. neither of these

as soon as it leaves the barrel.

The periodic table of the elements is a list of _______. isotopes molecules atoms ions

atoms

The Earth's gravitational field extends... only above and beyond the Earth's surface and cancels inside the Earth. both inside and outside the Earth and throughout the entire universe. neither of these

both inside and outside the Earth and throughout the entire universe.

If the sun were twice as massive the pull of the Earth on the sun would double. its pull on the Earth would double. both of these neither of these

both of these

When traveling twice as fast your kinetic energy is increased _______. by three by four not at all by two

by four