Physics Final

A block of 1kg lead and a block of 1kg aluminum are both fully submerged in water. Which block experience a higher buoyancy force?

aluminum block

A positron orbiting an antiproton would make up an atom of

anti-hydrogen.

When a system does work and no heat is added to the system, its temperature

decreases

According to Newton, doubling the distance between two interacting objects

divides by 4 the gravitational force between them.

In a mixture of hydrogen gas, oxygen gas, and nitrogen gas, the molecules with the greatest average speed are those of

hydrogen

If at a concert you run toward the orchestra, the frequency of the sound you hear will be

increased

Compared to a 50-kg person, a 100-kg person at the beach requires

less than twice as much suntan lotion.

LOOK AT MIDTERM # # 31-32

look

LOOK AT MIDTERM @ 2

look

A kilogram is a measure of an object's

mass

A node is a position of

minimum amplitude.

A skydiver falls towards the Earth. The attraction of the Earth on the diver pulls the diver down. What is the reaction to this force?

none of these SKYDIVER PULLS EARTH

The maximum acceleration of a car while towing a second car twice its mass, compared to its acceleration with no car in tow, is

one third.

Your weight is

the gravitational attraction force between you and the Earth

The food in a refrigerator is cooled by

vaporization of the refrigerating fluid.

Compare accelerating a car on the moon and that on the Earth. Which of the following statements are correct (assume the atmosphere composition and conditions are identical

the mass of the car is independent of gravity. It is easier to accelerate a car on the moon than on the earth when the car is going uphill.

The fact that a thermometer "takes its own temperature" illustrates

thermal equilibrium

At the same temperature, which move with the greater speed in the air?

very light molecules

The Doppler effect is characteristic of

A) water waves. B) sound waves. C) light waves.

Considering the amount of water displaced by the two ships. Which of the following is true?

The wooden ship displaces the same amount of water as the styrofoam ship.

If a loaf of bread is compressed, its

average density increases.

If the speed of a wave doubles while the frequency stays the same, how does the wavelength change?

doubles

Suppose the temperature of the input reservoir in a heat engine doesn't change. As the sink temperature is lowered, the efficiency of the engine

increases

If your automobile runs out of fuel while you are driving, the engine stops but you do not come to an abrupt stop. The concept that most explains why is

inertia.

In cooking a turkey in a conventional oven at a given temperature, compared to a mediumsized turkey, a large turkey takes

more time per pound to cook.

The white-hot sparks that strike your skin from a 4th-of-July-type sparkler don't harm you because

the energy per molecule is high, but little energy is transferred because of the few molecules in the spark.

Compared to the buoyant force of the atmosphere on a 1-liter helium-filled balloon, the buoyant force of the atmosphere on a nearby 1-liter solid iron block is

the same.

The gravitational acceleration on earth at sea level is approximately 10m/s2. If the earth mass suddenly doubled without changing its radius, what would be the new gravitational acceleration on earth at sea level?

20 m/s2

Consider a piece of metal that is at 10 degrees C. If it is heated until it has twice the internal energy, its temperature will be

293 degrees C.

Two identical blocks of iron, one at 10 degrees C and the other at 20 degrees C, are put in contact. Suppose the cooler block cools to 5 degrees C and the warmer block warms to 25 degrees

2nd law of thermodynamics.

In the above question, if the stone is instead thrown horizontally with a speed of 5 m/s, how long does it take for the stone to reach the ground?

3 s

Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave received at 100 megahertz is

3.0 m.

An astronaut on another planet drops a 1-kg rock from rest. The astronaut notices that the rock falls 2 meters straight down in one second. On this planet, how much does the rock weigh?

4 N

Two people, one twice as massive as the other, attempt a tug-of-war with 12 meters of massless rope on frictionless ice. After a brief time, they meet. The heavier person slides a distance of

4 m.

A stone is thrown horizontally from the top of a cliff with a speed of 10m/s. Three seconds after it has left your hand, the stone has reached the ground. How high is the cliff? (The gravitational acceleration on the surface of earth is approximately 10m/s2)

45 m.

A metal block has a mass of 5 grams and a volume of 1 cubic centimeter. A piece of the same kind of metal with a volume of 2 cubic centimeters has a density of

5 g/cm3

Consider a special liquid which has a density of 2g/cm3. If such liquid is used to make a barometer on a day when atmospheric pressure is normal, the height of the fluid column would be

5.15 m

A wooden block has a mass of 1000 kg and a volume of 2 cubic meters. What is the block's density?

500 kg per cubic meter

Jake measured the shadow of a tree which is known to be 10 meters tall. He found that the tree casts a shadow that is 1.25 meters long, and the angle between tree and sunlight (from Alpha Centauri A) is about 7º12'. At the same time, Neytiri, located 700km south of Jake found that the sunlight is directly shining on Pandora - the trees around Neytiri does not cast any shadow. What is the radius of Pandora ?

5600km

The gravitational acceleration on earth at sea level is approximately 10m/s2. What is the gravitational force between a 80-kg person and the earth when the person is at sea level?

800 N

Which of the following bodies is comprised mostly of plasma?

A) Sun

Heat energy is measured in units of

A) joules. B) calories.

Which of them can be considered as scientific statements?

(i) The moon is made of green cheese. (ii) The mass of an electron is 9.10938188 × 10-31 kilograms. (iv) Objects whose net force are zero will move at constant speed. (v) Objects whose net force are zero always want to be at rest relative to mother earth.

Which of the following statements are correct?

(iii) The force exerted from the concrete to the truck is 100N in magnitude from t=1sec to t=2sec. (iv) The friction force between the concrete and the truck is 200N in magnitude from t=3sec to t=5sec.

If the frequency of a certain wave is 10 hertz, its period is

0.1 second.

What is the density of egg?

1.1g/cm3

Exactly how high can Neytiri jump on Pandora?

16 m

A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is

60 hertz and it travels at 30 m/s.

How does the volume of the big sphere compare to the volume of one small sphere?

It has eight times the volume of a small sphere.

The smallest particle of those listed below is

a quark.

The human body can, under certain conditions, withstand an acceleration of 10 g. What net force would produce this acceleration of a 50-kg person?

about 5000 N

If an object of constant mass experiences a constant net force, which of the followings must be constant?

acceleration

Which of the following is not a compound?

air

Which body glows with electromagnetic waves?

both the Sun and the Earth

Blow on your hand with your open mouth and you feel the warmth of your breath. Pucker your lips so your breath expands as you blow and your breath is

cooler

When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. The reason for this is

copper expands more than iron.

A bullet is dropped from the top of the Empire State Building while another bullet is fired downward from the same location. Neglecting air resistance, the acceleration of

each bullet is the same.

A Doppler effect occurs when a source of sound moves

either towards you or away from you.

If you throw a stone (density=2g/cm3) into a container filled with Mercury, the stone will

float

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to

follow a straight-line path.

A large and a small person wish to parachute at equal terminal velocities. The larger person will have to

get a larger parachute.

Consider drops of water that leak at a steady rate from a dripping faucet. As the drops fall they

get farther apart.

According to Newton, the greater the masses of interacting objects, the

greater the gravitational force between them.

If you double the frequency of a vibrating object, its period

halves.

In an electrically neutral atom, the number of protons in the nucleus is balanced by an equal number of

orbital electrons.

If your mass, the mass of the Earth, and the mass of everything in the solar system were twice as much as it is now, yet everything stayed the same size, your weight on Earth would

quadruple.

Which of the following methods is responsible for the energy transfer from Sun to Earth?

radiation

A row boat containing a barrel of water floats in a swimming pool. When the water in the barrel is poured overboard, the swimming pool level will

remain unchanged.

A refrigerator

removes internal energy from inside the refrigerator.

The force exerted on the tires of a car to directly accelerate it along a road is exerted by the

road

You dip your finger repeatedly into water and make waves. If you dip your finger more frequently, the wavelength of the waves

shortens

If you throw a piece of ice (density=0.92g/cm3) into a container filled with pure alcohol, the ice will

sink

Two factors that greatly affect air resistance on falling objects are the

size and speed of the object.

To multiply the input force of a hydraulic lift , the input end should be the one having the

smaller diameter piston.

If we doubled the magnifying power of the most powerful optical microscope in the world, we would

still not be able to see or photograph an atom.

A factor that usually determines whether a substance is in the solid, liquid, gaseous, or plasma state is its

temperature

When holes are drilled through the wall of a water tower , water will spurt out the greatest horizontal distance from the hole closest to

the bottom of the tower.

Which potatoes when peeled produce the most peelings

10 kg of small potatoes

Which could burn a boy scout the most?

100 g of steam at 100 degrees C

What is the weight of water displaced by a 100-ton floating ship?

100 tons

How high would Neytiri be able to jump, if she visits the earth ?

12.8 meters

In the above question, what is the horizontal distance traveled by the 5m/s stone before it hits the ground?

15 m

A canon shoots out a canon ball on a frictional surface. The acceleration of the canon ball is 2000m/s2 and the mass of the canon ball is 1kg. The acceleration of the canon is 0.5m/s2 and the mass is 1000kg. What is the friction between the canon and the earth?

1500N

Jake's friend, Neytiri, is able to jump very high on Pandora. She can stay in the air for 4 seconds before she returns to the ground. What is her initial speed when she leaves the ground?

16 m/s

Compared to a bar of pure gold, the density of a pure gold ring is

B) the same.

Compared to the mass of a certain object on Earth, the mass of the same object on the moon is

B) the same.

Jake dropped a stone from a height of 1 meter on Pandora. He found that it takes the stone 0.5 seconds to reach the ground. What is the gravitational acceleration on Pandora?

C) 8 m/s2

How does the surface area of the big sphere compare to the surface area of one small sphere

C) It has four times the surface area of a small sphere.

Jake encountered a cliff during his exploration. He dropped a 1000kg stone down the cliff. He then heard the stone reached the ground after 10 seconds. What is the height of the cliff?

D) 400 m

Before the egg floats, which of the following is true?

During the process of salt-adding, the buoyancy keeps increasing.

How does the radius of the big sphere compare to the radius of one small sphere?

It has two times the radius of a small sphere.

Considering the force required to fully submerge the ships into water. Which of the following is true?

More force is required to apply for the styrofoam ship to fully submerge it in water.

After the egg floats to the surface, which of the following is true?

The buoyancy will not change at all if salt is further added to the solution.

Consider a sample of water at 0 degrees C. If the temperature is slightly increased, the volume of the water

decreases

If glass expanded more than mercury, then the column of mercury in a mercury thermometer would rise when the temperature

decreases

If object A in your left hand and object B in your right hand both have the same weight density, then they

have equal mass densities.

The moderate temperatures of islands throughout the world has much to do with water's

high specific heat.

Some molecules are able to absorb large amounts of energy in the form of internal vibrations and rotations. Materials composed of such molecules have

high specific heats.

A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is

zero.