Physics FINAL exam

What is the weight of water displaced by a 300-ton floating ship (some is above the water)?

300 tons EQUAL

Which has more momentum, a speeding baseball or an ocean liner at rest in the harbor?

baseball (it's moving)

Which has the greater density, a lake full of water or a cup full of lake water?

both have the same density

The Doppler effect occurs for

both light and sound

When you double the voltage in a simple electric circuit, what else will double?

current (V=IR)

A sheet of red paper will look black when illuminated with?

cyan light

As a skydiver continues to fall faster and faster throughout the air, her accelerating (air resistance is present)

decreases

If mercury (Hg) were used as nuclear fuel, it would be best

fissioned >26 fission <26 fused

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 (F=1/period)

A block is pulled across a floor as shown in the vector diagram. The force vector F has the greater component in the direction? O----->>

horizontal direction

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much

inertia, mass and volume

What can the human eye not see?

infrared radiation and ultraviolet radiation

When you are in the way of a fast moving object and can't get out of its way, you will suffer a smaller force of impact if you decrease its momentum over a?

long time

The electrical force between charges depends only on the charges'

magnitude and separation distance

Connect a pair of lamps in series and you draw current from the connected battery. Connect the same lamps in parallel and you draw?

more current

An iron nail is more strongly attracted to the?

north or south pole - no difference really

Several paper clips dangle from the north pole of a magnet. The induced pole in the bottom of the lowermost paper clip is a?

north pole

A positive ion has more

protons than electrons

What makes up a neutron?

quarks (protons too! 3 in each?)

Two life preservers have identical volumes, but one is filled with Styrofoam while the other is filled with sand. When the two life preservers are worn by swimmers so that one swimmer floats with a part of the preserver above water, and the other swimmer has sunk, the buoyant force is greater on the life preserver filled with?

sand (because it is more under the water than the Styrofoam)

A block of ice sliding down an incline has its maximum kinetic energy at?

the bottom!

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. The best explanation for this is that?

the milk carton has inertia

Which color of light carries the most energy per photon?

violet

A balloon is buoyed up with a force equal to the

weight of air it displaces

The force required to maintain an object at a constant velocity in free space (away form any gravity) is equal to

zero

You have 1 g of Iodine -134 which has a half life of 52 minutes. After 208 minutes how much sample is left?

1/16 208/52=4 52=1/2 104=1/4 156=1/8 208=1/16

A 1-kg ball is thrown at 10 m/s straight upward. Neglecting air resistance, the net force that acts on the stone when it is halfway to the top of its path is about?

10 N (1x10=10N / force by gravity=mg)

A wooden block has a mass of 1000 kg and a volume of 1 cubic meter. What is the block's density?

1000 kg per cubic meter (D=mass/volume)

The gain in speed each second for a freely-falling object is about?

10m/s (gravity)

The period of the hour hand on a clock is?

12 hours

Two charges separated by one meter exert 1 - N forces on each other. If the charges are pushed to 1/4 meter separation, the force on each charge will be?

16 N (Coulombs law. It squares)

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

40J (work=FD)

A bullet is fired horizontally with an initial velocity of 300 m/s from a tower 20 m high. If air resistance is negligible, the horizontal distance the bullet travels before hitting the ground is about

600 m solve for t plug it in

If a car accelerates from rest at 2 meters per second per second, its speed 3 seconds later will be about?

6m/s (2x3)

One lamp is in a circuit with a battery. A second lamp is connected in series with the first. How does the current in the circuit with two lamps compare to the current that one lamp had?

It's lower series: all connected / resistors lower the current

A block is pushed by a force of 6 N. It's acceleration is .5m/ss. What is the force of friction between the block and the surface?

Less than 6 N (because it's moving)

Bi-214 undergoes beta decay. What is the resulting nucleus?

Po

what element has the atomic number of 14?

Si (periodic table)

If an object falls a distance of 2 meters in its first second of fall, then 2 meters in its second, second of fall, and 2 meters during its third second of fall, then the acceleration of the falling object is?

ZERO m/s - not accelerating

If an object of constant mass experiences a constant net force, it will have a constant?

acceleration (F=ma)

Like kinds of magnetic poles repel while unlike kinds of magnetic poles

attract

A jumbo jet has a mass of 100,000 kg. The thrust for each of its four engines is 50,000 N. What is the jet's acceleration in meters per second per second when taking off?

2 (F=ma) 50x4(four engines)=200,000 200,000=100,000a a=2

A weight suspended from a spring bobs up and down over a distance of 1 meter in two seconds. Its frequency is?

.5 hertz (f=1/period)

A circus performer is diving into a bucket of water. Where does she have the greatest potential energy?

At the top of her descent

I have two synchronized atomic clocks. One is flown around the world on an airplane. When the clocks are brought back together they are a little out of sync. Which clock is ahead in time?

The one that remained on the ground

If the volume of an object were to double while its mass stays the same, its density would

halve (d=mv)

A kilogram is a measure of an objects?

mass

Refraction results from differences in light's _____ in different materials?

speed

Of all of the forces we have talked about, which is the strongest (at the same distance for same particles?)

the strong force (then electro-magnetic, and gravity)