SCEN101 Exam3

500N

In raising a 5000-N piano with a pulley system, for every 1 m of rope pulled down, the piano rises 0.1 m. Ideally, this means the force needed to lift the piano is

50 calories

Increasing the temperature of 50 grams of water by 1°C requires

half as high

Lifting a 100N load with 50N force lifts it

the same

Light is incident upon a pane of window glass at a particular angle. The angle of emerging light is

Perpendicular

Light will not pass through a pair of Polaroids when their axes are

10%

Machine puts out 100W of power for every 1000W put in, efficiency is

they have the same force

Mack truck & mini cooper traveling at same speed collide, collision force is greatest on

An electric and magnetic field

Moving electric charges will interact with

81.5%

Ninety-five percent of light incident on a mirror is reflected. How much light is reflected from seven mirrors in succession?

Europa

On which body (other than Earth) is life in our solar system most likely to be found?

remains unchanged

Rock is thrown upward at 50 degrees, as it rises in free fall, horizontal velocity

3N

Rock suspended by weighing scale is 14N out of water & 11N in water, buoyant force is

one reproducible experiment

Scientific hypothesis can be disproved with

energy

Simple machine cannot multiply

Parallel to the surface of the Earth

Tangential velocity is velocity

Venus

The planet with a mass most like Earth's is

Vertical

The polarization axes of ordinary sunglasses are

Liquids

The process of convection occurs in

8.38J are added

The temperature of water rises when 2.00 calories are added. It will rise the same when

6m/s

5,000kg car with speed of 2m/s crashes into 10,000kg car at rest, initial speed of 5,000kg car

Force/Mass ratio is the same for both

The reason a 10-kg rock falls no faster than a 5-kg rock in free fall is that the

sun's position

The reason that the Moon takes on a crescent shape each month has to do with the

Sun

The ultimate source of energy from fossil fuels is the

Expansions of metals

The usefulness of a bimetallic strip is due to differences in

Calories, joules or calories

Thermal energy can be measured in

Same in each

Two lamps, one with a thick filament and one with a thin filament, are connected in series. The current is greater in the lamp with the

50 degrees

W/o air resistance, ball tossed at angle of 40 degrees horizontally, what angle has same range

accelerate & curve

W/o air resistance, projectile fired horizontally 8km/s from mountaintop will

10 tons

What is buoyant force acting on 10-ton ship floating on fresh water lake

Red

When a pulse of white light is incident on a piece of glass, the first color to emerge is

Absorbed

When ice changes phase to become water, energy is

Earth

When the alignment of the Sun, the Moon, and Earth produce a lunar eclipse, the body that is in between the other two is the

Quadruples

When the distance between two charges is halved, the electric force between the charges

Violet

When white light goes from air into water, the color that refracts the most is

Decreases

When work is done by a system and no heat is added, the temperature of the system

twice as much work

When you push an object a certain distance while applying twice the force you do

Pressure on scale, weight isn't registered

When you stand on tiptoes on bathroom scale, there is an increase in

from your finger to the ice

When you touch a piece of ice with your finger, energy flows

zero

Whenever net force on an object is zero, its acceleration is

A blue-hot star

Which emits the highest frequency of radiation?

The Moon's rate of spin matches the rate at which the Moon revolves around Earth.

Which explanation best describes why Earth observers always see the same face of the moon?

they roll together at speed of 0.5m/s

-2 cars roll towards each other w/o friction, one car 2m/s & one car 1m/s

500N

-In raising 5,000N piano with pulley, every 1 meter of rope pulled piano rises 0.1 meters, force needed is

increases

2 objects move towards each other due to gravity, as they get closer force

both volume & weight of water

A fish normally displaces its own

pressure up on bottom is greater than on top

Buoyant force acts upward on submerged object because

16 times Kinetic Energy

Car moves 4 times as fast as identical car, compared to smaller car, the faster car has

the same

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

None of the above

Consider two planets in space that gravitationally attract each other. If the mass of both planets is doubled, and the distance between them is also doubled, then the force between them is

none of the above

To melt 50 g of 0°C ice requires

5m

A stone is thrown horizontally from the top of a cliff. One second after leaving your hand it drops a vertical distance of

same

2 planets are gravitationally attracted, mass and distance are doubled, force is the

1 m/s

A 10-kg block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block is

1053Hz

A 1056-Hz tuning fork is sounded when a piano note of higher pitch is struck. You hear three beats per second. What is the frequency of the piano string?

$2.20

A heater uses 20 A when used in a 110-V line. If electric power costs 10 cents per kilowatt hour, the cost of operating the heater for 10 hours is

Momentum

A heavy truck and a small truck roll down a hill. Neglecting friction, at the bottom of the hill the heavy truck has greater

2R

A length of wire has resistance R. The same wire twice as long has resistance

R/2

A length of wire has resistance R. Two of these same-length wires braided together have a resistance

Held in a hot flame or dropped on a hard surface

A magnet will become weaker if it is

A mixture of particle sizes

A whitish sky is evidence that the atmosphere contains

50%

An ideal Polaroid will transmit 50% of nonpolarized incident light. How much light is transmitted by two ideal Polaroids oriented with their axes parallel to each other?

air & pull on earth

As a ball falls, the action force is pull of Earth on ball, reaction force is

Pull of the ball's mass on Earth

As a ball falls, the action force is the pull of Earth's mass on the ball. The reaction force is the

weight of the atmosphere

Atmospheric pressure is caused by the

inertia

Dishes remain on table when tablecloth is pulled away, this demonstrates

11.2km/s

Escape speed from Earth is

2W

Exert 100J in 50s, your power output is

1W

Exert 1N for distance of 1 meter in 1 second, you deliver a power of

zero

Force required to maintain an object at constant velocity in free space is equal to

High Specific Heat Capacity

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

more than 45m/s(50m/s)

Freely falling object has downward speed of 40m/s, exactly 1 second its speed is

double

Given net force propels object along straight path, if net force is doubled, acceleration would

All frequencies

Glass in a florist's greenhouse blocks radiation of

recoiling gun

Gun made of lightweight material, pellet is more massive, firing speed is greater for

Joules and calories

Heat energy is measured in units of

6%

Height of 1.6m tall structure was measured to be 1.5, percent error is

4m/s^2

If a ball rolls down an inclined plane & picks up 4m/s each second, its acceleration is

18%

If a power plant is 30% efficient, and the transmission system that delivers power to consumers is 60% efficient, then the overall efficiency is

less

If air speed is greater along top surface of bird's wings, pressure of moving air there is

straight line path

If gravity between Sun and Earth vanished, Earth continues moving in

Momentum

If the running speed of Fast Freda doubles, what also doubles is her

Twice

If the same quantity of heat is added to both a 1-liter and a 2-liter container of water, the temperature change of water in the 1-liter container will be

Expands

If the temperature of a sample of 4°C water slightly decreases, the sample of water

An igloo

If you were caught in freezing weather with only a candle for warmth, you would be warmer in

meteorite but not a meteoroid

In a museum collection you can likely see a

5 yards/second

Nellie runs length of 100yd field in 20 second, her average running speed is

81%

Ninety percent of light incident on a certain piece of glass passes through it. How much light passes through two pieces of this glass?

-Pressure in a liquid depends on both density & depth

Pressure in a liquid depends on

1 second

Projectile fired straight up at 10m/s, no air resistance, what time until it reaches top

75 degrees

Projectile launched at angle of 15 degree above horizontal, what angle has same range

Reflected and Refracted

Rainbows exist because light is

force/mass ratio is the same

Reason a 10kg rock falls no faster than 5kg rock in free fall is

Beneath the straight-line path it would fall without gravity

The Moon falls toward Earth in the sense that it falls

12J

The amount of energy given to each coulomb of charge flowing through a 12-V battery is

electrons

The electric current in a copper wire is normally composed of

Speed

The explanation for all types of refraction involves a change in

Archimedes' principle.

The flight of a blimp best illustrates

Archimedes

The flight of the blimp test demonstrates

above the opening where expansion is prominent

The gush of steam that issues from the escape valve of a pressure cooker is relatively cool

Trace a curve that matches Earth's curvature, accelerate downward at g as it moves horizontally and returns to its starting position and repeat its falling behavior

Without air resistance, a projectile fired horizontally at 8 km/s from a mountaintop will