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
