Final
A projectile is thrown into the air at an angle of 50° and lands on a target that is at the same level the projectile started. It will also land on the target if it is thrown at an angle of
40°
Two equal charges will exert equal forces on each other. What if one charge has twice the magnitude of the other-how do the forces they exert on each other compare?
The size of the forces exerted on each other will be equal.
A cup of hot chocolate with a temperature of 40°C is placed inside a refrigerator at 5°C. An identical cup of hot chocolate at 90 °C is placed on a table in a room at 25 °C. A third identical cup of hot chocolate at 80 °C is placed on an outdoor table, where the surrounding air has a temperature of 0 °C. For which of the three cups has the most energy been transferred as heat when equilibrium has been reached?
The third cup has the largest energy transfer.
Whenever the net force on an object is zero, its acceleration
is zero
If we double the frequency of a vibrating object, what happens to its period?
it is reduced by ½
The fact that desert sand is very hot in the day and very cold at night is evidence that sand has a
low heat capacity
Radio waves are able to diffract around buildings, but light waves can not. Radio waves have _?_ compared to light waves.
lower frequency and longer wavelengths
A kilogram is a measure of an object's
mass
A device that changes electrical energy into mechanical energy is a/an _?
motor
Compared to an elephant, a woman wearing high heels exerts on the ground
much more pressure than the elephant
The isotopes of Carbon-12 and Carbon-14 differ in their number of _?_.
neutrons
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
If you rub a balloon on your hair, you can generate several thousand volts. This is not dangerous though because _?_.
the amount of charge involved is small so the energy involved is small.
Compared to the air, the speed of sound in a vacuum is
zero
The lowest temperature possible in nature is
-273°C
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
0 N
What is the acceleration of a car that maintains a constant velocity of 100 km/h for 10 s?
0 m/s^2
Exert 100 J in 50 s and your power output is
2 W
How many grams of sucrose are there in 5 liters of an aqueous solution of sucrose having a concentration of 0.5 gram of sucrose per liter of solution?
2.5 grams
The average speed of a horse that gallops a distance of 10 km in a time of 30 min is
20 km/h
A girl pulls on a 10-kg wagon with a constant force of 30 N. What is the wagon's acceleration in meters per second per second?
3.0
An object is pulled northward with a force of 10 N and southward with a force of 15 N. The magnitude of the net force on the object is
5 N
A stone is thrown horizontally from the top of a cliff. One second after it has left your hand its vertical distance below the cliff is
5 m
A spring-powered nerf dart gun is pulled back so that it has 50 J of potential energy. When fired, the dart should have a kinetic energy of
50 J
A 2-kg mass is held 4 m above the ground. What is the approximate potential energy of the mass with respect to the ground?
80 J
When a plastic comb is rubbed on rabbit fur, the rabbit fur becomes more positively charged because _?_.
Electrons are transferred from the rabbit fur to the comb.
A metal spoon is placed in one of two identical cups of hot coffee. Why does the cup with the spoon have a lower temperature after a few minutes?
Energy is removed from the coffee by conduction through the spoon.
The correct formula for the compound dihydrogen monoxide is _?_.
H2O
In the following reaction, which reactant acts as an acid? H2PO4 + H2O ↔ H3O+ + HPO4-
H2PO4
The impulse-momentum relationship is a direct result of
Newton's second law
Which have the longest wavelengths?
Radio waves
During a cold spell, Florida orange growers often spray a mist of water over their trees during the night. Why is this done?
The large heat of fusion of water keeps the trees from freezing.
What must be true about two given objects for energy to be transferred as heat between them?
The objects must have different temperatures.
If you walk across a rug and scuff electrons from your feet: which of the following is true?
The rug has a negative charge and you have a positive charge.
An Earth satellite is simply a projectile freely falling around the Earth
True
A much larger Mack truck and a Volkswagen traveling at the same speed have a head-on collision. The vehicle to undergo the greatest change in velocity will be the
Volkswagen
It is warmer inside the shower stall compared to outside after a warm shower because _?
a higher amount of condensation is occurring there which is a warming process and raises the temperature.
Disregarding air resistance, objects fall at constant
acceleration
Hang from a pair of gym rings and the upward support forces of the rings will always
add up to equal your weight
Which of these do not emit radiant energy?
all of the above emit radiant energy
Which of the following heated materials would melt more ice if the same mass of each had the same initial temperature?
aluminum, specific heat = 899 J/kg °C
A sound with the same pitch, but is noticeably louder must have a larger
amplitude
A sonic boom from an aircraft can be heard
any time after the aircraft has exceeded the speed of sound.
Pressure is the ratio of force to
area
An object in mechanical equilibrium is an object
at rest, moving with constant velocity, or having no acceleration
A heavy object and a light object are dropped at the same time from rest in a vacuum. The heavier object reaches the ground
at the same time as the lighter object
A device that measures atmospheric pressure is a
barometer
Which of the photons listed below has the most energy?
blue
Which has more atoms? 17.031 grams NH3 or 72.922 grams HCl
both have the same number
Suppose you're coasting in a car at 60 km/h and apply the brakes until you slow to 40 km/h. When you suddenly release the brake, the car tends to
continue moving at 40 km/h in the absence of other forces
If a flight mechanic drops a wrench from a high flying jumbo jet, it crashes to the earth. If an astronaut on the orbiting space station drops a wrench it will
continue orbiting the earth
Heat is sometimes lost from a house through cracks around windows and doors. What type of heat transfer is involved?
convection
When more lamps are added to a series circuit, the light intensity of each lamp will _?_.
decrease
The critical angle is least in which of the following?
diamond
The two measurements necessary for calculating average speed are
distance and time
When gas in a container is squeezed to half its volume and the temperature remains the same, the gas pressure
doubles
Which force binds atoms together to form molecules?
electrical
A truck is moving at constant velocity. Inside the storage compartment, a rock is dropped from the midpoint of the ceiling and strikes the floor below. The rock hits the floor
exactly below the midpoint of the ceiling
A satellite orbiting the earth travels slowest when it is
farthest from the earth
Compared to the air, the speed of sound in water is
faster
If you push as object four times as far while applying the same force, you do
four times as much work
The aspect of sound that "pitch" best corresponds to is _?
frequency
When a light or sound source moves toward you, there is an increase in
frequency
Color depends on what characteristic of light?
frequency and wavelength
If the frequency of sound waves increases, the sound you hear will be _?
higher
Increasing the number of loops in an electromagnet would _?_ the voltage induced.
increase
If wavelength decreases, frequency _?
increases
In each second of fall on earth, the distance a freely falling object will fall is
increasing
Ultraviolet rays have a higher frequency compared to infrared. Which has longer wavelengths?
infrared
Light has both a wave nature and a particle nature. Light behaves primarily as a particle when it _?
interacts with matter
When an iron ring is heated, the hole becomes
larger
Before boarding an airplane, you buy a bag of chips and while in flight, you notice that the bag is puffed up. This indicates that compared to the air inside the bag, the air pressure outside the bag is
less
A "weightless" astronaut in an orbiting shuttle is
like the shuttle, pulled by Earth's gravitation
The frequencies of sound that carry farther in air are relatively
low
Compared with a 1-kg block of solid iron, a 2-kg block of solid iron has the same
not weight, volume, or mass
The force of gravity acts on all apples on an apple tree. Some apples are twice as far from the ground as others. These twice-as-high apples, for the same mass, have
practically the same weight
When liquids change to a solid phase, they
release energy
A rock is thrown upward at 50° with respect to the horizontal. As it rises, its horizontal component of velocity
remains unchanged
A car traveling at 80 km/h strikes a butterfly with the windshield. The force of impact is greater on the
same for both
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, acceleration is greatest for the
same for each
The color of a red rose is due to
selective reflection
Lenses work because, in different materials, light has different
speeds
An object weighs 30 N on Earth. A second object weighs 30 N on the Moon. Which has the greater mass?
the one on the Moon
Electrons in glass absorb energy from ultraviolet light. The natural frequency of these electrons is _?_ the frequency of ultraviolet light.
the same as
Suppose you are swimming 2 meters below the surface at the LaPorte City Aquatic Center. At the same time, a close friend is swimming 2 meters below the surface of Lake Superior. You will feel
the same pressure as your friend
In order to catch a ball, a baseball player extends the hand forward before impact with the ball and then lets it ride backward in the direction of the ball's motion upon impact. Doing this reduces the force of impact on the players hand principally because the
time of impact is increased
A piece of red glass appears red because it
transmits red
An object is propelled along a straight line path by a force. If the net force were tripled, its acceleration would
triple
Since the cornea of the eye is an example of a converging lens, images on the retina are _?_.
upside down
As an object freely falls, its
velocity increases
At 100,000 Ω, how much current will flow through your body if you touch the terminals of a 12-V battery?
0.00012 A
How much current flows through a lamp with a resistance of 60 Ω when the voltage across the lamp is 12 V?
0.2 A
Gusts of wind cause the Willis Building in Chicago to sway back and forth, completing a cycle every ten seconds. What is its frequency?
1/10 Hz
If you wish to take a picture of your image while standing 5 m in front of a plane mirror, for what distance should you set your camera to provide the sharpest focus?
10 m
The gain in speed each second for a freely falling object on earth is about
10 m/s
A 3000 N bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is
3000 N
Radiation from a point source obeys the inverse-square law. If a Geiger counter 1 meter from a small sample reads 360 counts per minute, what will be its counting rate at 3 meters from the source?
40
The element bromine, Br (atomic number 35), has two major isotopes of similar abundance, both approximately 50 percent. The atomic mass of bromine is reported in the periodic table as 79.904 atomic mass units. Choose the most likely set of mass numbers for these two bromine isotopes:
79Br, 81Br
Electrical and gravitational force both _?_.
decrease when distance between particles increase
Ice has a lower density than water because ice
is made of open-structured, hexagonal crystals
