Physics 1210 Final Review
A horse gallops a distance of 10 kilometers in a time of 30 minutes. Its average speed is
20 km/h
A car traveling at 22 m/s comes to an abrupt halt on 0.1 second when it hits a tree. What is the deceleration in meters per second per second of the car?
220
A 4 kg ball has a momentum of 12 kg m/s. What is the balls speed?
3 m/s
If a rock initially at rest accelerates at a rate of 50 m/s^2 for one minute, its speed will be
3000 m/s
If the mass of an object does not change, a constant net force on the object produces 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
if the frequency of a certain wave is 10 hertz, its period is
0.1 second
which could burn a boy scout the most
100 g of steam at 100 degrees C
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
A 10-N falling object encounters 4 N of air resistance. The net force on the object is
6 N
If a car accelerates from rest at 2 meters per second per second, it speed 3 seconds later will be
6 m/s
A rock is thrown vertically into the air. At the top of its path, its acceleration in meters per second per second is
9.8
Starting from rest, the distance a freely falling object will fall in 0.5 seconds is about
None of the above (not 1 m, 10 m., or 1.00 m.)
the fact that desert sand is very hot in the day and very cold at night is evidence that sand has
a low specific heat
near the top of a mountain, water in an open pot boils at
a lower temperature that at sea level
a good heat conductor is
a poor insulator
In science, a theory is
a synthesis of a large body of well-tested knowledge
a standing wave occurs when
a wave reflects upon itself
A skydiver of mass 100 kg experiences air resistance of 500 N, and an acceleration of
about 0.5 g
objects that radiate relatively well
absorb radiation relatively well
Disregarding air resistance, objects fall with constant
acceleration
Like a transverse wave, a longitudinal wave has
amplitude, frequency, wavelength and speed
Which has zero acceleration? An object
at rest, moving at constant velocity, in mechanical equilibrium
An object in mechanical equilibrium is an object
at rest; moving with constant velocity; having no acceleration
the vibrations of a transverse wave move in a direction
at right angles to the direction of wave travel
if you want to cook eggs by boiling them while in the mountains, them compared to sea level cooking, you should
boil the eggs for a longer time
heat energy is measured in units of
calories and joules
we feel uncomfortably warm on a muggy day because water molecules are
condensing on our bodies
Erasthothenes learned about the position of the sun on June 22 by
consulting library information
If no external forces are acting on a moving object, it will
continue moving at the same velocity
Suppose a particle is being accelerated through space by a 10-N force. Suddenly the particle encounters a second force of 10 N in the opposite direction from the first force. The particle with both forces acting on it
continues at the speed it had when it encountered the second force
substances that absorb heat energy by the process of
convection, conduction and radiation
A skydiver jumps from a high-flying plane. As her velocity of fall increase, her acceleration
decreases
as a piece of metal with a hole in it cools, the diameter of the hole
decreases
warm air rises because faster-moving molecules tend to move to regions of less
density and less pressure
The two measurements necessary for calculating average speed are
distance and time
when heat is added to boiling water, its temperature
does not change
A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is
doubled
to turn ice at zero degrees Celsius to water at zero degrees Celsius, we must add
energy
hot water has a relatively high rate of
evaporation
energy transfer buy convection is primarily restricted to
fluids
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
The newton is a unit of
force
the pitch of a musical sound depends on the sound wave's
frequency
when you touch a cold piece of ice with your finger, energy flows
from your finger to the ice
the molecules in a room-temperature glass of water jostle around at
great variety of speeds
An object is propelled along a straight-line path in space by a force. If the mass of the object somehow becomes twice as much, its acceleration
halves
steam burns are more damaging than burns caused by boiling water because steams
has more energy per kilogram than boiling water and gives up additional energy when it condenses
As we grow older, we have the greatest difficulty hearing frequencies that are
high
the moderate temperature of islands throughout the world has much to do with water's
high specific heat
Padded dashboards in cars are safer in an accident than nonpadded ones because an occupant hitting the dash has
increased time of impact
In each second of free fall, the distance a freely falling object will fall is
increasing
which of the following normally warms up fastest when heat is applied
iron
your feet feel warmer on a rug than on a tile floor because a rug
is a better insulator than tile
For an action force, there must be a reaction force that
is exactly equal in magnitude
Ice has a lower density that water because ice
is made of open-structured, hexagonal crystals
A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun, straight down toward the water. Neglecting air resistance, the acceleration just before striking the water
is the same for each bullet
compression and rarefaction are characteristic of
longitudinal waves
a substance that heats up relatively quickly has a
low specific heat
A force is a vector quantity because it has both
magnitude and direction
A kilogram is a measure of an object's
mass
Compared to a 1 kg block of solid iron, a 2 kg block of solid iron has twice as much
mass, volume, inertia
Twelve seconds after starting from rest, an object falling freely will have a speed of
more than 100 m/s
if you push for a half hour or a whole hour against a stationary wall
no work on the wall is done in either case
we are best at hearing
none of the above choices are correct (ultrasonic, infrasonic, or both)
Of the sciences known as physics, chemistry, and biology, the most basic is
physics
a sound source of high frequency emits a high
pitch
the planet earth loses heat mainly by
radiation
which doesn't belong to the same family?
radio waves
when a gas is changed to a liquid state, the gas
releases energy
when you tune a radio to a certain station, you match the frequency of the internal electrical circuit to the frequency of the wanted radio station. In doing so you are employing the principle of
resonance
A rifle recoils while firing a bullet. The speed of the rifle's recoil is small because the
rifle has much more mass than the bullet
Two factors that greatly affect air resistance on falling objects are the
size and speed of the object
which of the following is not a transverse wave
sound
sound travels faster in
steel
a factor that usually determines whether a substance is in the solid, liquid, gaseous, or plasma state is its
temperature
heat energy travels from an object with a high
temperature to an object with a lower temperature
Your weight is
the gravitational attraction force between you and the earth
A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that:
the milk carton has inertia
A ball is thrown upwards and returns to the same position. Compared with its original speed after release, its speed when it returns is about
the same
Compared to the mass of a certain object on earth, the mass of the same object on the moon is
the same
the higher the temperature of an object
the shorter the wavelength it radiates
We are warmed by condensation because water molecules in the air that strike our bodies
transfer some of their kinetic energy to us
While an object near the earth's surface is in free fall, its
velocity increases
a common source of wave motion is a
vibrating object
A wiggle in time is a
vibration
during a very cold winter, water pipes sometimes burst. The reason for this is
water expands when freezing
The Doppler effect is the characteristic of
water, light and sound waves
water interference occurs for
water, light and sound waves
double the frequency of a sound and you halve its
wavelength
sound will be louder if a struck tuning fork is held
with its base against a table top
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
When a falling object has reached its terminal velocity, its acceleration is
zero
a weight is suspended from a spring bobs up and down over a distance of 1 meter in two seconds. Its frequency is
0.5 Hertz
A 1-kg chunk of putty moving at 1 m/s collides with and sticks to a 5 kg bowling ball that is initially at rest on a friction-less surface. The speed of the putty thereafter is
1/6 m/s
The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is
10 N
An apple falls from a tree and hits the ground 5 meters below. It hits the ground with a speed of about:
10 m/s
If a freely falling object where somehow equipped with a speedometer, its speed reading would increase each second by about
10 m/s
A 10 kg brick and a 1 kg book are dropped in a vacuum. The force of gravity on the 10 kg bricks is
10 times as much
A man weighing 800 N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale is
400 N
