Physics 1210 Final
For an action force, there must be a reaction force that
is exactly equal in magnitude
A 4 kg ball has a momentum of 12 kg m/s. What is the ball's speed?
3 m/s
If a rocket initially at rest accelerates at a rate of 50 m/s^2 for one minute, its speed will be
3000 m/s
What is the force of gravity on a 500 newton woman standing on the Earth's surface?
500 N
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, its speed 3 seconds later will be about
6 m/s
During an eclipse of the sun the Hugh ocean tides on Earth are
Extra high
Planets would crash into the sun if it weren't for
Their tangential velocities
Atoms heavier than helium were made by
Thermonuclear fusion
If you push an object twice as far while applying the same force, you do
Twice as much work
Which of these atoms has the most mass
Uranium
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
An Earth satellite is simply a projectile
freely falling around the Earth
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
Two objects move toward each other because of gravity. As the objects get closer and closer, the acceleration of each
increases
In each second of fall, the distance a freely falling object will fall is
increasing
A car moves 4 times as fast as another identical car. Compared to the slower car, the faster car has
16 times the KE
If the mass of an object does not change, a constant net fore 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
No force due to Earth's gravity is acting on the astronauts inside the orbiting space shuttle. This statement is
Always false
When properly used, a hydraulic press, like a wheel and axle, is capable of multiplying force input.
Always true
Nuclei of atoms that make up a newborn baby were made in
Ancient stars
The power required to exert 1 N force, over a distance of 1 m in 1 second is
1 W
The air in this room has
all of these
A hydraulic press, like and inclined plane, is capable of increasing energy
always false
Inside a freely falling elevator, there would be no
apparent weight for you
Inside a freely falling runaway elevator, your
apparent weight is zero
Eratosthenes learned about the position of the sun on June 22 by
consulting library information
What makes and element distinct?
the number of protons
A "weightless" astronaut in an orbiting shuttle is
Like the shuttle, pulled by Earth's gravitation
Which of the following is not a vector quantity?
Speed
The smallest particle of those listed below is
a quark
If the sun were twice as massive
both of these
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 towards the water. Neglecting air resistance, the acceleration just before striking the water
is the same for each bullet
A rifle recoils while firing a bullet. The speed of the rifle's recoil is small because the
rifle has much more madd than the bullet
A projectile is fired vertically from the surface of the Earth at 8 km/s. The projectile will
rise and fall back to the Earth's surface
Two factors that greatly affect air resistance on falling objects are the
size and speed of the object
An asteroid exerts a 360 N gravitational force on a nearby spacecraft. The force is directed
toward the asteroid
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 were somehow equipped with a speedometer, its speed reading would increase each second by about
10 m/s
If the Earth's mass decreased to one half its original mass with no change in radius, then your weight would
decrease to one half your original weight
A bullet fired horizontally over level ground hits the ground in 0.5 second. If it had been fired with twice the speed in the same direction, it would have hit the ground in
0.5s
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 frictionless surface. The speed of the putty thereafter is
1/6 m/s
A 10 kg brick and a 1 kg book are dropped in a vacuum. The force of gravity on the 10 kg brick is
10 times as much
A machine puts out 100 watts for every 1000 watts put into it. The efficiency of the machine is
10%
A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange will the bullet be 1 second later
100
The force of friction on a sliding object is 10N. The applied force needed to maintain a constant velocity is
10N
An airplane that flies at 100 km/h in a 100 km/h hurricane crosswind has a ground speed of
141 km/h
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 when taking off?
2
Do 100 J of work in 50s and your power output is
2 w
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 in 0.1 second when it hits a tree. What is the deceleration in meters per second of the car?
220
A bow is drawn so that it has 40 J of potential energy. When fired, the arrow will ideally have a kinetic energy that is
40 J
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
A stone is thrown horizontally from the top of a cliff. One second after it has left your hand, its vertical distance below the tip of the cliff is
5 m
A 2kg mass is held 4 m above the ground. What is the approximate potential energy of the mass with respect to the ground?
80 J
A rock is thrown vertically into the air. At the tip of its path, its acceleration in meters per second is
9.8
After rolling halfway down an incline, a marble's kinetic energy is
A same as its potential energy
Disregarding air resistance, objects fall with constant
Acceleration
Which of the following is not a compound?
Air
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
Padded dashboards in cars are safer in an accident than nonpaodded ones because an occupant hitting the dash has
Increased time of impact
Suppose the moon had twice as much mass as it now does and still orbited the Earth at the same distance. In that case, the ocean bulges on Earth would be
Larger
A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, neglecting air drag, its horizontal component of velocity
Remains unchanged
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
In science, a theory is
a synthesis of a large body of well tested knowledge
A skydiver of mass 100 kg experiences air resistance of 500 N and an acceleration of
about 0.5 g
A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation of 5 m above the ground. The player sees the ball land 20 m down range. What is the player's pitching speed?
about 20 m/s
The Doppler effect is characteristics of
all of the above choices
An object in mechanical equilibrium is an object
all of these
Compared to a 1 kg block of solid iron, a 2 kg block of solid iron has twice as much
all of these
Which has zero acceleration? An object
all of these
If no external forces are acting on a moving object, it will
continue moving at the same velocity
A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises neglecting air drag, its vertical component of velocity
decreases
A skydiver jumps from a high flying plane. As her velocity of fall increases, her acceleration
decreases
The two measurements necessary for calculating average speed are
distance and time
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
An object may have potential energy because of its
location
A force is a vector quantity because it has both
magnitude and direction
A kilogram is a measure of an object's
mass
Twelve seconds after starting from rest, an object falling freely will have a speed of
more than 100 m/s
The reason a granite block is mostly empty space is that the atoms in the granite are
mostly empty space themselves
Which of the following are electrically neutral?
neutron
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
Starting from rest, the distance a freely falling object will fall in 0.5 second is about
none of the above
A light aluminum ball and a heavy lead ball of the same size are allowed to roll down an incline. When they are halfway down the incline, they will have identical
none of the above choices
Of the sciences known as physics, chemistry, and biology, the most basic is
physics
Which has the greater kinetic energy, a car traveling at 30 km/hr or a car of half the mass traveling at 60 km/hr?
the 60 km/hr
Your weight is
the gravitational attraction force between you and the Earth
Which is most responsible for the ocean tides
the moon
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
Compared to the atoms that make up the body of an elderly person, the atoms that make up the body of a newborn baby are
the same age
A 1000 kg car and a 2000 kg car are hoisted the same distance. Raising the more massive car requires
twice as much work
How many different elements are in a water molecule
two
If you find that twice as much work is needed to perform a task but it takes twice as much time, the amount of power required is
unchanged
While an object near the Earth's surface is in free fall, its
velocity increases
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