ISCI Final Exam
Ten seconds after starting from rest, a freely falling object on Earth will have a speed of about
100 m/s
A baseball player bats a ball with a force of 1000 N. The ball exerts a reaction force of
1000 N
The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is
10N
A car moving at 50 km/hr skids 20 m with locked brakes. How far will the car skid with locked brakes if it is traveling at 150 km/hr?
180 m
A jumbo jet has a mass of 100,000 kg. The thrust for each of the four engines is 50,000 N. What is the jet's acceleration in meters per second square when taking off?
2
A floating leaf oscillates two complete cycles each second as a water wave passes by. What is the wave's frquency?
2 Hx
If you exert 100 J in 50 seconds your power output is
2 W
The average speed of a horse that gallops a distance of 10 km in a time of 30 minutes is
20 km/hr
A leaf oscillates up and down two complete cycles in 1 second as water passes by. The waves wavelength is 10 m. What is the wave's speed?
20 m/s
A car has a mass of 1000kg and accelerates at 2 m/s/s. What is the magnitude of the force exerted on the car?
2000 N
A skipper on a boat notices wave crests passing the anchor chain every 5 seconds. He estimates the distance between the crests in 15 m. What i the speed of the water waves?
3 m/s
A 300 kg bear grasping a vertical tree slides down at a constant velocity. The friction force between the tree and the bear is
3000 N
A lever is used to move an object with a weight of 20 N. What is the mechanical advantage of the lever if the effort force is 5 N?
4
In a complex pulley system, a weight of 100 N is being lifted with 4 supporting ropes. The ideal mechanical advantage of this system is
4
A bow is drawn so that it has 40 J of potential energy. When released, the arrow will ideally have a kinetic energy of
40 J
A 100 N weight is being moved to a vertical height of 2 m by using a ramp that is 10 m long. What is the ideal mechanical advantage of the ramp?
5
An object is pulled north with a force of 10 N and south with a force of 15 N. The magnitude of the net force on the object is
5 N
A person is attracted toward the center of the earth by a 500-N gravitational force. The force of attraction of the earth toward the person is
500 N
A skydiver who weighs 500 N reaches terminal velocity of 90 km/hr. The air resistance on the skydiver is then
500 N
What is the force of gravity on a 500 N woman standing on earths surface?
500 N
A block is dragged without acceleration in a straight line oath across a level surface by a force of 6 N. What is the force of friction between the block and the surface?
6 N
If a car increases its velocity from 0 to 60 km/hr in 10 seconds, its acceleration is
6 km/hr/s
The weight of 0.6 kg of salami is about
6.0 N
A 60 vibration per second wave travels 30 m in 1 second. Its frequency is
60 Hz and it travels 30 m/s
Any machine that multiplies force does so at the expense of
distance
The two measurements necessary for calculating average speed are
distance and time
An object is placed exactly halfway between earth and the moon. The object will fall toward the
eart
When graphing data, the point at which the X and Y axes meet must always be labeled as 0
false
A player hits a ball with a bat. The action force is the impact of the bat against the ball. The reaction to this force is the
force of the ball against the bat
A car that travels twice as fast as another when braking to a stop will skid
four times as far
When you touch a cold piece of ice with your finger, energy flows
from you finger to the ice
The higher the mechanical advantage of a simple machine, the __ the input force is multiplied
greater
If a freely falling object were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be
greater than the second before
According to Newton, the greater the masses of interacting objects, the
greater the gravitational force between them
According to Newton, the greater the masses of interaction objects, the
greater the gravitational force between them
compared to a giant iceberg, a hot cup of coffee has
high temperature but less thermal energy
If the mass of earth somehow increased with no change in radius, your weight would
increase also
If an object's mass is decreasing while a constant force is applied to the object, the acceleration
increases
When the distance between two stars decreases by half, the force between them
increases to four times as much
Heat energy is measured in
joules and calories
If you stake out a plot of land with a steel tape on a hot day, the amount of land you will have will be
larger
Sand heats up faster during the day than water-filled plants and vegetation. This indicates the specific heat for sand is
less than that of plants
According to Newton, the greater the distance between masses of interaction objects, the
less the gravitational force between them
An object that has potential energy may have this energy because of its
location
Relative to ultraviolet waves, the wavelength of infraread waves is
longer
A sound wave is a
longitudinal wave
Compressions and rarefactions are characteristic of
longitudinal waves
A substance that heats up relatively quickly has a
low specific heat
A kilogram is a measure of an object's
mass
If you want to move a very heavy mass with a lever
move the fulcrum closer to the heavy mass
An object with kinetic energy must be
moving
A sound source of high frequency emits a high
pitch
The color of an opaque object is the same as the light that is
reflected
A refrigeration does what to thermal energy
removes thermal energy from inside the refrigerator
Shattering a glass with your voice is a demonstration of
resonance
When ultraviolet light is incident upon glass, atoms in the glass
resonate
A car traveling at 100 km/hr strikes a a bug and splatters it. The force impact is greater on the
same for both
A large truck and a small car traveling at the same speed have a head on collision. The impact force is greater on the
same for both
You dip your finger into water and make waves. If you dip your finger more frequently, the wavelength of the waves
shortens
A large truck and small car traveling at the same speed have a head-on collision. The vehicle to undergo the greatest change in velocity is the
small car
Which has greater kinetic energy, a car traveling at 30 km/hr or a car of half that mass traveling at 60 km/hr?
the 60 km/hr car
A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This demonstrates that
the milk carton has inertia
As a ball falls, the action force is the pull of Earth's mass on the ball. The reaction force is
the pull of the ball's mass on Earth
A 50-kg sack is lifted 2 m in the same time as a 25-kg sack is lifted 4 m. The power expended in raising the 50-kg sack compared to the 25-kg sack is
the same
Compared with the mass of a certain object on earth, the mass of the same object on the moon is
the same
Which requires more work; lifting a 50-kg sack vertically 2 m or lifting a 25 kg sack vertically 4 m?
the same
An investigation was performed to see if corn seeds would sprout at different times depending on the temperature of the water in which they were placed. Identify the dependent variable in this experiment
the sprouting time
A heavy object and a light object are dropped at the same time in a vacuum. The heavier object reached the ground
at the same time as the lighter object
Two people pull very hard on opposite ends of a rope. The greatest force on the rope is exerted by
both the same
Simple machines allow us to
change the direction of a force and multiply the force
Aluminum has a specific heat more than twice of copper. Place equal masses of aluminum and copper wire in a flame and the one to undergo the fastest increase in temperature will be
copper
When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. The reason for this is
copper expands more than iron
What is the definition of the term mass?
The amount of material contained within an object.
A light woman and a heavy man jump from an airplane at the same time and open their same-size parachute at the same time. Which person will get to a state of zero acceleration first?
The light woman
Sound waves cannot travel in
a vacuum
Disregarding air resistance, objects fall at constant
acceleration
The vibrations of a longitudinal wave move in a direction
along the direction of wave travel
An object on which the sum of all the forces is zero is an object
at rest, moving with constant velocity, and has no acceleration
The vibrations of a transverse wave move in a direction
at right angles to the direction of wave travel
A 1-kg mass at earth's surface weighs about
10 N
If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by about
10 m/s
A 10-N falling object encounters 10 N of air resistance. The net force on the object is
0 N
An object travels 8 m in the first second, 8 m in the second second and 8 m in the third second. Its acceleration is
0 m/s/s
If the frequency of a certain wave is 10 Hz its period is
0.1s
Ideal mechanical advantage takes into account the forces of friction. T/F?
False
Temperature is a measure of the total kinetic energy in a substance. T/F?
False
In a tug of war, Arnold wears socks and Susie wears gym shoes. The likely winner is
Susie
When a squid pushed against the war, the squid moves forward because
the water pushed against the squid
The Doppler effect occurs when a source of sound moves:
toward and away from you
A 1000-kg car and a 2000-kg car are hoisted the same direction in a gas station. Raising the more massive car requires
twice as much work
If you push an object twice as far while applying the same force, you do
twice as much work
If you do work in half the time, you power output is
twice the usual power output
The natural frequency of the atoms in glass in in the
ultraviolet part of the spectrum
As an object freely falls, its
velocity increases
While a car travels around a circular track at constant speed, its
velocity is increasing
Sound travels faster in air if the air is
warm
When graphing data, the independent variable should be placed on the
x axis
The complementary color of blue is
yellow
The brightest color emitted by the sun is
yellow-green
When a falling object has reached its terminal velocity, its acceleration is
zero
