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