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# Physics

Myriam Morissette

Lvl 10
2021-10-09 18:34:52
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Cards in this guide (24)
A 12.0 rock slides off the edge of a bridge and falls into the water 25.0 meters below what is the kinetic energy as it hits the water

2,940

What term describes an educated guess about what the answer to a question might be

hypothesis
A hypothesis.

The custom of watching fireworks on the Fourth of July would be studied by this social science

a- Anthropology

A jogger runs at an average speed of 5 ms for 3 minutes then finishes with an average speed of 4 ms for 2 minutes What is his average speed in ms for the run

4.6ms

Which of these rates is slowest 1760 yardsminute 60 mihr or 88 ftsec

When you convert it, you will find out that they're all the same.

A 14 kg cart is coasting down a street at a steady speed of 7 ms what is the kinetic energy of the cart

Kinetic energy = 1/2 M V2 = 0.5 x 14 x 49 = 343 joules

The tangent of an angle equals the ratio of the

Sine of the angle to its cosine.

A 10 kg object has 500 joules of kinetic energy because of its speed How fast is the object traveling

10 m/s

A 10 kg object is lifted up 10 meters How much potential energy has the object gained

1,000

A 10 kg rock is pushed off the edge of a bridge 50 meters above the ground What was the kinetic energy of the rock before it began to fall

zero

A 10 kg rock is pushed off the edge of a bridge 50 meters above the ground what was the kinetic energy of the rock at the midway point of its fall

2450

A rock weighing 98 newtons is pushed off the edge of a bridge 50 meters above the ground What was the kinetic energy of the rock at the midway point of its fall

2,450 joules

A rock weighing 98 newtons is pushed off the edge of a bridge 50 meters above the ground What was the potential energy of the rock before it began to fall

4900

Look at the pie graph pictured How many students ate in the cafeteria

125

A 1600 kg car is traveling at a speed of 12.5 ms what is the kinetic energy of the car

KE = 1/2 M V2

= (1/2) (1,600) (12.5)2

= 125,000 kg-m2/sec2

= 125,000 newton-meters

= 125,000 joules.

What is the potential energy of a 50 newton object resting on the edge of a cliff 30 meters high

1500 joules

A 50 kg cannon ball is shot horizontally from a cannon at a speed of 80 ms At this speed its kinetic energy will be joules

Kinetic Energy = 1/2 M V2 = (25) (80)2 = 160,000joules.

As an object falls towards the ground what happens to the kinetic energy of the object

It gains kinetic energy because it is accelerating. Once it hits the ground, all of it's kinetic energy is converted different types of energy. Example: drop a rock from your head. When it hits the ground it create friction and there fore heat, heat is energy. It also makes a sound when it hits the ground, sound is energy. If you were to take the heat and the sound energy a d add them together, you would get the equal amount of potential energy the rock had when it was at your head ready to drop. Therefore, in this case, the kinetic energy was coverted to heat energy and sound energy.

As an object falls towards the ground what happens to the potential energy of the object

As an object falls from a higher level to a lower level, the gravitational potential

energy that it had at the higher level changes to kinetic energy.

As more and more potential energy changes to more and more kinetic energy,

the increase of kinetic energy shows up in the form of greater speed.

A ramp is 30 meters long and 5 meters high 200 newtons of force must be applied by the mover to push a 1000 newton piano up the ramp What is the amount of work done by the mover

What is the amount of work accomplished by the ramp? - 5000 joules

What is the amount of work done by the mover? - 6000 joules

What is the efficiency of the ramp? - 83%

A pulley system is used to lift a 2000 newton engine up a distance of 3 meters The operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor To lift the engine fi

250 newtons

What type of measurement is this 12 feet up scalar or vector

A scalar has distance but no direction.

A vector has distance and direction.

"12 feet up" has distance (12 feet) and direction (up), so is a vector.

What of these is always part of using the scientific method

A rock weighing 98 newtons is pushed off the edge of a bridge 50 meters above the ground. What was the kinetic energy of the rock before it began to fall

zero

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