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# Physics

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Cards in this guide (21)
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

The upper range of human hearing is approximately

20000 Hz

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.

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.

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 question about an observation

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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