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# Physics

Roslyn Walter

Lvl 10
2021-10-13 18:34:54
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Cards in this guide (28)
What is the mechanical advantage of a simple machine that requires a force of 40 newtons input to lift a 200 newton object

The answer is 5. To find mechanical advantage, divide the force required by the force given.

200/40 = 5

Four students are moving 80 N boxes from the floor to a shelf 4 meters high Student A moves 8 boxes in 10 minutes Student B moves 6 boxes in 8 minutes Student C moves 4 boxes in 6 minutes and st

student A

How much heat energy is needed to convert 50 kg of water at 80 degrees Celsius to steam at 100 degrees Celsius

117,180,000

A bottle cap opener is an example of what type of simple machine

A lever.

Newton's Second Law of Motion states that when an unbalanced force acts on an object the object decelerates

It can accelerate or decelerate, depending on the direction of force

A man is carrying cement blocks weighing 200 newtons up a ladder to a platform 7 meters above the ground He has been carrying 2 blocks per minute How much work is done in 10 minutes

28,000 J

A hammer is used to pull a nail from a piece of wood How could the hammer be modified to make the task easier

Make The Handle Longer

A bicycle is an example of what machine

A bicycle is an example of a complex machine, consisting of interacting simple machines.

A man and a woman exert a total of 900 N by pushing a car 20 meters across the street The man exerts twice as much force as the woman How much work does the man do

The man exerts a force of 600 N and the woman exerts a force of 300 N. Work done by the man = Force x displacement = 600 x 20 = 12,000 J Hence, the man performs 12,000 joules of work.

What factor prevents a machine from operating at 100 percent efficiency

Friction((:

A ramp is 30 meters long an 5 meters high 200 newtons of force must be applied by the mover to push 1000 newtons piano up the ramp what is the mechanical advantage of the ramp

5

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

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 potential energy of the rock before it began to fall

4900

A 60 kg box is pushed horizontally across the floor a distance of 20 meteres The force required is 15 N In this effort how many joules of work is done

Work done = Force x distance moved in the direction of force

So work done = 15 x 20 = 300 joule

That force 15 newton would be the necessary and equivalent force to overcome the static frictional force. Static frictional force depends, of course, on the mass of the box.

Pulley system is used to lift 2000 newton and a distance of 3 meters the operator must apply a force of 250 N and to lift engine 3 meters the operator must pull a total 30 meters what is the valueofdi

30 meters

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 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%

How much heat energy would it take to melt a 20 kg block of lead that was at 24 degrees Celsius

1,277,800 j

This term is the center of interest for an artwork

Focal Point for my A+ buddies ;p

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 accomplished by the ramp

5,000 joules

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

What is the value of Wi?

7,500 joules

How many joules of work are done when a 20 newton box is lifted 5 meters off of the floor

100

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

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 efficiency of the ramp

5,000

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. value of fo

What is the value of fo?

2000 newtons

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. mechanical advantage

8

What would be the final temperature if you mixed a liter of 30 degrees celsius water with 1 liters of 50 degrees celsius water

40 degrees

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