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# Physics Lvl 10
2021-10-09 18:35:04
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Cards in this guide (22)
A 3000 kg freight train traveling at a rate of 2 ms strikes a stationery 3000 kg freight car and couples up What is the speed of the 2 cars as they move together after the collision

Don't know how I found that could someone help me with the math?

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

A sailor pulls a 2000 kilogram boat 25 meters along the dock with a rope attached to the boat that makes a 45 degree angle with the dock. How much work is done by the sailor if he exerts a force of 4

7,071 J

An isolated system is one which is not subject to any forces

external

Which of these changes as the momentum of an object changes

Mass

A bicycle is an example of what machine

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

What factor prevents a machine from operating at 100 percent efficiency

Friction((:

The value of the impulse equals the force x the

The value of the impulse equals the the force times the time.

A player kicks a soccer ball from ground level and sends it flying at an angle of 30 degrees at a speed of 26 ms What is the maximum height attained by the ball

10.7

V-cube 7 or megaminx

megaminx

What is the force applied over a period of time that is required to give a stationary object momentum

Inertia

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%

All moving objects have momentum

Any moving object with mass has momentum, since p = mv, where p is momentum, m is mass, and v is velocity.

The momentum of two objects before collision is the same as the momentum of the two objects after collision

Yes. The total momentum would be the same. This is an example of the conservation of linear momentum.

A golfer tees off and hits a golf ball at a speed of 31 ms and at an angle of 35 degrees What is the vertical velocity component of the ball

17.8 m/s

A golfer tees off and hits a golf ball at a speed of 31 ms and at an angle of 35 degrees what is the horizontal velocity component of the ball

25.4

What does a force applied to a stationary object give the object

"Motion" or "Momentum"

What does the amount of force times the time applied equal

impulse

A player kicks a soccer ball from ground level and sends it flying at an angle of 30 degrees at a speed of 26 ms What is the vertical velocity component of the ball to the nearest ms

13

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 golfer tees off and hits a golf ball at a speed of 31 ms and at an angle of 35 degrees How long was the ball in the air Round the answer to the nearest tenth of a second

3.6

A player kicks a soccer ball from ground level and sends it flying at an angle of 30 degrees at a speed of 26 ms

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