Physics Middle School

Why can a crane lift extremely heavy loads?

A. The crane uses gears to reduce force needed to lift the object.

B. A wheel in the crane turns and the load is lifted on an axle.

C. A compound pulley system decreases the amount of force needed to lift an object.

D. The crane pulls objects up an inclined plane.

Answers

Answer 1
C I believe sorry if i’m wrong
Answer 2
Definitely C. I spent a few minutes researching so I am pretty confident.

Related Questions

The bottom wave has a greater _____

(1 point)



amplitude.

frequency.


trough.


wavelength.

Answers

Answer: hope this helps ♡

The bottom wave has a greater frequency.

Explanation:

1. Waves with a low frequency have a longer wavelength.

2. Waves with a high/great frequency have a shorter wavelength.

The bottom wave has a greater frequency. So, the second option is correct.

What is meant by frequency of a wave ?

Frequency of a wave is defined as the number of oscillations the wave completes in one second.

Here,

The diagrams of two waves are represented. The propagation of wave from the time zero to one second is given.

From the first diagram,

The wave is travelling from point a at t =  0 and reached at the point b at t = 1 s. This means in a time duration of 1 second, it has travelled a distance ab from a to b. The time taken for one oscillation to complete is called the time period. In the diagram, the number of waves passing in one seconds can be calculated. A few number of waves passed in one second.

From the second diagram,

The wave is travelling from the point a to point b in a time duration of one second. When compared to the top wave, the time taken for one wave to complete is lesser for the bottom wave. That means the time period is lesser than the top wave. In the diagram, it can be seen that, the number waves that has been completed in the one second is very high compared to that of the top wave. That means the bottom wave has higher frequency than that of the top wave.

Hence,

The bottom wave has a greater frequency.

To learn more about frequency of waves, click:

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Which type of wave can carry energy through a vacuum?(1 point)


electromagnetic


seismic


mechanical


sound

Answers

electromagnetic wave can carry energy through a vacuum
Electromagnetic waves.

Electromagnetic waves does not require any medium to propagate. These wave transmits energy through vaccum.

Why does an ice cube melt when you hold it in your hand?

A. Thermal energy from your hand flows into the ice cube.

B. Your hand pulls kinetic energy away from the ice cube.

C. The air around the ice cube insulates it from the thermal energy in your hand.

D. Potential energy from your hand is converted into thermal energy.

Answers

Answer:

Thermal heat

Explanation:

The heat is transferred from your hand to the ice cube resulting in it melting.

A. Thermal energy from your hand flows into the ice cube.
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