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Ainat [17]
2 years ago
13

You get hit in the head with a baseball as it is falling. What are the action and reaction forces?

Physics
1 answer:
german2 years ago
5 0

Answer:

Action: Gravity pulls on the ball.

Reaction: The ball falls to the ground.

Explanation:

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A doppler effect occurs when a source of sound moves. True or False
Shtirlitz [24]
<h2>Answer: True </h2>

The <u>Doppler effect</u> refers to the change in a wave perceived frequency when the emitter of the waves, and the receiver (or observer in the case of light) move relative to each other.

In other words, it is the variation of the frequency of a wave due to the relative movement of the source of the wave with respect to its receiver.

It should be noted that this effect  bears its name in honor of the Austrian physicist <u>Christian Andreas Doppler</u>, who in 1842 proposed the existence of this effect for the case of light in the stars. Another important aspect is that the effect occurs in all waves (including light and sound). However, it is more noticeable to humans with sound waves.

4 0
2 years ago
Two masses of size m and 4m are connected by a massless thread and are strung over a frictionless pulley of radius R and moment-
tekilochka [14]

Answer:

Total kinetic energy of entire system is 3 mgl

Explanation:

Given two masses: m and 4m.

Since the pulley is frictionless and the thread is massless, the energy here is linked to the two masses.

Total kinetic energy of entire system = decrease in gravitational potential energy of the system.

Therefore, we have :

ΔKE = Δp

ΔKE = 4mgl - mgl

= 3 mgl

Total kinetic energy of entire system is 3 mgl

6 0
3 years ago
you are sitting behind the bus driver on a moving bus in relation to a person standing on the sidewalk you are what
grigory [225]

You are sitting behind the bus driver on a moving bus in relation to a person standing on the sidewalk you are what

--------------------------

relative to sidewalk you are moving with the driver

4 0
3 years ago
ou are sparring in a tae kwon do class. Your opponent executes a roundhouse kick. The average angular velocity of his kicking le
nordsb [41]

Answer:

0.25 s

Explanation:

The angular velocity, <em>ω</em>, is related to the angular displacement, <em>θ</em>, by

\omega = \dfrac{\theta}{t}

<em>t</em> is the time.

Making <em>t</em> subject of the formula,

t = \dfrac{\theta}{\omega}

Substituting values in the question,

t = \dfrac{5}{20} = 0.25\text{ s}

6 0
3 years ago
Transfer of charge by touching is called... induction or conduction?
Fantom [35]

Answer:

Transfer of charge by touching is called conduction.

6 0
3 years ago
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