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Ira Lisetskai [31]

3 years ago

12

A friend says that astronauts in orbit are weightless because they are beyond the pull of earths gravity. Correct your friends i

gnorance.

1 answer:

OLga [1]3 years ago

4 0

They might feel weightless and that it depends on which planet they are, they might seem lighter in other planets and heavier on other planets.

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A stationary boat in the ocean is experiencing waves from a storm. the waves move at 56 km/h and have a wavelength of 160 m, bot

Lera25 [3.4K]

The wavelength $\lambda$ of the wave is 160 m, and this is the distance between two consecutive crests. The boat is located at a crest of the wave, this means that the first trough is located 80 meters from the boat (because the distance between a crest and a trough is half the wavelength).

The speed of the wave is
$v=56 km/h = 15.6 m/s$
so the time the boat takes to reach the first trough is
$t= \frac{S}{v} = \frac{80 m}{15.6 m/s}=5.1 s$

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3 years ago

Write down short notes on:<br>c. Power

Fudgin [204]

Answer: In the International System of Units, the unit of power is the watt, equal to one joule per second. In older works, power is sometimes called activity. Power is a scalar quantity.

Explanation: SI unit: watt (W)

In SI base units: kg⋅m2⋅s−3

Derivations from other quantities: P = E/t; P = F...

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3 years ago

Playing tetherball, a boy hits the 0.45 kg ball, moving toward him initially at 4.6 m/s, in the opposite direction at 2.5 m/s. H

saul85 [17]

Answer:

HI

Explanation:

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2 years ago

Select all that apply. An acorn falls from a tree. Which of the following statements is true? The force of gravity is acting on

DedPeter [7]

The net force on the acorn is less than the force of gravity.

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3 years ago

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Currently, is our planet an open or closed system?

Dmitrij [34]

Our planet is closed system because there is a limit of how much matter could be exchanged.

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3 years ago