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suter [353]
3 years ago
15

PLZZZ HELP

Physics
1 answer:
matrenka [14]3 years ago
4 0

B. A sandbar is formed by water. A sand dune is formed by wind.

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A person sitting still in a moving airplane is considered to be... (SP1a) a. Motionless in relation to everything in the plane.
vichka [17]

Answer:

C. Both a and b

Explanation:

Firstly, persons and objects in a moving plane as described in this question, are moving at the same speed as the plane even if there is no individual movement of these objects.

However, this question describes a person sitting still in a moving plane. This means that;

- The person is motionless in relation to everything in the plane i.e the person is not moving even if other things in the plane are.

- The person is in motion compared to everything on the ground i.e. the person is moving at the same speed as the plane, hence, in comparison with the ground, the person is moving.

Therefore, options A and B are correct

6 0
3 years ago
A constant friction force of 25 Nacts on a 65 kg skier for 20
Radda [10]

Answer:

The skier's change in velocity is 7.69 meters per second.

Explanation:

The Newton's second law tells force is equal to the change on the linear momentum of a body:

\sum\overrightarrow{F}=\frac{d\overrightarrow{p}}{dt}

If we approximate the differential \frac{d\overrightarrow{p}}{dt} to \frac{\Delta\overrightarrow{p}}{\Delta t}:

\sum\overrightarrow{F}=\frac{\Delta\overrightarrow{p}}{\Delta t}

Using that linear momentum is mass times velocity:

\sum\overrightarrow{F}=\frac{m\Delta\overrightarrow{v}}{\Delta t}

Solving for \Delta\overrightarrow{v}:

\Delta\overrightarrow{v}=\frac{\Delta t\sum\overrightarrow{F}}{m}=\frac{(20\,s)(25\,N)}{65\,kg}

\Delta\overrightarrow{v}=7.69\,\frac{m}{s}

3 0
3 years ago
Which of the following best defines spring constant ?
mojhsa [17]

Answer:

your answer gonna be The letter C is the correct answer

5 0
3 years ago
Read 2 more answers
It's not physics it's physical science but I figured this was the closest subject to it. 1. The life cycle of a star begins with
krek1111 [17]
<span>The life cycle of a star begins with a Nebula</span>
8 0
3 years ago
A student stands on a scale, and the scale reads 85 N. What is being measured by the scale
Dmitry [639]

Force. Force is measured by newtons, probably because he came up with the equations to calculate force.

Hope this helps!

5 0
4 years ago
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