Hey guys help me out with this what is dopplers effect ...

1 answer:

6 0

Answer: The Doppler effect is when the frequency of a sound or light wave is increased or decreased as the observer moves away or toward the source. This is why the pitch of sirens seems to change when they get closer and when they get further.

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Consider a person sliding down a water slide at constant velocity. what are the forces acting on the person as they slide? are t

Andru [333]

Explanation :

When a person is sliding with constant velocity, the forces that are acting on him are :

(1) Weight, W = mg where g is acceleration due to gravity.

(2) Friction forces acting opposite to the direction of motion.

(3) Normal force.

The forces acting on the person is balanced because the person is sliding with constant velocity.

From figure it is clear that, friction force is balanced by $w\ sin\theta$ and normal is balanced by $w\ cos\theta$ .

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3 years ago

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A quantity that is fully described by magnitude alone is a ___________ quantity. A quantity that is fully described by both magn

deff fn [24]

Answer:

Scalar quantity

Vector quantity

Explanation:

A scalar quantity is a quantity that is fully described by magnitude alone. Examples include; mass, temperature etc

A vector quantity is described by both magnitude and direction. E.g force, weight etc

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3 years ago

Your friend clams that objects do not have to be thouching for a magnetic force to cause motion. How would you support your frie

Leni [432]

Yes because something that has been electrically charged can make other things move without touching them ( this is called force without contact)
Hoped this helped :)

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3 years ago

Based on the law of conservation of energy, how can we reasonably improve a machine’s ability to do work?

MrMuchimi

D. Redefine the machine’s system boundaries.

The Law of Conservation of Energy states that energy can't be created not destroyed. Energy, however, can be changed from one form to another. The law applies to isolated systems only. By redefining and expanding the system (including all factors affecting it) , the machine's ability to do work should improve.

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3 years ago

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An air balloon is moving upward at a constant speed of 3 m/s. Suddenly a passenger realizes that she left her camera on the grou

frosja888 [35]

Answer:t=0.3253 s

Explanation:

Given

speed of balloon is $u=3\ m/s$