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3 years ago

Can someone please answer this science question please?

Physics

1 answer:

olga nikolaevna [1]3 years ago

4 0

Volcanoes: Most volcanoes are formed by the movement of tectonic plates on the surface of the earth. These plates basically float on mantle. Sometimes these plates will sink into the mantle. The rock becomes so hot it melts. Gradually, the molten rock (the melted rock) will then make it's way back up. When it surfaces it, we call it "lava". As lava layers, it slowly forms a volcano.

Valleys: Basically formed by a river valley. The stream shapes the Earth's crust over time into a funnel-like v-shape or u-shape (depending on the flow of the stream).

Mountains: When plates collide and through pressure start building up into a cone shape.

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A mass M tied to a light string is moving in a vertical circle. The tension in the string at the top is TT and TB at the bottom

natita [175]

Answer:

Explanation:

Tension provides centripetal force in the circular motion . In circular motion work done by force = torque x angle

torque is zero as , centripetal force passes through axis of rotation that is center.

So work done by centripetal force = 0

So work done by tension on M = 0

5 0

3 years ago

What happens to the force between two charges if one of the charges are doubled?

Julli [10]

Answer:

The new force between the charges becomes double of the initial force.

Explanation:

The force acting between charge particles is given by :

$F=k\dfrac{q_1q_2}{r^2}$

k is electrostatic constant

r is distance between charges

If one of the charges are doubled, then, q₁ = 2q₁

The new force becomes,

$F'=\dfrac{2kq_1q_2}{r^2}\\\\F'=2F$

So, the new force between the charges becomes double of the initial force.

7 0

4 years ago

You're using a wedge to split a log. you are hitting the wedge with a large hammer to drive it into the log. it takes a force of

KIM [24]

The work performed on an object is the force multiplied by the distance it is moved, provided the movement is parallel to the force. Since that is the case here, we can get the work by W=Fd=1900N x 0.23m = 437J. This energy is used to split the wood.

6 0

4 years ago

Read 2 more answers

A reasonable walking speed is _____. A. 0.02 m/s B. 0.2 m/s C. 2 m/s D. 20 m/s

statuscvo [17]

I am gonna have to say A 0.02 because 2 meters a second is way too fast 0.2 is a little more than reasonable and if 2 meters a second is too fast then 20 is off so A. should be most reasonable

7 0

4 years ago

A tray filled with ice is removed from the freezer. After a short period of time, the ice begins to melt.

Sav [38]

A: decreases in specific heat capacity

3 0

3 years ago