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3 years ago

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HELP ME PLEASE

1 answer:

tino4ka555 [31]3 years ago

3 0

Answer:

The answer is C. Its not on mars and its not 10 football feilds its only 1

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The earth's interior heat and pressure drive a process of heat transfer in the mantle called _____.

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Convection. It is the transfer of heat by the circulation and movement of the molecules that come from liquid or gas.

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food does not pass through the liver or the pancreas why are these organs dtill important parts of the digestive system?

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Which planet will take the shortest revolution around the sun?

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4 years ago

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A mass is tied to a string and swung in a horizontal circle with a constant angular speed. show answer No Attempt If this speed

Liono4ka [1.6K]

Answer:

The tension in the string is quadrupled i.e. increased by a factor of 4.

Explanation:

The tension in the string is the centripetal force. This force is given by

$F = \dfrac{mv^2}{r}$

m is the mass, v is the velocity and r is the radius.

It follows that $F \propto v^2$ , provided m and r are constant.

When v is doubled, the new force, $F_1$ , is

$F_1 = \dfrac{m(2v)^2}{r} = \dfrac{4mv^2}{r} = 4\dfrac{mv^2}{r} = 4F$

Hence, the tension in the string is quadrupled.

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4 years ago

The length of the minute hand of the clock is 14cm. Calculate the speed with which the tip of the minute hand moves

Molodets [167]

Speed of the tip of the minute hand=V=0.0244 cm/s

Explanation:

The angular velocity of the minute hand is given by

$\omega= \frac{2\pi}{T}$

T= time period of the minute hand=60 min=3600 s

so ω= 2 π/3600 rad/s

Now linear velocity v= r ω

r= radius of minute hand=14 cm

so v= 14 (2 π/3600)

V=0.0244 cm/s

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3 years ago