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3 years ago

7

An alien spaceship is 300 m above the ground and moving at a constant velocity of 250 m/s upwards. How high above the ground is

the ship after 3 seconds?

1 answer:

jasenka [17]3 years ago

6 0

Answer: 1050 m

Explanation: 300 + 250x3 = 1050.

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A heavy solid disk rotating freely and slowed only by friction applied at its outer edge takes 120 seconds to come to a stop.

alisha [4.7K]

Answer:

The time is 16 min.

Explanation:

Given that,

Time = 120 sec

We need to calculate the moment of inertia

Using formula of moment of inertia

$I=\dfrac{1}{2}MR^2$

If the disk had twice the radius and twice the mass

The new moment of inertia

$I'=\dfrac{1}{2}\times2M\times(2R)^2$

$I'=8I$

We know,

The torque is

$\tau=F\times R$

We need to calculate the initial rotation acceleration

Using formula of acceleration

$\alpha=\dfrac{\tau}{I}$

Put the value in to the formula

$\alpha=\dfrac{F\times R}{\dfrac{1}{2}MR^2}$

$\alpha=\dfrac{2F}{MR}$

We need to calculate the new rotation acceleration

Using formula of acceleration

$\alpha'=\dfrac{\tau}{I'}$

Put the value in to the formula

$\alpha=\dfrac{F\times R}{8\times\dfrac{1}{2}MR^2}$

$\alpha=\dfrac{2F}{8MR}$

$\alpha=\dfrac{\alpha}{8}$

Rotation speed is same.

We need to calculate the time

Using formula angular velocity

$\Omega=\omega'$

$\alpha\time t=\alpha'\times t'$

Put the value into the formula

$\alpha\times120=\dfrac{\alpha}{8}\times t'$

$t'=960\ sec$

$t'=16\ min$

Hence, The time is 16 min.

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3 years ago

Which statements describe processes involved in the accretion of planetesimals and protoplanets? Check all that apply.

MakcuM [25]

Answer:

The correct options are;

Both involve the formation of solid particles from nebular materials

Both involve the work of gravitational push on nebular materials

Explanation:

Planetesimals are thought to be the product of grains of cosmic dusts that are found in the debris and protoplanetary discs, such that hundreds of planet forming embrayos are considered to be the result of the collisions of planetesimals that collide with each other to form larger embrayos

Protoplanets is a large planetary body with a stratified interior due to internal melting that has taken place. They originate in the protoplanetary discs from the collision of planetesimals that are up to a kilometer in size.

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3 years ago

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What would happen to a 100N gravitational force if both masses were doubled and the radius were

grin007 [14]

Answer:

They are the only joints that can do 360 degrees and rotate with their own axis. But, because of its free-moving, it is prone to any dislocation compared to other movable joints.

Explanation:

7 0

3 years ago

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How are u guys define unification of germany

rjkz [21]

The Unification of Germany into the German Empire, a Prussia-dominated nation state with federal features,[1] officially occurred on 18 January 1871 at the Versailles Palace's Hall of Mirrors in France. Princes of the German states gathered there to proclaim Wilhelm of Prussia as Emperor of the German Empire after the French capitulation in the Franco-Prussian War.

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3 years ago

Average human body temperature is 98.6F. What is the equivalent in degrees Celsius?

nikdorinn [45]

Answer:

37 degrees Celsius

Explanation:

From the question

F =98.6F

C = 5/9 x (F-32)

C = 5/9 x (98.6 - 32)

= 5/9 x 66.6

= 333/9

= 37 degrees Celsius

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3 years ago