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3 years ago

Does a satellite have its greatest speed when it is closest to or farthest from earth?

Physics

2 answers:

Jet001 [13]3 years ago

3 0

When it is closest to the earth.

Pie3 years ago

3 0

Gravitational force is inversely proportion to the square of distance between 2 objects. So a satellite will have greatest speed when it's closer to earth.

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Which of the following is something you could do to reduce your impact on the environment?

kiruha [24]

Answer:

Take shorter showers.

Throw newspapers in the trash can.

5 0

3 years ago

find out how was life like in ancient China by exploring the engineering and metal technology of Ancient China. Gather some poin

scZoUnD [109]

The grand canal was built to make easier the transportation of grains to the power center of north china.

<h3>How was the Grand Canal built?</h3>

The canal was built in order to connect the Yellow River in the north with the Yangtze River in the south. This canal is built for making easier the transportion of grain from the south to the centers of north China. The total length of the Grand Canal is 1,776 km.

So we can conclude that the grand canal was built to make easier the transportation of grains to the power center of north china.

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5 0

2 years ago

The coefficient of friction between a rider and the merry go round is 0.45 and the person is measured to be traveling at 20.0 RP

svlad2 [7]

The person must stand at a radius of 0.99 m

Explanation:

In order for the person to stand on the merry go round, the force of friction acting on the person must provide the centripetal force necessary to keep the person in uniform circular motion.

Therefore, we can write:

$\mu mg = m\omega^2 r$

where:

- the term on the left is the force of friction, and the term on the right is the centripetal force

$\mu = 0.45$ is the coefficient of friction

m is the mass of the person

$g=9.8 m/s^2$ is the acceleration of gravity

$\omega = 20 \frac{rev}{min} \cdot \frac{2\pi rad/rev}{60 s/min}=2.09 rad/s$ is the angular velocity

r is the radius of the circular path

Solving the equation for r, we find the radius at which the person must be standing:

$r=\frac{\omega^2}{\mu g}=\frac{(2.09)^2}{(0.45)(9.8)}=0.99 m$

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8 0

3 years ago

Help and explain please

babunello [35]

Answer: a) Moment = 200N.m

b) F = 500N

Explanation: <u>Moment</u> or <u>Torque</u> is the tendency of a body to rotate because of an aplplied force. It can be calculated as

$\tau = F.r.sin\theta$

F is force applied

r is distance from the force to the point of rotation

θ is the angle formed between force and distance

a) Since F and r are perpendicular, θ=90°, sin90° = 1, so

$\tau=F.r$

$\tau=100(2)$

$\tau=$ 200

<u>Torque</u><u> caused by weight of the barrier at the pivot is </u><u>200N.m</u>

<u />

b) Counterweight has the same torque as pivot: $\tau=$ 200

So, to find Force necessary to balance the weight:

$\tau=F.r$

$F=\frac{\tau}{r}$

$F=\frac{200}{0.4}$

F = 500

<u>It is necessary </u><u>a force of 500N</u><u> from the counterweight to balance the weight.</u>

<u />

4 0

3 years ago

The water in this pot is in the process of changing from a liquid to a gas. Thermal energy is still being added to the water as

olga nikolaevna [1]

The extra energy allows the molecules to convert states of molecules.

<h3>What is heating?</h3>

When the temperature is increased , the body or particle is said to be heating.

The water in this pot is in the process of changing from a liquid to a gas. Thermal energy is still being added to the water as it vaporizes, but its temperature and the motion of its particles are not increasing.

When the liquid is converted to gas, the temperature reaches the boiling point of water. After boiling, the heat added up will only make the particles to convert its phase and go away in then atmosphere.

Thus, extra energy added helps molecules of water to change its state from liquid to solid.

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6 0

2 years ago