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zoeyandblaze
13.07.2019 •
Physics
4. a 1,000-kilogram satellite completes a uniform circular orbit of radius 8.0 x 10 meters as
measured from the center of earth. the mass of earth is approximately 6.0 x 10-7 kilograms,
and the universal gravity constant is approximately 7.0 x 10-11 n•m/kg. determine the
work done by gravity as the satellite completes one full orbit around earth.
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Ответ:
Zero
Explanation:
The work done by a force on an object is given by:
where
F is the magnitude of the force
d is the displacement of the object
In this situation, the force is the force of gravity acting on the satellite. This force always points towards the centre of the trajectory, so it is always perpendicular to the direction of motion of the satellite (since the orbit is circular), so
and
. Therefore, the work done by gravity is also zero.
Ответ:
The surface area of a sphere can be found using the formula SA=4(x)pi(x)R squared. Middleton Middle School wants to paint kickballs purple for their carnival. The kickballs are all the same size. They used 6923.7 inches
of paint when painting 5 kickballs. What is the radius of each purple kickball? Use 3.14 for pi
x=times
Explanation: