Period of the motion of a satellite

A satellite is placed in a circular orbit 600km above the surface of the earth. Find the period of the motion of this satellite.

Buoyant force: Stone dropped into sea water

A stone of density 5g/cm^3 completely immersed in sea water is allowed to sink from rest. Calculate the depth to which the stone would sink in two seconds. Neglect effect of friction. Relative density of sea water = 1.025 and g = 980cm/s^2

Sound waves: temperature dependence

(1) How will the pitch of an organ pipe be affected by change of temperature and humidity ? (2)Why do the sound waves travel through longer distances during night than during day ? (3)When a hot body cools a cool one, are their temperature changes equal in magnitude ?

Geometrical Optics (Reflection of Light)

Standing 2.0 m in front of a small vertical mirror, you see the reflection of your belt buckle, which is 0.70 m below your eyes. What is the vertical location of the mirror relative to the level of your eyes and what angle do your eyes make with the horizontal when you look at the buckle? If you now move backward until you are 6.0 m from the mirror, will you see the buckle, or will you see a point on your body that is above or below the buckle? explain (please include equations)

Power Output

Approximately 4X10^9kg of matter is converted into energy each second in the sun. Find the power output of the sun.