A satellite is in a circular orbit very close to the surface of a spherical planet. The period of the orbit is 2.54 hours. What is density of the planet?

An insect is climbing up a 30 ft. vertical wall. Starting from the bottom it climbs up 3 ft. during the day and slips down 2 ft. at night. In how many days will it reach the top of the wall?

Liquid A and liquid B exert same amount of pressure on each other, but density of A is twice density of B. height of liquid B is 10 cm, then what would be the height of liquid A?

What should you use to lift a huge block of granite up to a certain height?

A sinusoidal wave has period 0.10s and wavelength 2.0m. What will be the wave speed?

Three point-charges are positioned on the x-axis. If the charges and corresponding positions are +32 mC at x = 0, +20 mC at x = 40 cm, and -60 mC at x = 60 cm, what would be the magnitude of the electrostatic force on the +32-mC charge?

If a student drops a stone from a cliff of height 35 m and time it takes to reach ground is 2.7 s, then what will be the acceleration due to gravity?

The speed of sound in water is four times its speed in air. When a sound wave of frequency 'n' and wavelength 'λ' enters from air into water, then what will be its frequency and wavelength respectively?

How many units of electricity will be consumed if you use a 65 watt electric bulb for 7.3 hours everyday for 21 days?

Measure altitudes in aircraft's, which instrument is used?