Physics - Study Mode

[#441] A person can jump higher on the moon's surface than on the earth because :
Correct Answer

(B) The acceleration due to gravity in moon is smaller than that on the earth.

Explanation

Solution: Earth's gravity is 6 times moon's gravity. That means moon attracts an object with less force than earth. Hence a person can jump higher on moon than on earth.

[#442] The velocity required to place a vehicle in orbit around the moon is ________ that required to place it in orbit round the earth.
Correct Answer

(A) Less than

Explanation

Solution: The velocity required to place a vehicle in orbit around the moon is less than required to place it in orbit round the earth.

[#443] Which measurement depends on gravitational force?
Correct Answer

(B) Weight

Explanation

Solution: Weight is a measure of force that is equal to the gravitational pull on an object. Mass is independent of location, while weight depends on location.

[#444] What is the minimum escape velocity of rocket to be launched into space ?
Correct Answer

(C) 11 Km/Sec.

Explanation

Solution: A spacecraft leaving the surface of Earth, for example, needs to be going about 11 kilometers (7 miles) per second, or over 40,000 kilometers per hour (25,000 miles per hour), to enter orbit. Achieving escape velocity is one of the biggest challenges facing space travel.

[#445] The period of revolution of a geostationary satellite is
Correct Answer

(C) 24 hours

Explanation

Solution: The period of revolution of a geostationary satellite is 24 hours.