A certain satellite orbiting Earth has a speed of about 17, 000 miles/hour. What is its approximate speed expressed to the correct number of significant figures in kilometers/second? One kilometer is about 0.62 mile, and there are 3, 600 seconds in an hour.

PHYSICAL SCIENCES

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	2.9 km/s
B	7.6 km/s
C	38, 000, 000 km/s
D	99, 000, 000 km/s

Explanation:

Detailed explanation-1: -The orbital speed for an Earth satellite near the surface of the earth is 7kms−1.

Detailed explanation-2: -The orbital speed for an Earth satellite near the surface of the Earth is 7 km/sec.

Detailed explanation-3: -The velocity of the satellite in an orbit close to earth’s surface is nothing but it’s orbital velocity. Hence from the above equation, we can conclude that orbital velocity depends on acceleration due to gravity and radius.

Detailed explanation-4: -Formula used: The formula of the time period of the satellite is given by T=2√r3GM where r is the distance between the centre of the earth and the satellite G is the gravitational constant and M is the mass of the earth.

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