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qUESTIONS

A calorie is a unit of heat and it equals 4.2 J, where 1 J = kg m2s-2. A distant civilisation employs a system of units in which the units of mass, length and time are α kg, β m and γ s. Also J’ is their unit of energy. What will be the magnitude of calorie in their units?

2 The moon is at a distance of 3.84×10^8 m from the Earth. If viewed from two diametrically opposite points on the Earth, the angle subtended at the moon is 1° 54′. What is the diameter of the Earth?

A star is 5.5 light years away from the Earth. How much parallax in parcsec will it subtend when viewed from two opposite points along the orbit of the Earth?

What is the solid angle subtended by the moon at any point of the Earth, given the diameter of the moon is 3474 km and its distance from the Earth 3.84×108 m.

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