The intensity of radiation reaching the Earth from the Sun is 1350 W/m2. The Earth's radius is 6.4 × 106 m. How big a force does this radiation exert on the Earth? (Assume it is all absorbed.)

A. 5.8 × 108 N
B. 1.2 × 109 N
C. 2.3 × 109 N
D. 4.6 × 109 N
E. 1.7 × 1017 N


Answer: A

Physics & Space Science

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A mass on a spring undergoes SHM. When the mass passes through the equilibrium position, which of the following statements about it are true? (There could be more than one correct choice.)

A) Its acceleration is zero. B) Its speed is zero. C) Its elastic potential energy is zero. D) Its kinetic energy is a maximum. E) Its total mechanical energy is zero.

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