Planet Zero has a mass of 4.0 × 10^23 kg and a radius of 2.0 × 10^6 m. A 10-kg space probe is launched vertically from the surface of Zero with an initial kinetic energy of 8.0 × 10^7 J. What maximum distance from the center of Zero is achieved by the probe?
a. 3.2 × 10^6 m
b. 4.0 × 10^6 m
c. 6.0 × 10^6 m
d. 5.0 × 10^6 m
e. 2.5 × 10^6 m
d
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Radioactive Decay: If the half-life of a material is 45 years, how much of it will be left after 100 years?
A. more than 1/2 B. less than 1/2 but more than 1/4 C. more than 1/4 but less than 1/2 D. less than 1/4 but more than 1/8 E. less than 1/8
Briefly explain the paradox of the question "Where are the aliens?"
What will be an ideal response?
The primary reason the Moon lacks an atmosphere is because
A. the Moon lacks sufficient gravity to retain an atmosphere. B. the Moon is made up of the wrong kinds of rocks to release atmospheric gases. C. there is no life on the Moon. D. Earth's gravity pulls away any atmosphere the Moon collects.
A stationary but movable 450-kg cannon is fired, and the 12-kg cannonball moves off to the right with a velocity of 20.0 m/s. What is the cannon's velocity (neglecting friction or any restraints)?