A huge cannon is assembled on an airless planet having insignificant axial spin. The planet has a radius of 5.00 × 106 m and a mass of 3.95 × 1023 kg. The cannon fires a projectile straight up at 2000 m/s
An observation satellite orbits the planet at a height of 1000 km. What is the projectile's speed as it passes the satellite? (G = 6.67 × 10-11 N • m2/kg2) A) 1500 m/s
B) 1380 m/s
C) 1610 m/s
D) 1280 m/s
A
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The image seen in a plane mirror is due to
A) specular reflection. B) diffuse reflection. C) both of these D) neither of these
Which type of telescope did Galileo turn skyward in 1610?
A. single lens refractor B. achromatic refractor C. prime focus reflector D. Newtonian reflector E. Cassegrain reflector
Power: A resistance heater is rated at 1200 W when operating at 110 V dc. What current will it draw?
A. 0.090 A B. 1.0 A C. 11 A D. 12 A
A lunar month is about 28 days. If the Moon were closer to Earth than it is now, the lunar month would be
A) more than 28 days. B) unchanged at 28 days. C) less than 28 days.