Free Fall: A rock is thrown directly upward from the edge of a flat roof of a building that is 56.3 meters tall. The rock misses the building on its way down, and is observed to strike the ground 4.00 seconds after being thrown. Take the acceleration due to gravity to have magnitude 9.80 m/s2 and neglect any effects of air resistance. With what speed was the rock thrown?
Fill in the blank(s) with the appropriate word(s).
5.53 m/s
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Weight and g: ?MassRadiusOrbital radiusOrbital periodMoon A4.0 × 1020 kgunknown2.0 × 108 m4.0 × 106 sMoon B1.5 × 1020 kg2.0 × 105 m3.0 × 108 munknownMithra is an unknown planet that has two airless moons, A and B, in circular orbits around it. The table summarizes the hypothetical data about these moons. If you dropped a laser at the surface of Moon B, at what rate would it accelerate toward the ground? (G = 6.67 × 10-11 N ? m2/kg2)
A. 0.10 m/s2 B. 0.15 m/s2 C. 0.20 m/s2 D. 0.25 m/s2 E. 0.30 m/s2
Which of the following terms is given to a pair of stars that we can determine are orbiting each other only by measuring their periodic Doppler shifts?
A) spectroscopic binary B) eclipsing binary C) visual binary D) double star
A wave traveles through a medium. As the wave passes, the particles of the medium vibrate in a direction perpendicular to the direction of the wave's motion. The wave is:
a) longitudinal b) a pulse c) sine wave d) transverse
A coil with a self-inductance of 6.0 H is connected to a dc battery through a switch. As soon as the switch is closed, the rate of change of current is 2.0 A/s. What is the emf induced in this coil at this instant?
A) 6.0 V B) 3.0 V C) 12 V D) 0.33 V E) 0.0 V