In radio galaxies, the main source of radio emissions is a small region at the center of the galaxy.
Answer the following statement true (T) or false (F)
False
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Daisy (50. kg mass) skates on ice at 4.0 m/s to greet her friend (70. kg mass), who is standing still, with open arms. As they collide, while holding each other, with what speed do they both move off together?
A) 2.5 m/s B) 1.7 m/s C) zero D) 5.0 m/s
The Cassini space probes used electricity provided by __________
Fill in the blank(s) with correct word
An object is released from rest when it is a height h above the surface of a planet of mass M and radius R. What is the speed of the object just before striking the surface of the planet? Neglect any air resistance. Let h = 4.0 × 10^6 m, R = 5.0 × 10^6 m, and M = 4.0 × 10^24 kg
a. 7.8 km/s b. 3.5 km/s c. 5.4 km/s d. 6.9 km/s e. 4.8 km/s
Even a little first-grader can stay up on a bicycle if he can get his bicycle moving fast enough because
A. the first-grader's weight causes a torque too small to make the bicycle fall sideways when moving. B. the angular momentum of the wheels wants to stay horizontal, due to conservation of angular momentum. C. pedaling faster is easier once you are stable, and more pedaling increases net angular momentum. D. All of these choices are correct