A child throws a ball with an initial speed of 8.0 m/s at an angle of 40° above the horizontal. The ball leaves her hand 1.0 m above the ground
Neglect air (a) How far from where the child is standing does the ball hit the ground? (b) How long is the ball in flight before it hits the ground? (c) What is the magnitude of the ball's velocity just before it hits the ground?
(a) 7.5 m (b) 1.2 s (c) 9.1 m/s
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A) 0 Hz. B) 1 Hz. C) 2 Hz. D) 3 Hz. E) 4 Hz.
The end of a compass needle that points to the south pole of a magnet is the
A) north pole. B) south pole. C) both of these
Helium was first discovered in the
A) laboratory. B) upper atmosphere. C) Sun. D) island of Helios, in Greece. E) byproducts of nuclear fusion.
Which of these moons are most interesting to exobiologists?
A) Europa and Miranda B) Europa and Enceladus C) Titan and Triton D) Triton and Charon E) Io and Titan