A bullet is fired through a board, 14.0 cm thick, with its line of motion perpendicular to the face of the board. If it enters with a speed of 450 m/s and emerges with a speed of 220 m/s, what is the bullet's acceleration as it passes through the board?
a. ?500 km/s2
b. ?550 km/s2
c. ?360 km/s2
d. ?520 km/s2
e. ?275 km/s2
b
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A mass on a spring undergoes SHM. When the mass passes through the equilibrium position, which of the following statements about it are true? (There could be more than one correct choice.)
A) Its acceleration is zero. B) Its speed is zero. C) Its elastic potential energy is zero. D) Its kinetic energy is a maximum. E) Its total mechanical energy is zero.
A small bulb is rated at 7.5 W when operated at 125 V. Its resistance (in ohms) is
a. 0.45. b. 7.5. c. 17. d. 940. e. 2 100.
Why doesn’t Earth have large volcanoes like those on Mars?
a. Earth's gravitational field is very strong and it pulls the planet into a spherical shape. b. Earth is not as geologically active as Mars. c. Earth’s crust is not thick enough to support such large mountains, moreover, its plates move. d. Large mountains on Earth are quickly eroded by the active dense atmosphere.
Aerobic organisms first started building up oxygen in the Earth's atmosphere around
A) 4.6 billion years ago B) 3.5 billion years ago C) 4.0 billion years ago D) 2.5 billion years ago