A ball thrown upwards reaches a maximum height and then comes back down to the original level. As the ball is going upwards
a. the velocity and acceleration both point up.
b. the velocity points up and the acceleration down.
c. the velocity points down and the acceleration up.
d. the velocity and acceleration both point down.
e. the acceleration is zero.
b
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Approximately how long does it take stars in our region of the Milky Way to complete an orbit around the center of the Milky Way Galaxy?
A) 20,000 years B) 200,000 years C) 2 million years D) 200 million years E) 2 billion years
An individual's eye pupil changes from a diameter of 3.5 mm to 1.4 mm as the illumination is increased. By what factor does the minimum angle of resolution change?
a. 0.5 b. 0.71 c. 2.2 d. 2.5 e. 4.9
If the momentum of an electron is 1.95 × 10-27 kg ? m/s, what is its de Broglie wavelength? (h = 6.626 × 10-34 J ? s)
A) 340 nm B) 210 nm C) 170 nm D) 420 nm E) 520 nm
Global warming
a. has not yet been observed b. has been caused by increasing levels of carbon dioxide in the atmosphere c. has led to a depletion of the ozone layer in the atmosphere d. has no serious consequences