A high fountain of water is in the center of a circular pool of water. You walk the circumference of the pool and measure it to be 190 meters. You then stand at the edge of the pool and use a protractor to gauge the angle of elevation of the top of the fountain. It is 55°. How high is the fountain?
a. 25 m
b. 53 m
c. 86 m
d. 43 m
e. 48 m
d
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How many protons does Tc have?
a. 93 b. 58 c. 48 d. 107 e. 43
A 0.140-kg baseball is dropped and reaches a speed of 1.20 m/s just before it hits the ground. It rebounds with a speed of 1.00 m/s. What is the change of the ball's momentum?
A) 0.0280 kg?m/s upwards B) 0.0280 kg?m/s downwards C) 0.308 kg?m/s upwards D) 0.308 kg?m/s downwards E) 0 kg?m/s
Betelgeuse is the brightest star of which constellation?
a. Orion b. Ursa Minor c. Ursa Major d. Southern Cross e. Cassiopeia
The proton-proton chain is
A) the specific set of nuclear reactions through which the Sun fuses hydrogen into helium. B) the linkage of numerous protons into long chains. C) another name for the force that holds protons together in atomic nuclei. D) an alternative way of generating energy that is different from the fusion of hydrogen into helium.