An object hits a wall and bounces back with half of its original speed. What is the ratio of the final kinetic energy to the initial kinetic energy of the object?
A) 1/2
B) 1/4
C) 1/8
D) 1/16
B
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If a sunspot has a temperature of 4,500 K and the surrounding solar surface has a temperature of 5,800 K, how many times brighter is the surface compared to the sunspot?
a. 0.28 b. 0.36 c. 2.8 d. 3.6 e. 36
The sun's energy comes from
A) the fission of uranium. B) the fusion of helium into hydrogen. C) the fission of helium into hydrogen. D) the fusion of hydrogen into helium. E) None of the above.
A steel guitar string with a diameter of 0.300 mm and a length of 70.0 cm is stretched by 0.500 mm while being tuned. How much force is needed to stretch the string by this amount? Young's modulus for steel is 2.0 × 1011 N/m2
What will be an ideal response?
A container is filled with fluid 1, and the apparent depth of the fluid is 9.00 cm. The container is next filled with fluid 2, and the apparent depth of this fluid is 6.86 cm. If the index of refraction of the first fluid is 1.37, what is the index of refraction of the second fluid?
a. 1.80 b. 2.41 c. 1.57 d. 1.20 e. More information is needed to find the value.