An asteroid revolves around the Sun with a perihelion 0.5 AU and an aphelion of 7.5 AU. What is its period of revolution?
A. 4 years
B. 8 years
C. 16 years
D. 32 years
E. 64 years
Answer: B
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In the very first phase after the big bang, when the Universe was about a microsecond old, space was filled with____
a. high-energy photons b. protons and antiprotons c. protons, neutrons, electrons, and positrons (anti-electrons) d. electrons, and positrons (anti-electrons) e. protons, neutrons, electrons
You find a coin resting on your physics book cover and notice that when you open the cover, the coin slips exactly when the cover reaches 25 degrees above the horizontal. What is the coefficient of friction between the coin and book cover?
A. 0.20 B. 0.23 C. 0.37 D. 0.47 E. The question cannot be answered without knowing the coin's mass.
It takes ________ astronauts to operate the Hubble Space Telescope
Fill in the blank(s) with correct word
An ideal spring with a spring constant (force constant) of 22N/m is stretched from equilibrium to 2.9 m. How much work is done in the process?
A) 186 J B) 47 J C) 121 J D) 93 J