What can be observed from Earth when a supernova explodes?
A. neutrons and neutrinos
B. photons and neutrinos
C. electrons and protons
D. photons and neutrons
Answer: B
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Fred carried a 100 N basket to his apartment the fifteenth floor of his building by climbing the stairs
June used a pulley hung from a fifteenth floor window that amplified her force by a factor of 3 to raise a different 100 N basket up to the apartment. Fred claims he'd done more work. June disagreed and says she'd put out more power. Is either person correct? Explain.
The water behind Grand Coulee Dam is 1 000 m wide and 200 m deep. Find the hydrostatic force on the back of the dam
a. 3.92E+11 N b. 2.26E+11 N c. 1.96E+11 N d. 1.66E+11 N e. 1.18E+9 N
The longest wavelength of visible light is _____
A) 400 nanometers B) 500 nanometers C) 700 nanometers D) 900 nanometers
Compared with the other jovian planets, Neptune is:
A) much larger and featureless. B) small with features similar to Jupiter. C) small and featureless. D) much larger with features similar to Saturn. E) average, but featureless.