What do meteorites reveal about the solar system?
A) They reveal that the solar system once contained 10 planets.
B) They reveal that the early solar system consisted mostly of hydrogen and helium gas.
C) They reveal that the age of the solar system is approximately 4.6 billion years.
D) They reveal that meteorites are much older than the comets and planets.
E) Nothing, because they come from other star systems.
C
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If the inner accretion disk around a black hole has a temperature of 10^6 K, at what wavelength will it radiate the most energy? (Hint: From Wien's law, ?T =3,000,000 where ? is in nm and T is in K.)
a. 10^6 nm b. 3 nm c. 3 × 10^6 nm d. 1 nm e. 3 × 10^11 nm
A string is stretched and fixed at both ends, 200 cm apart. If the density of the string is 0.015 g/cm, and its tension is 600 N, what is the wavelength (in cm) of the first harmonic?
A. 600 B. 400 C. 800 D. 1000 E. 200
Of photons of red, yellow, light, and blue light, which photons have the greatest energy?
a. red b. yellow c. green d. blue
Jason takes off from rest across level water on his jet-powered skis. The combined mass of Jason and his skis is 75 kg (the mass of the fuel is negligible). The skis have a thrust of 200 N and a coefficient of kinetic friction on water of 0.10
Unfortunately, the skis run out of fuel after only 67 s. How far has Jason traveled when he finally coasts to a stop? A) 5400 m B) 3800 m C) 10,000 m D) 7600 m