Which of the following best describes the current status of the debate over evidence for life in the Martian meteorite ALH84001?
A) Most scientists now agree that the meteorite shows clear evidence of past life on Mars.
B) Most scientists now agree that the meteorite shows no evidence for past life on Mars.
C) Most scientists agree that the evidence would support life if the meteorite truly comes from Mars, but few scientists accept that the meteorite is from Mars and instead think it is an ordinary Earth rock.
D) Most scientists find the evidence intriguing but suspect that it can be explained without requiring past life on Mars.
D
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If I = 2.0 A in the circuit segment shown below, what is the potential difference VB?VA?
A. +10 V B. ?20 V C. ?10 V D. +20 V E. +30 V
A point charge is located at the origin. Centered along the x axis is a cylindrical closed surface of radius 10 cm with one end surface located at x = 2 m and the other end surface located at x = 4 m. If the magnitude of the electric flux through the surface at x = 2 m is 4 N ? m2/C, what is the magnitude of the electric flux through the surface at x = 4 m?
a. 1 N ? m2/C b. 2 N ? m2/C c. 4 N ? m2/C d. 16 N ? m2/C e. The correct value is not given.
A 24.0-kg crate, initially at rest, slides down a ramp 4.0 m long and inclined at an angle of 20° with the horizontal. If there is no friction between ramp surface and crate, what is the kinetic energy of the crate at the bottom of the ramp? (g = 9.8 m/s2)
a. 880 J b. 940 J c. 644 J d. 322 J e. 161 J
The speed of light in a material is 1.74 × 10^8 m/s. What is the index of refraction of this material?
a. 1.72 b. 0.58 c. 1.74 d. 0.218