Which of the following stars will live longest?
A) a 1-solar-mass star
B) a 2-solar-mass star
C) a 3-solar-mass star
D) a 4-solar-mass star
E) a 5-solar-mass star
A
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Contrast observation of ionized and neutral hydrogen in space
What will be an ideal response?
Heat is added to an ideal gas and the gas expands. In such a process the temperature
A. will remain the same if the work done equals the heat added. B. must always decrease. C. will remain the same if the work done is less than the heat added. D. must always increase. E. will remain the same if the work done exceeds the heat added.
A 0.13-m string, fixed at both ends and vibrating in its n = 4 harmonic, excites a pipe that is long and open at both ends, into its second overtone resonance
What is the speed of transverse waves on the string? The speed of sound in air is 345 m/s. A) 30 m/s B) 38 m/s C) 36 m/s D) 32 m/s E) 34 m/s
An electron moves in a region where the magnetic field is uniform, has a magnitude of 60 mT, and points in the positive x direction. At t = 0 the electron has a velocity that has an x component of 30 km/s, a y component of 40 km/s, and a z component of zero. What is the radius of the resulting helical path?
a. 4.7 mm b. 18 mm c. 3.8 mm d. 2.8 mm e. 5.7 mm