A force of 100 N is applied to a rod with a diameter of 6.00 mm. The stress in the rod is
a. 
b. 
c. 
d. 
e. 
c.
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Super-earths are
A) planets that are most earthlike, likely to harbor life. B) planets that are a few times the mass of the Earth. C) planets that have earthlike masses, but orbit much closer to their star than the Earth does to the Sun. D) any rocky (or terrestrial) planet. E) Earth-mass planets that are much lower in density than the Earth, giving them larger radii.
As measured from the Earth, a spacecraft is moving at speed 0.80c toward another spacecraft moving at speed 0.60c in the same direction, i.e., the first spacecraft is catching up with the second spacecraft. What is the speed of the first spacecraft as viewed from the second spacecraft?
a. 0.38c b. –0.20c c. –0.38c d. not given
Which of the following ranges corresponds to the shortest wavelengths?
a. infrasonic b. audible c. ultrasonic d. All have the same wavelengths.
An alpha particle (m = 6.7 × 10^?27 kg, q = +3.2 × 10^?19 C) has a speed of 20 km/s at point A and moves to point B where it momentarily stops. Only electric forces act on the particle during this motion. Determine the electric potential difference VA ? VB
a. +4.2 V b. ?4.2 V c. ?9.4 V d. +9.4 V e. ?8.4 V