An alpha particle is a nucleus of helium. It has twice the charge and four times the mass of the proton. When they were very far away from each other,
but headed toward directly each other, a proton and an alpha particle each had an initial speed of 0.0030c, where c is the speed of light. What is their distance of closest approach? Hint: There are two conserved quantities. Make use of both of them. (c = 3.00 × 108 m/s, k = 1/4??0 = 8.99 × 109 N ? m2/C2, e = 1.60 × 10-19 C, mproton = 1.67 x 10-27 kg)
A) 3.3 × 10-13 m B) 2.6 × 10-13 m C) 2.1 × 10-13 m D) 2.9 × 10-13 m
C
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An astronaut floating alone in outer space throws a baseball. If the ball moves away at 20 m/s, the astronaut will move in the opposite direction at
A) 20 m/s. B) a lower speed. C) a higher speed. D) more information needed E) none of the above
A ‘cliff diver' in Mexico dives off a high cliff and falls for 2.3 seconds before hitting the water. (a) How fast is the diver going at impact? (b) How far below the cliff is the diver at this point?
The charge per unit length on an insulator is 6.2 ?C/m. On a 2.0-m length of this material, what is the difference in the number of electrons and the number of protons?
a. There are 7.8 × 10^13 more electrons than protons. b. There are 7.8 × 10^13 more protons than electrons. c. There are 3.9 × 10^13 more protons than electrons. d. There are 3.9 × 10^13 more electrons than protons.
What is "uniform motion?"
a. smooth motion b. motion with zero acceleration c. motion with constant velocity d. motion at a constant speed e. motion along a straight path