If you want to store 2.0 mJ of energy in a 10-?F capacitor, how much potential do you need to put across it?
A) 5.0 V
B) 10 V
C) 15 V
D) 20 V
D
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A particle (mass = 4.0 g, charge = 80 mC) moves in a region of space where the electric field is uniform and is given by Ex = ?2.5 N/C, Ey = Ez = 0. If the velocity of the particle at t = 0 is given by vx = 80 m/s, vy = vz = 0, what is the speed of the particle at t = 2.0 s?
A. 40 m/s B. 20 m/s C. 60 m/s D. 80 m/s E. 180 m/s
We look toward a cool star. How can we determine that there is an interstellar dust cloud between us and the star?
What will be an ideal response?
What do we mean by gravitational time dilation?
A) It is the idea that time runs slower in places where gravity is stronger. B) It is the idea that clocks run slow for people moving at high speed past you. C) It is the idea that everyone measures time differently, depending on his/her reference frame. D) It is the idea that clocks run faster in stronger gravitational fields.
Photons of wavelength ? scatter elastically from protons at rest. The wavelength of photons scattered at 90° is increased by:
1.?/137 2.h/2?c 3.h/(mec) 4.h/(mpc) 5.? cos(45°) 6.None of the above