A spherical oil droplet with nine excess electrons is held stationary in an electric field between two large horizontal plates that are 2.25 cm apart
The field is produced by maintaining a potential difference of 0.3375 kV across the plates, and the density of the oil is 824 kg/m3. What is the radius of the oil drop? (e = 1.60 × 10-19 C)
8.61 µm
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Jennifer hits a stationary 200. gram ball and it leaves the racket at 40. m/s. If time lapse photography shows that the ball was in contact with the racket for 40. ms:
(a) What average force was exerted on the racket? (b) What is the ratio of this force to the weight of the ball?
If a photon produces an electron-positron pair and one other particle, the other particle may be a(n)
a. muon. b. antineutrino. c. neutrino. d. photon.
The semimajor axis of an ellipse is
a. the ratio of the longest diameter of the ellipse to that of the shortest diameter of the ellipse. b. half the length of the shortest diameter of the ellipse. c. half the length of the longest diameter of the ellipse. d. the distance between the two foci of the ellipse. e. the ratio of the distance between the two foci to the length of half the longest diameter of the ellipse.
The terra of Venus are rare, but large continent size uplifted regions over a low surface
Indicate whether the statement is true or false