The current through a 50. ? resistor is I = 0.80 sin (240. t) amperes
(a) At what frequency does the current vary?
(b) How much power is dissipated in the resistor?
(a) 38. Hz
(b) 16. W
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An electron moves in a region where the magnetic field is uniform, has a magnitude of 60 ?T, 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
Object A is more massive than object B. Which of the following statements is true?
A. Both object A and object B experience the same gravitational force. B. Both object A and object B experience the same gravitational acceleration. C. Object A experiences a greater gravitational force and gravitational acceleration than object B.
According to Huygens' principle, each point on a wave can be considered as the source of a new wave that propagates from that point onward
Indicate whether the statement is true or false
It is expected that planets around high-mass main-sequence stars would be good places to search for extraterrestrial life
a. True b. False Indicate whether the statement is true or false