A 150 W light bulb is operating on a 120 V rms ac line. What is the rms current in the bulb?
A. 2.50 A
B. 1.67 A
C. 1.50 A
D. 1.25 A
E. 0.883 A
D. 1.25 A
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A straight wire is carrying a current upward. Observed from above (i.e., looking downward towards the wire), the magnetic field lines are
A. radially outward. B. radially inward. C. forming clockwise circles. D. forming counter-clockwise circles. E. directed toward the observer.
A hunter on level ground fires a bullet at an angle of 10 degrees above the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first?
A) the one dropped B) the one fired C) both hit at the same time.
The weight of a body on the Moon is _______________ the weight of the same body on Earth
Fill in the blank(s) with correct word
A baseball outfielder throws a baseball of mass 0.15 kg at a speed of 30 m/s and initial angle of 30°. What is the kinetic energy of the baseball at the highest point of the trajectory? Ignore air friction
a. zero c. 92 J b. 51 J d. 120 J