In an RLC ac circuit the current in the inductor and the current in the resistor are
A. out of phase by 90
with the current in the inductor leading.
B. out of phase by 90
with the current in the resistor leading.
C. in phase with each other.
D. out of phase by an amount proportional to frequency.
E. out of phase by an amount inversely proportional to frequency.
C. in phase with each other.
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Earth's atmosphere gets most of its heat from the
A) Sun. B) Earth's core. C) both of these D) neither of these
A uniform solid sphere of mass 1.5 kg and diameter 30.0 cm starts from rest and rolls without slipping down a 35° incline that is 7.0 m long. (a) Calculate the linear speed of the center of the sphere when it reaches the bottom of the incline
(b) Determine the angular speed of the sphere about its center at the bottom of the incline. (c) Through what angle (in radians) does this sphere turn as it rolls down the incline? (d) Does the linear speed in (a) depend on the radius or mass of the sphere? Does the angular speed in (b) depend on the radius or mass of the sphere?
Two very large parallel sheets a distance d apart have their centers directly opposite each other. The sheets carry equal but opposite uniform surface charge densities
A point charge that is placed near the middle of the sheets a distance d/2 from each of them feels an electrical force F due to the sheets. If this charge is now moved closer to one of the sheets so that it is a distance d/4 from that sheet, what force will feel? A) 4F B) 2F C) F D) F/2 E) F/4
A 6.0-kg object moving 2.0 m/s in the positive x direction has a one-dimensional elastic collision with a 4.0-kg object moving 3.0 m/s in the opposite direction. What is the total kinetic energy of the two-mass system after the collision?
a. 30 J b. 62 J c. 20 J d. 44 J e. 24 J