Four resistors having resistances of 20 ?, 40 ?, 60 ?, and 80 ? are connected in series across an ideal 50-V dc source. What is the current through each resistor?
A) 0.25 A
B) 0.50 A
C) 0.75 A
D) 2.0 A
E) 4.0 A
A
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Spheres of Charge: A metal sphere of radius 2.0 cm carries an excess charge of 3.0 ?C. What is the electric field 6.0 cm from the center of the sphere? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 4.2 × 106 N/C B. 5.7 × 106 N/C C. 6.4 × 106 N/C D. 7.5 × 106 N/C E. 9.3 × 106 N/C
A foul ball is hit straight up into the air with a speed of 30.0 m/s
(a) Calculate the time required for the ball to rise to its maximum height. (b) Calculate the maximum height reached by the ball. (c) Determine the time at which the ball pass a point 25.0 m above the point of contact between the bat and ball. (d) Explain why there are two answers to part (c). What will be an ideal response?
A high-frequency sound source produces a high
A) speed. B) amplitude. C) pitch. D) all of the above E) none of the above
What is the magnitude of the momentum of a proton moving at 0.95 c? 
A. 
B. 
C. 
D. 
E. 