In the figure, if Q = 30 ?C, q = 5.0 ?C, and d = 30 cm, what is the magnitude of the electrostatic force on q?
a.
15 N
b.
23 N
c.
zero
d.
7.5 N
e.
38 N
d
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The velocity of a particle moving along the x axis is given for t> 0 by vx = (32.0t? 2.00t3) m/s, where t is in s. What is the acceleration of the particle when (after t = 0) it achieves its maximum displacement in the positive x direction?
A. ?64.0 m/s2 B. zero C. 128 m/s2 D. 32.0 m/s2 E. ?32.0 m/s2
A 2.0-kg mass swings at the end of a light string (length = 3.0 m). Its speed at the lowest point on its circular path is 6.0 m/s. What is its kinetic energy at an instant when the string makes an angle of 50° with the vertical?
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