Author Question: An object with a rest mass of 0.456-kg is moving at 1.20 108 m/s. What is the magnitude of its ... (Read 67 times)

chandani · **on:** Jul 29, 2018

An object with a rest mass of 0.456-kg is moving at 1.20 108 m/s. What is the magnitude of its momentum? (c = 3.00 108 m/s)

A) 5.57 107 kg m/s
B) 5.67 107 kg m/s
C) 5.97 107 kg m/s
D) 5.47 107 kg m/s
E) 5.87 107 kg m/s

Question 2

A small 0.050-kg insulating sphere carries a charge of -60 C and is hanging by a vertical silk thread from a fixed point in the ceiling.

An external uniform vertical electric field is now applied. If the applied electric field has a magnitude of 3000 N/C and is directed downward, what is the tension in the silk thread? (k = 1/40 = 9.0 109 N m2/C2 )
A) 0.19 N
B) 0.31 N
C) 0.41 N
D) 0.52 N
E) 0.71 N