An object with a rest mass of 0.456-kg is moving at 1.20 108 ...

[chandani]

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

[tranoy]

Answer to Question 1

C

Answer to Question 2

B

[chandani]

Excellent

[scottmt]

Gracias!