Exceedingly high temperatures are needed in a fusion reactor ...

[Diane]

Exceedingly high temperatures are needed in a fusion reactor because _______.
 a. electrostatic barriers must be overcome
  b. the fuel must be ionized
  c. combustion needs heat to occur
  d. water must be boiled and pressurized.

Question 2

A 0.20-kg object attached to the end of a string swings in a vertical circle (radius = 80 cm). At the top of the circle the speed of the object is 4.5 m/s. What is the magnitude of the tension in the string at this position?
 a. 7.0 N
  b. 2.0 N
  c. 3.1 N
  d. 5.1 N
  e. 6.6 N

[aloop]

Answer to Question 1

a

Answer to Question 2

C

[Diane]

Excellent

[anyusername12131]

Gracias!