Author Question: Exceedingly high temperatures are needed in a fusion reactor because _______. a. electrostatic ... (Read 47 times)

Diane · **on:** Jul 28, 2018

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