Author Question: A 12-V battery is connected in series with a switch, 6.0-W resistor, and coil. What energy is stored ... (Read 77 times)

hbsimmons88 · **on:** Jul 28, 2018

A 12-V battery is connected in series with a switch, 6.0-W resistor, and coil. What energy is stored in the coil when the current is 2.0 A? The time constant is 2.0 10-3 s.
a. 9.6 10-3 J
c. 2.9 10-2 J
b. 4.8 10-3 J
d. 2.4 10-2 J

Question 2

A wave travels in a string at 60 m/s. A second string of 40 greater linear density has the same tension applied as in the first string. What will be the resulting wave speed in the second string?
a. also 60 m/s
c. 72 m/s
b. 51 m/s
d. 55 m/s