An object moves 10.0 m east in 10.0 s and then returns to its starting point taking an additional 40.0 s. If west is chosen as the positive direction, what is the average speed of the object?
a. 0.4 m/s
b. –0.4 m/s
c. 10.0 m/s
d. 0 m/s
e. –10.0
a
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When 1.0-µC point charge is 15 m from a second point charge, the force each one experiences a force of 1.0 µN. What is the magnitude of the second charge? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 25 C B) 25 nC C) 0.025 C D) 1.0 C E) 10 nC
A system of a proton and an electron has a net charge of
a. +1.6 × 10^-19 C. b. –1.6 × 10^-19 C. c. 3.2 × 10^-19 C. d. zero.
Solenoid #1 has 100 turns and is 10.0 cm long. Solenoid #2 has 200 turns and is 20.0 cm long. If a current of 0.50 A is carried by #1, what current must #2 carry so that it would produce a magnetic field at its center equal to that in #1?
1.0.25 A 2.0.50 A 3.1.00 A 4.4.00 A
Twenty milliseconds is
a. 0.00002 s b. 0.0002 s c. 0.002 s d. 0.02 s e. 20000 s