An x-t graph is drawn for a ball moving in one direction. The graph starts at the origin and at t = 6 s the velocity of the ball is zero. We can be positive that at t = 6 s,
a. the slope of the curve is non-zero.
b. the acceleration is constant.
c. the ball has stopped. d. none of the above answers is always correct.
C
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A constant magnetic field is applied perpendicular to the plane of a square, single-turn coil with each side equal to 15 cm. If the area of the coil decreases at a rate of 0.20 m2/s, an emf of 20 mV is induced in that coil
What is the strength of the magnetic field applied to the coil? A) 0.10 T B) 0.20 T C) 0.30 T D) 0.40 T E) 0.50 T
If you are in the Earth's umbra on the Earth's surface, then
A) the Moon is always visible. B) it must be a lunar eclipse of some type. C) it must be a total solar eclipse. D) it is night time. E) the Sun is always visible.
To measure the current through and the voltage across a resistor in a circuit, you should place the ammeter in _____ with the resistor and the voltmeter in _____ with the resistor
a. series, series c. parallel, parallel b. parallel, series d. series, parallel
A circuit contains two inductors of 6.0 mH inductance in series placed in parallel with an inductor of 8.0 mH inductance. After one of the 6.0 mH inductors burns out, the repair person wants to replace all three inductors with one inductor of equivalent inductance. Assuming inductors combine in series and parallel the same way resistors do, what inductance should she use?
a. 3.0 mH b. 3.4 mH c. 4.8 mH d. 11 mH e. 20 mH