What was the approximate temperature of the universe at an age of 1015 s?
A) about 1 K
B) about 100 K
C) about 105 K
D) about 1015 K
B) about 100 K
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What is the capacitive reactance of an 8.00 ?F V capacitor attached to 120 V rms at 60.0 Hz?
A. 166
B. 332
C. 663
D. 480
E. 960
The diagram shows a circular wire loop of radius R carrying current I. What is the magnitude of the magnetic field, B, at the center of the loop?
A parallel-plate capacitor has a capacitance of 10 mF and is charged with a 20-V power supply
The power supply is then removed and a dielectric material of dielectric constant 4.0 is used to fill the space between the plates. What is the voltage now across the capacitor? A) 2.5 V B) 10 V C) 5.0 V D) 80 V E) 20 V
A ball rolls without slipping down incline A, starting from rest. At the same time, a box starts from rest and slides down incline B, which is identical to incline A except it is frictionless. Which has a larger translational speed at the bottom of the ramp?
1.They have the same translational speed at the bottom of the ramp. 2.the ball 3.the box 4.It is impossible to determine.