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

Physics & Space Science

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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

Physics & Space Science

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.

Physics & Space Science

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?

Physics & Space Science

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

Physics & Space Science