If the radius of the Earth somehow decreased with no change in mass, your weight would
A) decrease.
B) increase.
C) not change.
Answer: B
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A parallel-plate capacitor, made of two circular plates of radius R = 10 cm, is connected in series with a resistor of resistance R = 100 ? and a battery of emf E = 10 V
What is the maximum value of the magnetic field induced by the displacement current between the plates, at a distance r = 5 cm from the axis of the plates while the capacitor is being charged? A) 3 × 10-7 T B) 5 × 10-7 T C) 2 × 10-7 T D) 1 × 10-7 T E) 4 × 10-7 T
A 50-kg air conditioner is placed on top of a concrete pad that is 20 cm thick and has a cross-sectional area of 3.0 m2. What is the change in thickness of the pad caused by the air conditioner? Young's modulus for concrete is 2.3 × 1010 N/m2
A) 1.4 × 10-9 m B) 2.8 × 10-9 m C) 1.4 × 10-8 m D) 1.4 × 10-7 m E) 2.8 × 10-8 m
Which of the following statements about the celestial equator is true at all latitudes?
A) It extends from your horizon due north, through your zenith, to your horizon due south.
B) It cuts the dome of your local sky exactly in half.
C) It represents an extension of Earth's equator onto the celestial sphere.
D) It lies along the band of light we call the Milky Way.
E) It extends from your horizon due east, through your zenith, to your horizon due west.
An 800-kHz radio signal is detected at a point 2.7 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.36 V/m
Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the intensity of the radio signal at that point? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 170 µW/m2 B) 240 µW/m2 C) 340 µW/m2 D) 120 µW/m2 E) 86 µW/m2