An extraterrestrial observer would pick up the strongest radio signals when
A) the Earth was at perihelion.
B) at new or full moon.
C) North America was directly in front of the observers.
D) North America was either rising or setting for the observer.
E) the Super Bowl is on.
D
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The deepest point of the Pacific Ocean is 11,033 m, in the Mariana Trench. What is the water pressure at that point? The density of seawater is 1025 kg/m3
A) 1.13 × 107 Pa B) 2.18 × 105 Pa C) 1.11 × 104 Pa D) 1.11 × 108 Pa E) 1.09 × 105 Pa
Coulomb's Law: Two point charges each experience a 1-N electrostatic force when they are 2 cm apart. If they are moved to a new separation of 8 cm, what is the magnitude of the electric force on each of them?
A. 2 N B. 1/2 N C. 1/4 N D. 1/8 N E. 1/16 N
Mike performed 5 J of work in 10 secs. Joe did 3 J of work in 5 secs. Who produced the greater power?
a) Mike produced more power b) Joe produced more power c) both produced the same amount of power
An alternating current circuit has resistance R, inductance L and capacitance C in series with a voltage source. Which statement is correct?
a. The voltage across the capacitor leads the voltage across the inductor by 90°. b. The voltage across the inductor leads the voltage across the capacitor by 90°. c. The voltage across the inductor leads the voltage across the resistor by 180°. d. The voltage across the inductor is out of phase with the voltage across the capacitor by 180°. e. Both voltages lead the voltage across the resistor by 90°.