Waves carry energy
a. True
b. False
Indicate whether the statement is true or false
True
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Phase Angles: A 10-? resistor is in series with a 100-?F capacitor at 120 Hz. What is the phase angle?
A. -82° B. -53° C. -37° D. -4.7° E. +37°
When angular momentum is conserved
A. The magnitude of the total angular momentum remains constant B. The direction of the total angular momentum remains constant C. The magnitude and direction of the total angular momentum remains constant
On average, how fast do the plates move on Earth?
A) about 1 mile per hour B) a few kilometers per year C) a few centimeters per year D) a few millimeters per century
During World War I, Germany used a "Big Bertha" cannon to hurl shells into Paris 30 miles away. This gun also had a very long barrel. What was the reason for using a long barrel in these guns?
A) to increase the force exerted on the bullet due to the expanding gases from the gunpowder B) to reduce the force exerted on the bullet due to the expanding gases from the gunpowder C) to reduce frictional losses D) to exert a larger force on the shells E) to allow the force of the expanding gases from the gunpowder to act for a longer time