What creates a total lunar eclipse?
a. The Sun passes completely through Earth's umbra.
b. The Moon passes completely through Earth's umbra
c. The Moon passes through some of Earth's penumbra.
d. The Earth passes completely through the Moon's umbra.
e. The Earth passes through some of the Moon's penumbra.
b
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Even if a probe were in a stable orbit near a black hole, we would still observe its signals redshifted by the gravitational field of the black hole
Indicate whether the statement is true or false
As a result of friction between internal parts of an isolated system
A. the total mechanical energy of the system increases. B. the total mechanical energy of the system decreases. C. the total mechanical energy of the system remains the same. D. the potential energy of the system increases but the kinetic energy remains the same. E. the kinetic energy of the system increases but the potential energy of the system remains the same.
A river has a steady speed of 0.30 m/s. A student swims downstream a distance of 1.2 km and returns to the starting point. If the student swims with respect to the water at a constant speed and the downstream portion of the swim requires 20 minutes, how much time is required for the entire swim?
a. 50 minutes b. 80 minutes c. 90 minutes d. 70 minutes e. 60 minutes
Firewalking is similar to
A. water on a saucepan B. the space shuttle reentry C. an automobile air bag D. water skiing