The reason the rings of Saturn exist is because:
A) the ring material lies within the Roche limit of Saturn.
B) the gravitational influence of Titan confines them to those orbits.
C) the eruptions of Mimas' volcanoes are keeping them supplied with ice.
D) there has not been sufficient time for the ring particles to form a moon.
E) Saturn's rapid rotation is spinning material away from its equator, out into space.
A
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The water hole has very high background interference
Indicate whether the statement is true or false
Energy Conservation With Nonconservative Forces: A 0.12-kg block is held in place against the spring by a 35-N horizontal external force. The external force is removed, and the block is projected with a velocity v1 = 1.2 m/s when it separates from the spring, as shown in the figure. The block descends a ramp and has a velocity v1 = 1.4 m/s at the bottom of the ramp. The track is frictionless between points A and B. The block enters a rough section at B, extending to E. The coefficient of kinetic friction between the block and the rough surface is 0.26. The block moves on to D, where it stops. By how many centimeters was the spring initially compressed?
width="576" /> A. 0.49 cm B. 0.26 cm C. 0.18 cm D. 0.99 cm E. 0.67 cm
The ultimate source of energy that powers the Sun is
A) chemical potential energy of hydrogen burning into helium. B) mass energy of hydrogen fusing into helium. C) gravitational potential energy of the contraction of the gas cloud that formed the Sun. D) kinetic energy of the orbital motion of the Sun. E) thermal energy of the hydrogen atoms in the Sun.
Which of the following countries produces the most carbon from fossil fuels, per person?
A) China B) Japan C) Western Europe D) United States E) former Soviet Union