Which of the following worlds show evidence of dried up rivers and lake beds?
A) the Moon
B) Mercury
C) Venus
D) Mars
E) all of the above
D) Mars
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Refer to the sketch above of an H-R diagram for a star cluster. Consider the star to which the arrow points. Which of the following statements about this star is true?
A) It is somewhat more massive than the Sun. B) It is smaller in radius than the Sun. C) It has a lower luminosity than the Sun. D) Its surface temperature is higher than the Sun's. E) Its core temperature is lower than the Sun's.
A 2.0-kg block slides down a fixed, rough curved track. The block has a speed of 5.0 m/s after its height above a horizontal surface has decreased by 1.8 m. Assume the block starts from rest. What is the change in mechanical energy of the block caused by the force of friction during this descent?
A. ?14 J B. ?12 J C. ?10 J D. ?16 J E. ?25 J
An object weighing 4.00 N falls from rest subject to a frictional drag force given by Fdrag = bv2, where v is the speed of the object and What terminal speed will this object approach?
A) 1.78 m/s B) 3.42 m/s C) 1.15 m/s D) 2.25 m/s E) 0.75 m/s
All the terrestrial planets lie inside the asteroid belt
Indicate whether the statement is true or false