During summer, the northern polar cap of Mars is made of
A) carbon dioxide ice overlaying water ice
B) a layer of carbon dioxide ice
C) a layer of water ice
D) water ice overlaying carbon dioxide ice
C
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Friction: A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30. A horizontal 140-N force is applied to the box. What is the friction force on the box?
A. 140 N B. 160 N C. 16.5 N D. 0.00 N E. 42 N
The surface rocks on Venus are similar to ____ rocks on Earth
a. oxide-rich b. anorthosite c. sedimentary d. granitic e. basaltic
A car is traveling north at 17.7 m/s After 12 s its velocity is 141m/s in the same direction. Find the magnitude and direction of the car's average acceleration
A) 0.30 m/s2, south B) 0.30 m/s2, north C) 2.7 m/s2, north D) 2.7 m/s2, south
The number of comets in the Oort cloud is probably about
A) a thousand. B) a million. C) a billion. D) a trillion. E) a quintillion.