When an automobile moves with constant velocity the power developed is used to overcome the frictional forces exerted by the air and the road. If the power developed in an engine is 50.0 hp, what total frictional force acts on the car at 55 mph (24.6 m/s)? One horsepower equals 746 W.
What will be an ideal response?
1520 N
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a. Valles Marineris b. Ishtar Terra c. Tharsis Bulge d. Lobate Scarp e. Phobos
A cable is 50.0 m long and has a diameter of 2.50 cm. A force of 10,000 N is applied to the end of the cable. If the maximum stretch allowed in the cable is 2.00 mm, then what is the minimum tensile modulus allowed?
a. 
b. 
c. 
d. 
e. 
It would be easier to pull the evacuated Magdeburg hemispheres apart if they were
A) held upside down. B) at sea level. C) 20 km beneath the ocean surface. D) 20 km above the ocean surface. E) none of the above
A fossil is found in a layer of strata above one layer dated at 2 million years. From this we can deduce the age of the fossil to be
A) we can tell nothing about the fossil's age from this data B) younger than 2 million years C) between 2 and 3 million years old D) older than 3 million years