A car travels along the perimeter of a vertical circle (radius = 0.25 km) at a constant speed of 30 m/s. What is the magnitude of the resultant force on the 60-kg driver of the car at the lowest point on this circular path?
a. 0.37 kN
b. 0.80 kN
c. 0.22 kN
d. 0.59 kN
e. 0.45 kN
c
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Two numbers, one with 4 significant figures and the other with 3 significant figures, are combined using the math operations given below. Which operation can give a result with fewer than 3 significant figures?
a. addition c. multiplication b. subtraction d. division
One mole of an ideal gas has a temperature of 25°C. If the volume is held constant and the pressure is doubled, the final temperature (in °C) will be
A. 174 B. 596 C. 50 D. 323 E. 25
A pair of stars orbit around one another in an elliptical orbit with a semi-major axis, a, of 1 AU with an orbital period, P, of 1 year. What is the mass of the pair of stars?
a. 1 solar masses b. 2 solar masses c. 4 solar masses d. 8 solar masses e. 16 solar masses
How fast do tectonic plates move on Earth?
A) quite fast, but only during earthquakes B) a few centimeters per century C) a few centimeters per year D) a few kilometers per century E) about 1 mile per hour