A polar bear of mass 200. kg stands on an ice floe 100. cm thick. What is the minimum area of the floe that will just support the bear in saltwater of specific gravity 1.03? The specific gravity of ice is 0.98
What will be an ideal response?
4.00
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You ride on an elevator that is moving with constant upward acceleration while standing on a bathroom scale. The reading on the scale is
A) equal to your true weight, mg. B) more than your true weight, mg. C) less than your true weight, mg. D) zero. E) could be more or less than your true weight, mg, depending on the magnitude of the acceleration.
The rotation of the Sun's photosphere is
a. fastest at the equator, slower at mid-latitudes, and slowest near the poles. b. slowest at the equator, faster at mid-latitudes, and fastest near the poles. c. fastest at the equator, slowest at mid-latitudes and the poles which travel at the same speed . d. the same regardless of latitude.
Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A1 is 1 square inch, and the area A2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown
 The pressure on A2 in psi is a. 0.25. b. 0.4. c. 4. d. 10. e. 40.What is the spectral type of a main sequence star with a luminosity 100 times greater than the sun?
A) G B) A C) M D) O