A flatbed truck carries a load of steel. Only friction keeps the steel from sliding on the bed of the truck
The driver finds that the minimum distance in which he can stop from a speed of 20.0 mi/h without having the steel slide forward into the truck cab is 20.0 m. What would his minimum stopping distance be when going down a 10.0° incline?
153. m
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A microscope has a tube length of 20 cm. The objective’s focal length is 2.0 cm and the eyepiece focal length is 0.50 cm. What is the “approximate” magnification provided by this microscope? (The “approximate” is found using qobjective = L.)
1.–200 2.–500 3.–1000 4.–2000
Density: A round coin has a diameter of 19.55 mm, a thickness of 1.55 mm, and a mass of 2.50 g. What is its density?
A. 5.37 × 103 kg/m3 B. 21.5 × 103 kg/m3 C. 1.34 × 103 kg/m3 D. 2.68 × 103 kg/m3 E. 1.86 × 10-4 kg/m3
Noting the main sequence turnoff mass in a star cluster allows you to determine its
A) radial velocity. B) number of stars. C) distance. D) total mass. E) age.
If no molecular collisions occurred in a sample of gas, temperature of the gas would
A) increase. B) decrease. C) be unaffected.