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

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science

If no molecular collisions occurred in a sample of gas, temperature of the gas would

A) increase. B) decrease. C) be unaffected.

Physics & Space Science