A boxcar of mass 200 tons at rest becomes uncoupled on a 1.5° grade. If the track is considered to be frictionless, what speed does the boxcar have after 10 seconds?
a. 0.37 m/s b. 0.59 m/s
c. 2.6 m/s d. 4.3 m/s
c
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To determine the location of the center of mass of a car, the car is driven over a scale. When the front wheels are over the scale, the weight recorded by the scale is 5800 N, and when the rear wheels are over the scale, the scale reads 6500 N
The distance between the front and rear wheels is 3.20 m. How far behind the front wheels is the center of mass located? A) 0.845 m B) 1.50 m C) 1.59 m D) 1.69 m E) 1.72 m
A main-sequence star's luminosity can directly inform us of
A) the star's radius. B) the rate at which it converts hydrogen to helium. C) the star's mass. D) the star's distance from us.
A concave mirror with a radius of 20 cm creates a real image 30 cm from the mirror. What is the object distance?
A) 50 cm B) 20 cm C) 15 cm D) 7.5 cm E) 5.0 cm
A G2 I star is ____________________ in diameter and ____________________ luminous than the sun
Fill in the blank(s) with correct word