A flatbed truck is carrying a 20.0-kg crate up a sloping road. The coefficient of static friction between the crate and the bed is 0.400
What is the maximum angle of slope that the truck can climb at constant speed if the crate is to stay in place? A) 0.381°
B) 13.1°
C) 21.8°
D) 23.6°
E) 66.4°
C
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In the vicinity of what frequency does an object with a temperature of 1000 K radiate the largest amount of power? (c = 3.00 × 108 m/s, Wien displacement law constant equals 2.90 × 10-3 m ? K, ? = 5.670 × 10-8 W/m2 ? K4)
A) 1.0 × 1014 Hz B) 8.0 × 1014 Hz C) 2.3 × 1014 Hz D) 6.7 × 1014 Hz E) 4.1 × 1014 Hz
Stars twinkle when seen from Earth. When seen by an astronaut on the Moon, stars
A) twinkle more. B) twinkle less. C) don't twinkle.
A block of mass m sits at rest on a rough inclined ramp that makes an angle ? with the horizontal. What must be true about the force F that the ramp exerts on the block perpendicular to the surface of the ramp?
A) F > mg B) F > mg cos ? C) F > mg sin ? D) F = mg cos ? E) F = mg sin ?
An object is placed a distance y0 = ?2f in front of a convex lens of focal length f that is located at y = 0. An identical object is placed a distance src="https://sciemce.com/media/2/ppg__cognero__Chapter_38_Refraction_and_Images_Formed_by_Refraction.__media__d6cfb994-f739-41c2-bd4d-9b0007a4e784.PNG" style="vertical-align: -9px;" width="48px" height="26px" align="absmiddle" />, is
in front of a concave lens of focal length ?f that is located at 
. The difference between the two image positions,
A. 
.
B.
C. 
.
D.
E. 
.