A 50-kg box is being pushed along a horizontal surface. The coefficient of static friction between the box and the ground is 0.65, and the coefficient of kinetic friction is 0.35
What horizontal force must be exerted on the box for it to accelerate at 1.2 m/s2?
A) 230 N B) 60 N C) 120 N D) 170 N E) 490 N
A
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The Greenland ice sheet can be one km thick. Estimate the pressure underneath the ice where it is 0.80 km deep. (The density of ice is 918 kg/m3.)
a. 9.0 × 10^5 Pa (9 atm) c. 7.2 × 10^6 Pa (72 atm) b. 2.5 × 10^6 Pa (25 atm) d. 9.0 × 10^6 Pa (90 atm)
An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the plane were to fly in the same 500-m circle at a speed of 300 m/s, by what factor would its centripetal acceleration change?
a. 0.25 b. 0.50 c. 1.00 d. 2.00 e. 4.00
The image in a pinhole camera is
A) always inverted. B) sometimes inverted. C) always right-side up.
If the volume of an object doubles with no change in mass, its density would be
A) half. B) double. C) unchanged.