A 2200 kg truck is decelerated from 22 m/s to 12 m/s in 3.2 s, as its driver sees a deer wander into the road. What was the magnitude of the net force that slowed the truck?
A. 8.3 kN
B. 23.4 kN
C. 6.9 kN
D. 15.1 kN
C. 6.9 kN
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Friction: A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30. A horizontal 140-N force is applied to the box. What is the friction force on the box?
A. 140 N B. 160 N C. 16.5 N D. 0.00 N E. 42 N
A space station in the form of a large wheel, 120 m in diameter, rotates to provide an "artificial gravity" of 3.00 m/s2 for persons located at the outer rim. Find the rotational frequency of the wheel (in revolutions per minute) that will produce this effect.
What will be an ideal response?
Traveling at their current speeds, how long would it take the Pioneer and Voyager probes to travel the distance to the nearest stars?
A) at least 100,000 years B) several billion years C) around 4.4 years D) about a 1,000 years
A tightrope walker with a mass of 60.0 kg stands at the center of a rope which was initially strung horizontally between two poles. His weight causes the rope to sag symmetrically, making an angle of 4.80° with the horizontal
What is the tension in the rope? A) 359 N B) 589 N C) 1760 N D) 2470 N E) 3520 N