Series-MCX2 is for practice, only.
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1. What is the magnitude of the total force on a driver by the dragster he operates as it accelerates horizontally along a straight line from rest to 60 m/s in 8.0 s? (mass of driver = 80 kg)
0.60 kN 0.78 kN 1.4 kN 0.99 kN
2. A 6.0-kg object is suspended by a vertical string from the ceiling of an elevator which is accelerating upward at a rate of 1.8 m/s^2. Determine the tension in the spring.
11 N 70 N 48 N 59 N
3. A 70-kg stunt artist rides in rocket sled which slides along a flat inclined surface. At an instant when the sled's acceleration has a horizontal component of 6.0 m/s^2 and a downward component of 2.8 m/s^2, what is the magnitude of the force on the rider by the sled?
0.83 kN 0.98 kN 0.65 kN 0.68 kN
4. A rock attached to a string swings in a vertical circle. At the highest point:
Two forces act on the rock, and their resultant is not zero. Only one force acts on the rock. Two forces act on the rock, and their resultant is zero. Three forces act on the rock.
5. A 1.4 kg block is pushed up a frictionless 14 degree incline from point A to point B by a horizontal force of magnitude F=6.0 N. Points A and B are 1.2 m apart. If the kinetic energies of the block at A and B are 3.0 J and 4.0 J respectively, how much work is done on the block by the force F between A and B?
7.2 J 3.0 J 5.0 J 1.0 J
6. A 2.0 kg block is projected down a plane that makes an angle of 20 degrees with the horizontal, with an initial kinetic energy of 2.0 J. If the coefficient of kinetic friction between the block and plane is 0.40, how far will the block slide down the plane before coming to rest?
3.0 m 1.8 m 0.30 m 1.0 m
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