(5 pts) 1. You tie a cord to a pail of water and you swing the pail in a vertica
ID: 1538271 • Letter: #
Question
(5 pts) 1. You tie a cord to a pail of water and you swing the pail in a vertical circle of radius 0.800 m. What minimum speed must you give the pail at the highest point of the circle if no water is to spill from it? (a) 0.800 m/s b b 2.80 m/s (c) 3.13 m/s (d) 7.84 m/s (e) none of the above answers (5 pts) 2. A box with mass 10.0 kg is pulled up a ramp by a force F 20.0 N. The ramp is inclined at 36.0° above the horizontal and the force F is at an angle of 62.00 above the horizontal. How much work is done by the force when the box travels a distance of 3.00 m along the ramp? (a) zero (c) 48.5 J (e) 57.1 J (f none of the above answers (5 pts) 3. On a horizontal frictionless surface block A (mass 20 kg collides with a block B (mass 2 kg) that is initially at rest. Which ofthe following statements is correct? (a Block B undergoes a greater magnitude of change in momentum than block A. b Block A undergoes a greater magnitude of change in momentum than block B. C C Both blocks undergo the same magnitude of change of momentum.
Explanation / Answer
As you asked multiple questions , so I m bound to answer first one.
(a)
radius r = 0.8 m
minimum speed at highest point v = sqrt[ r g ]
= sqrt[ 0.8 *9.8 ]
= 2.8 m / s
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