In a shuffleboard game, the puck slides a total of 12 m before coming to rest. If the coefficient of kinetic friction between the puck and the horizontal board is 0.28, what was the initial speed of the puck?
A) 8.1 m/s
B) 29.0 m/s
C) 6.5 m/s
D) 7.3 m/s
A
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A 2000-kg sailboat experiences an eastward force of 3000 N by the ocean tide and a wind force against its sails of magnitude 6000 N directed toward the northwest (45° N of W). What is the magnitude and direction of the resultant acceleration?
What will be an ideal response?
Would you be richer if you had a hunk of gold whose weight is 1 newton on the moon, or one whose weight is 1 newton on Earth, and why?
A) 1 newton on the moon, because then the gold's weight on the moon would be larger. B) 1 newton on the moon, because then the gold's mass would be larger. C) 1 newton on Earth, because then the gold's mass would be larger. D) 1 newton on Earth, because then the gold's weight on Earth would be larger. E) It wouldn't make any difference, because the amount of actual gold would be the same in both cases.
Calculate the light intensity 1.45 m from a light bulb that radiates 100 W equally in all directions
A) 3.78 W/m2 B) 4.36 W/m2 C) 47.6 W/m2 D) 54.7 W/m2
Two blocks, joined by a string, have masses of 3.0 and 4.0 kg. They rest on a frictionless horizontal surface. A second string, attached only to the 4.0-kg block, has horizontal force = 40 N applied to it. Both blocks accelerate. Find the tension in the string between the blocks
a. 23 N b. 5.7 N c. 17 N d. 93 N e. 120 N