A 50-kg child riding a Ferris wheel (radius = 10 m) travels in a vertical circle. The wheel completes one revolution every 10 s. What is the magnitude of the force on the child by the seat at the highest point on the circular path?
a. 0.29 kN
b. 0.49 kN
c. 0.69 kN
d. 0.20 kN
e. 0.40 kN
a
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Which of the following discoveries would cause us to re-evaluate the nebular theory for forming planets?
A) A star has 20 planets. B) A star has zero planets. C) Of the star's five terrestrial planets, one has a large moon. D) Two of the star's planets are rotating in directions backwards compared to their orbital direction. E) A star's 5 terrestrial planets orbit in the opposite direction of its 3 jovian planets.
In terms of momentum, why is a drinking glass less likely to break if it falls on a carpeted floor than falling on a hard concrete floor?
What will be an ideal response?
How can microwave ovens heat food more quickly than conventional ovens?
a. Microwaves give energy directly to the molecules in the food. b. Conventional ovens must conduct heat from the surface to the interior of the food. c. Microwaves heat the inside as well as the surface of the food. d. all of the above
An Olympic skier moving at 19.5 m/s down a 17.0° slope encounters a region of wet snow, of coefficient of friction ?k = 0.740 . How far down the slope does she go before stopping?
a. 56.7 m b. 46.7 m c. 56.1 m d. 36.7 m e. 37.4 m