Question

4. A child sitting 2 meters from the center of a merry-go-round moves at a speed of 2 m/s. Calculate (A) the centripetal acceleration of the child and (B) the horizontal force exe child (mass 22.5 kg). (A) 1 m/s2 b. 2 m/s2 c. 3 m/s2 d. 4 m/s2 e. 5 m/s2 a. 22.5 N b. 45 N c. 67.5 N d. 90N e. 112.5 N 5. If Earth was moved to a new orbit that was twice as far from the Sun, what would be the change in the gravitational attraction? a. The gravitational attraction would be the same b. The gravitational attraction would be twice its present value. c. The gravitational attraction would be one half of its present value. d· The gravitational attraction would be one quarter ofits present value. e· The gravitational attraction would be one eighth of its present value. 6. A car drives a steady speed around a perfectly circular track. a· The car's acceleration is zero. b· The net force on the car is zero. c. Both the acceleration and net force point outward. d. Both the acceleration and net force point inward. e. If there is no friction, the acceleration is outward. 7. When you watch an apple falls to Earth, it accelerates at the rate of-9.8 m/s?. How fast does the Earth accelerate toward the apple? a. 0 m/s2. The Earth remains still. b. 4.9 m/s. They meet halfway c. -9.8 m/s. They accelerate at the same rate and direction. d. +9.8 m/s. The Earth's acceleration is in the opposite direction. e. None of the answers above is correct. I have a different answer. What? 8. Earth's orbit has an elliptical shape. From Kepler's laws for planetary motion, during which month will Earth's speed be the greatest. Month

Answer 1

december to january

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