Final Exam Physics 105 turnip weighed 17.7 kg (39 lb 3 oz) and was grown by Scot

Question

Final Exam Physics 105 turnip weighed 17.7 kg (39 lb 3 oz) and was grown by Scott and Mardie Robb (both in the USA) who presented it at the Alaska State Fair, in Palmer, USA on September 1, 2004. With what force does the Earth pull downward on the turnip gravitationally? a. 17.7 kg b. 566 N c. 1254 lb d. 384 N e. 39 lb 20.Accord to the Guiness Book of World Records, the world's heaviest Can you tell the difference between mass and weight? Trivia: turnips are related to mustard. 21·? What is the minimum speed needed by the roller coaster car (shown at the right) in order to just barely make it over the second hill? h2 15.0 m 22. The triangle at the right is stationary in place, leaning against a corner wall. Which of the following free-body (force) diagrams below best represents the forces on the triangle? a. b. C. d. e. 23. If the wheel shown at the right begins to rotate in the direction shown, which attached letter will have the smallest linear speed? a. A b.? ?.? d. D e. All are the same. 24. If the wheel shown at the right begins to rotate in the direction shown, which attached letter will have the smallest kinetic energy? a. A b.? ?.? d. D e. All are the same.

Explanation / Answer

20) a although none of the options are technically correct, a is the closest one.

21) a

22) c

23) d because other points will also have additional speed due to rotation, whereas center point will move forward without rotation

24) d for the same reason

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