Question

The figure shows a pendulum of length L = 2.8 m. Its bob (which effectively has all the mass) has speed v0 when the cord makes an angle θ0 = 45° with the vertical. (a) What is the speed of the bob when it is in its lowest position if v0 = 6.0 m/s? What is the least value that v0 can have if the pendulum is to swing down and then up (b) to a horizontal position, and (c) to a vertical position with the cord remaining straight? (d) Do the answers to (b) and (c) increase, decrease, or remain the same if θ0 is increased by a few degrees? (a) Number Enter your answer in accordance to item (a) of the question statement Units Choose the answer from the menu in accordance to item (a) of the question statement (b) Number Enter your answer in accordance to item (b) of the question statement Units Choose the answer from the menu in accordance to item (b) of the question statement (c) Number Enter your answer in accordance to item (c) of the question statement Units Choose the answer from the menu in accordance to item (c) of the question statement (d) Choose the answer from the menu in accordance to item (d) of the question statement

Answer 1

Answer:

could u help me w/ this

Explanation:

You are out and about in the country and your father sees a rock that he really wants in the yard. Now you must get the very heavy rock into the back of a truck. The truck bed is 3 feet off the ground. Your father pulls out a 5-foot plank and begins to set up a ramp. At the same time, you (who know about mechanical advantage!) have found a plank that is 8 feet long, and you show it to your father.

Which plank will give you the most mechanical advantage? Calculate the MA for each plank.

Answer 2

Answer: lil timmy this one is hard but the answer is b

Explanation: