For its size, the commonflea is one of the most accomplished jumpers in the animal world.A 2.0-mm-long, 0.50 mg flea can reach a height of 20 cm in a singleleap. Ignoring air drag, what is the takeoff speed of such a flea?
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For its size, the common
flea is one of the most accomplished jumpers in the animal world.
A 2.0-mm-long, 0.50 mg flea can reach a height of 20 cm in a single
leap. Ignoring air drag, what is the takeoff speed of such a flea?
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- A student with mass 60 kg starts from rest and slides down a frictionless slide that is 5 m high. What is the student's speed at the bottom of the slide?A ball has a mass of 0.150 kg and is given an initial speed of 20.4 m/s. When the ball is at a height of 15.3 m above the point it is thrown, what is its speed? Ignore air resistance.1. A girl jumps upward off a trampoline with a speed of 3.6 m/s. How high will she rise? Ignore air resistance. Previous submissions:
- 1.A sled slides without friction down a small, ice-coveredhill. If the sled starts from rest at the top of the hill, its speed atthe bottom is 7.50 m/s. (a) On a second run, the sled starts witha speed of 1.50 m/s at the top. When it reaches the bottom ofthe hill, is its speed 9.00 m/s, more than 9.00 m/s, or less than9.00 m/s? Explain. (b) Find the speed of the sled at the bottomof the hill after the second run. Draw and Explain.We drop a plastic ball to the floor from a height of 2.0 m and let it bounce several times. 30% of energy is lost with each bounce. How much time passes between the first and second bounce and between the second and third bounce?= A large spring with spring constant k 550 N/m is oriented vertically on a table. When the spring is at its relaxed length, a book with mass m = 1.3 kg is gently placed on top and released from rest. Through what vertical distance d has the book dropped when the spring reaches its maximum compression? What is the book's speed when it is halfway between its release position and its lowest position?
- You cast a pebble at 2.4 m/s at a pond from 0.8 m above ground. How fast is it when it is about to land in the pond .5 m below the ground? Hint: use mechanical energy conservation. The direction of the velocity is irrelevant. It doesn't have to travel straight up or down. Pebble's final position is negative.A ball of mass 0.5kg is tied to a string of length 1.0 meters, and the other end of the string is tied to a rigid support. The ball is held straight out horizontally and is then released. a) What is the speed of the ball at the lowest point of its motion? b) What is the tension in the string at its joint? Solution FBD and Formula RequiredFor its size, the commonflea is one of the most accomplished jumpers in the animal world.A 2.0-mm-long, 0.50 mg flea can reach a height of 20 cm in a singleleap. If a 65 kg, 2.0-m-tall human could jump to the same height compared with his length as the flea jumps compared with its length, how high could the human jump, and what takeoff speed would the man need?
- pervious question: OK, same sort of track, but now with d = 2.12 m. Now suppose the blocks starts on the track at x = 4.10 m. The block is given a push to the left and begins to slide up the track, eventually reaching its maximum height at x = 0, at which point it turns around and begins sliding down. What was its initial speed in this case? New question Here we go again this time, d = 4.09 m. Suppose the block starts on the track at x = 0. What minimum initial velocity (moving to the right) must the block have such that it will leave the track at x = 0 and go into freefall? 12.24 m/s 11.15 m/s 8.96 m/s 6.34 m/sA 3200 kg roller coaster car descends from rest at the top of a steep section of track 82 m high. What is the speed of the car at the bottom of the track?A tumbleweed rolls off a 120m high cliff with a speed of 23.6 m/s. What would the final velocity of the tumbleweed before striking the ground be if there were no air resistance?