A ball at rest at some height h; above the ground falls to Earth. Determine its final speed before crashing into earth. Ignore air resistance. +y OOO h₁
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Q: need help on attatched question
A: Write the expression for potential energy
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- F(x) = 15x? – 4x +1 as it acts on a m ving from x=0 to x=5 m?6) In a downhill ski race, surprisingly, little advantage is gained by getting a running start. (This is because the initial kinetic energy is small compared with the gain in gravitational potential energy even on small hills.) To demonstrate this, find the final speed in m/s and the time taken in seconds for a skier who skies 64.0 m along a 29° slope neglecting friction for the following two cases. (Enter the final speeds to at least one decimal place.) (a) starting from rest final speed _____m/s time taken _____s (b) starting with an initial speed of 3.00 m/s final speed _____m/s time taken _____s (c) Does the answer surprise you? Discuss in detail why it is still advantageous to get a running start in very competitive events.A coin is tossed straight upward into the air so that it reaches a maximum height after 6s (neglect the air friction) what is its initial speed ?
- Keep the track tilted at 7∘∘ with the horizontal, at let the cart roll downwards. The length of the track is 75 cm. Starting from zero speed at the top of the track, what will be the speed of the cart as it reaches the bottom? Write your answer in m/s, and ignore friction. Mass of the cart = 250 grams.For the gravitational field of a large massive object, such as the sun, what is the gravitational potential energy of a smaller mass very, very far away? O mgh O 42What would be Tom´s gravitational potential energy at the roof of the empire state building if it has an altitude of 1250 feet (380 meters) and his weight is equal to 600N?.
- If a spring-operated gun can shoot a pellet to a maximum height of 100 m on Earthı, how high could the pellet rise if fired on the Moon, where g = 1.6 m/s^2?1. Given the vectors M = -10āx + 4ã, – 8ả, and Ñ = 8å, + 7ã, – 2ã,, find: a. A unit vector in the direction of -M + 2Ñ b. The magnitude of 5å, + N – 3M c. M||2Ñ|(M + N)E21) a)Write the work done by a conservative force in terms of its potential energy. b)In what direction are forces pointing to be considered centripetal? c)In a system of interacting particles, what conservation law results when ∑Fiext=? d)Anobjectexperiencingseveralforcesresultinginsomedisplacement.What is the net work done by these forces equal to If the work of one of these forces is path-dependent, then what is not conserved? e) If a frictional force causes the total mechanical energy of a system to decrease, then I) what happens to the system’s total internal energy? ii) what is truly conserved?
- A drone at too great a height drops a box. The box drops straight down the ground and hits at 100 m/s smashing the contents. Neglecting air friction, approximately, how high, in m, was the drone? O 360 O 720 O 250 O 510 O 25ho Vo hmx ... A superball is thrown straight up from an initial height h above the floor with an initial speed vo. What is the maximum height of the ball above the floor? (Assume no air resistance, no friction anywhere.)