A 50 kg mass swings as shown. What is the speed of this mass at point B?
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- A 2.50 kg mass is drop from rest. If it falls a distance of 25.0 m, what will its change in kinetic energy be? Assume only the gravitational force acts.A 2.50 kg mass is dropped from rest. If it falls a distance of 25.o m what will its change in kinetic energy be? Assume only gravitational force actsA 65 kg track star can get to her maximum speed of 8.5 m/s in 2.8 seconds. Calculate her power while giving herself kinetic energy.
- Your friend throws a stone that has a mass of 4kg straight down from the top of a 175m tall building with a speed of 11m/s. You throw a stone with the same mass and speed straight up. Which rock will have the greater speed when it reaches the ground?A box of mass 'm' is pushed into a spring with spring constant 'k'. The spring is displaced a total length of Δx, and then we let go of the box. From the work-energy theorem, what is the final velocity of the box after we let go?You drop a 2.20 kg book to a friend who stands on the ground at distance D = 15.0 m below. Your friend's outstretched hands are at distance d = 1.30 m above the ground (see the figure). (a) What is the speed of the book when it reaches her hands? (b) If we substituted a second book with twice the mass, what would its speed be when it reaches her hands? (c) If, instead, the book were thrown down with initial speed 6.80 m/s, what would be the answer to (a)? (a) Number i Units (b) Number i Units (c) Number i Units
- You are given a cart with mass m and initial velocity v at the top of a ramp that is h meters high. If m=250 kg, v=10m/s and h= 100m, calculate the kinetic energy, potential energ, speed, and total energy at heights h, 3h/4, h/2,h/4 and 0Keep 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.Draw a diagram of a 50 kg box sliding down a 6 meter high plane angled 30o to the horizontal. If the coefficient of friction force between the box and the plane is 0.4, what is the speed of the box at the end of the plane?
- Consider a ball thrown straight up in air. At what position is its kinetic energy at a maximum? Where is its gravitational potential energy at a maximum?A toy rocket with a mass of 389 grams is launched into the air using a spring. At position A in the diagram below, the height is 5.4 metres and the velocity is 5.9 m/s. What is the potential energy (in J) of the rocket at this location [round your final answer to one decimal place]?a 650kg roller coaster starts from rest at he top of a 76 meter tall hill. What is the speed of the coaster at the bottom of the hill?