A block of mass 2 kg slides down a curved frictionless track and then up 300 inclined plane. The coefficient of friction between the block and incline 4 m. is μ = 0.10. Use energy methods to find ymax, provided that h =
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- A rock with a mass of 2.80 kg is moving with velocity (6.20î – 1.40ĵ) m/s. (HINT: v² = ✓ · V.) (a) What is the rock's kinetic energy (in J) at this velocity? X Find the square of the initial velocity using the hint given, and then use the definition of kinetic energy, KE = mv², (b) Find the net work (in J) on the rock if its velocity changes to (8.00î + 4.00ĵ) m/s. J to calculate the kinetic energy. JA 7.80-g bullet moving at 560 m/s penetrates a tree trunk to a depth of 5.80 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. (b) Assuming the frictional force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving.A 7.80-g bullet moving at 470 m/s penetrates a tree trunk to a depth of 6.50 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. (b) Assuming the friction force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment in stops moving.
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- A 287-kg crate is being pushed across a horizontal floor by a force P that makes an angle of 17.1 ° below the horizontal. The coefficient of kinetic friction is 0.253. What should be the magnitude of P, so that the net work done by it and the kinetic frictional force is zero? Number M. UnitsA hummingbird hovers by exerting a downward force on the air equal, on average, to its weight. By Newton's third law, the air exerts an upward force of the same magnitude on the bird's wings. Find the average mechanical power (in W) delivered by a 3.60 g hummingbird while hovering if its wings beat 75.0 times per second through a stroke 3.98 cm long. HINT To find the average power per stroke, calculate the work done each stroke and divide by the time per stroke. Click the hint button again to remove this hint.A four-meter chain hangs from a ceiling. The chain has a density of 1.5 kilograms per meter. Find the work done if the lower end of the chain is lifted to the ceiling so that it is level with the upper end.