A projectile is fired atsm/25in a direction 060above the horizontal from a rooftop of heightm40. Use energy considerations to find:(i)The speed with which it lands on the ground
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A projectile is fired atsm/25in a direction 060above the horizontal from a rooftop of heightm40. Use energy considerations to find:(i)The speed with which it lands on the ground
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- Using energy considerations, calculate the average force (in N) a 69.0 kg sprinter exerts backward on the track to accelerate from 2.00 to 6.00 m/s in a distance of 25.0 m, if he encounters a headwind that exerts an average force of 30.0 N against him. (Enter a number.)A car of mass 1580kg traveling at 22m/s is at the foot of a hill that rises 110m in 3km. At the top of the hill the speed of the car is 11 m/s. Find the average power delivered by the car's engine, neglecting any frictional losses.A 82 kg wooden box slides down a 10 m high wooden ramp which makes an angle of 40̊ with the horizontal. Calculate (a) the change in gravitational potential energy. (b) If the non-conservative work lost because of friction is 20% of box weight, find the final velocity of the box when it reaches the bottom of the ramp.
- A force of: F = (23i+16j-51K)N is applied to a particle of mass 15-kg. The particle has a speed of 10 m/s when the force is applied and is at coordinates: (6,-10,8)m. Under the application of this force. the particle moves to a new position: (25,-21,-10)m.Determine: a) The work done by the force on the particle over this interval b) The speed of the particle at the end of this intervalA 3.0 kg sled slides downward with an initial velocity of 5m/s and a height h=80 cm on an inclined plane making an angle of 30˚with horizontal. using energy methods: What is the speed of the sled at a height of 40cm if the coefficient of friction between the surfaces is 0.2?A can of beans that has mass M is launched by a springpowered device from level ground. The can is launched at an angle of a0 above the horizontal and is in the air for time T before it returns to the ground. Air resistance can be neglected. (a) How much work was done on the can by the launching device? (b) How much work is done on the can if it is launched at the same angle a0 but stays in the air twice as long? How does your result compare to the answer to part (a)?
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