Acar of mass 960 kg is free-wheeling down an incline at a constant speed of 9.0 m s–1.
the slope makes an angle of 15° with the horizontal.
deduce that the average resistive force acting on the car is 2.4×103n
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1. this question is about the breaking distance of a car and specific heat capacity. (a) a car of mass 960 kg is free-wheeling down an incline at a constant speed of 9.0 m s–1. the slope makes an angle of 15° with the horizontal. (i) deduce that the average resistive force acting on the car is 2.4×103n.(2) (ii) calculate the kinetic energy of the car. (1) (b) the driver now applies the brakes and the car comes to rest in 15 m. use your answer to (a)(ii) to calculate the average braking force exerted on the car in coming to rest.(2) (c) the same braking force is applied to each rear wheel of the car. the effective mass of each brake is 5.2 kg with a specific heat capacity of 900 j kg–1 k–
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Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?