An eighteen-wheeler truck of mass 42.0x10 kg moves a speed of 32.0 m/s on a highway. Determine (a) How much work is required to slow it down to 5.00 m/s? (b) If the maximum frictional force that the road can exert on the truck is 2.00x10$N, what is the truck's displacement during that process? Ignore air resistance. Use energy approach.
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- A mechanic pushes a 2480-kg car from rest to a speed of ?v, doing 4.66e3 J of work in the process. During this time, the car moves 25.7 m. (Neglect the friction between car and road.) (a) Find ?v. m/s ( ± 0.02 m/s) (b) Determine the horizontal force exerted on the car. N ( ± 2 N)A 7.80-g bullet moving at 560 m/s penetrates a tree trunk to a depth of 4.80 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 motorcyclist drives up a 3.1-meter tall ramp and leaves the ramp with a speed of 42.5 m/s. If his speed is 37.8 m/s when he reaches the peak of his path, what is the maximum height (in m) above ground that he reaches? (Use energy, not kinematic equations.)
- 1. A jeep with mass of 2000 kg is going 18 m/s at the bottom of a hill that is 50.0m high. When it reaches the top, it is travelling at 10m/s. (a) what is the total work done by all forces (the jeep engine, the mud, gravity, etc) as it ascends the hill? (b) What is the minimum work required by engine of the jeep if only the engine and gravity are doing work (if there is na friction, forces from mud, etc)?A 12.0 kg box is given an initial push that starts it sliding across the floor. It eventually comes to a stop. If the box has an initial velocity of 3.5 m/s, how much work is done by friction to cause it to come to a stop? (Yes, you are correct, you do not know the coefficient of friction.)Estimate the kinetic energy (in GJ) of a 96,000 metric ton aircraft carrier moving at a speed of at 22 knots. You will need to look up the definition of a nautical mile to use in converting the unit for speed, where 1 knot equals 1 nautical mile per hour.
- Suppose the ski patrol lowers a rescue sled carrying an injured skiier, with a combined mass of 77.5 kg, down a 60.0° slope at constant speed, as shown in the Figure. The coefficient of kinetic friction between the sled and the snow is 0.100. b)How much work, in joules, is done by the rope on the sled over this distance?A 7.80-g bullet moving at 590 m/s penetrates a tree trunk to a depth of 5.60 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. N=(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. s=Assume that before the accident happened, the car was going at a constant velocity of 60Km/h on a level highway for a distance of 10.0km. The car accelerated briefly to 70.0Km/h to pass another car and then returns to 60.0Km/h as it descends the other side of the hill, even though the driver has taken her foot off the accelerator. Describe the energy transformations taking place when the engine was not doing the work.