Formulas you can use:
K=½mv²
W=Fdcos?
?K=½mv?²-½mv?²
?K=W
P=W/t=Fv
Weight=mg
g=9.8m/s²
1)Calculate the kinetic energy of a bicyclist riding at 20 m/s. the mass of the cyclist and his bicycle is 90 kg.
2)Two students exert a horizontal force (? = 0?) of 825 N in pushing a car 35 m. Calculate the work performed on the car.
3)A 0.180 kg ball falls 2.5 m. How much work does the force of gravity do on the ball?
4)A race car speeds up from rest to 60 m/s in 0.5 seconds. Calculate the change in the car's kinetic energy. The mass of the race car is 1400 kg.
5)In number four, calculate the net work performed on the race car.
6)A cart rolls down a hallway,and experiences a friction force of 125 N. Calculate the work performed by the friction force after the cart has rolled a distance of 3.5 m.
7)A skateboard (mass = 41 kg) speeds up from 5 m/s to 13 m/s. Calculate the net work performed on the skateboard.
8)A crane exerts a vertical force of 500 N to lift a piano upward a distance of 11.5 m. (A)Calculate the work performed. (B)Calculate the power of the crane if this motion takes place in 30 seconds.
9)An engine exerts a horizontal force of 850 N to push a truck to a speed of 32 m/s. Calculate the power of the engine.
K=½mv²
W=Fdcos?
?K=½mv?²-½mv?²
?K=W
P=W/t=Fv
Weight=mg
g=9.8m/s²
1)Calculate the kinetic energy of a bicyclist riding at 20 m/s. the mass of the cyclist and his bicycle is 90 kg.
2)Two students exert a horizontal force (? = 0?) of 825 N in pushing a car 35 m. Calculate the work performed on the car.
3)A 0.180 kg ball falls 2.5 m. How much work does the force of gravity do on the ball?
4)A race car speeds up from rest to 60 m/s in 0.5 seconds. Calculate the change in the car's kinetic energy. The mass of the race car is 1400 kg.
5)In number four, calculate the net work performed on the race car.
6)A cart rolls down a hallway,and experiences a friction force of 125 N. Calculate the work performed by the friction force after the cart has rolled a distance of 3.5 m.
7)A skateboard (mass = 41 kg) speeds up from 5 m/s to 13 m/s. Calculate the net work performed on the skateboard.
8)A crane exerts a vertical force of 500 N to lift a piano upward a distance of 11.5 m. (A)Calculate the work performed. (B)Calculate the power of the crane if this motion takes place in 30 seconds.
9)An engine exerts a horizontal force of 850 N to push a truck to a speed of 32 m/s. Calculate the power of the engine.