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A cream pie (m = 0.80 kg) is fired out of a circus cannon with an initial speed of 19 m/s from a height of 2.50 m. The pie follows a parabolic path, eventually hitting a clown in the knees with a speed of 20 m/s during its descent.
a) Calculate the initial kinetic energy of the cream pie as it leaves the cannon.
b) Calculate the initial gravitational potential energy of the cream pie as it leaves the cannon.
c) Calculate the final kinetic energy of the cream pie just as it hits the clown’s knees.
d) Use the Law of Conservation of Energy to calculate the final gravitational potential energy of
the cream pie when it hits the clown’s knees.
e) Calculate the final height of the cream pie as it hits the clown’s knees.
A hockey bag (m = 18 kg) is dragged across the arena floor by a hockey player who applies a horizontal force of 99 N against a kinetic friction force of 87 N.
a) Calculate the work done on the hockey bag over a displacement of 9 m.
(i) By the hockey player.
(ii) By the force of kinetic friction.
b) Calculate the net (total) work done on the hockey bag.
c) Calculate the change in the kinetic energy (ΔEK) of the hockey bag.
An iPhone at rest on a 0.76 m tall desk has 1.296 J of gravitational potential energy. Calculate the mass of the iPhone.
A net force of 1500 N acts on a car over a displacement of 105 m. Calculate the net (total) work done on the car.
A braking force of 6000 N was applied to a 1000-kg automobile bringing it to a complete stop in 75 m.
a. How much work was done in stopping the automobile?
b. How did the kinetic energy of the automobile change?
c. What relationship could be used to find the initial velocity of the automobile before the brakes were applied?
d. Calculate the initial velocity of the automobile before the brakes were applied.
calculate the refractive index of a material when A is 600 and d is +2
A model for climate change predicts that global temperatures will continue to rise. Soon after the model is presented, a town has a massive snow storm. What does this tell us about the model?
Warner is hiding a 1500 g of goldbar with a temperature of 30 ̊C inside a
tank full of water with a temperature of 97 ̊C. If the mass of water is 30 kg,
calculate the final temperature of the gold bar. ( Specific Heat Capacity of
gold is 129 J/kg ̊C, water is 4200 J/kg ̊C)
Two forces F1 and F2 act on a particle. F1 has magnitude 5N and in direction 030° and F2 has magnitude 8N and in direction 090°. Find the magnitude and direction of their resultant. [ 11.36N; 067.6°
PLEASE ID APPRECIATE YOU ANSWERING THIS SO SOON...
It’s
add or subtract the following vectors and write down the vector result.
a) 200N-> + 100N-> =
b) 300m -> + <-100m=
c) 25N-> + 7N-> + <- 9N + 12N-> =
d) 6 miles north and 13 miles south =
e) 83m/s east and 51m/s south =
another questions
1) a man walks 2.6 miles east then turns and walks 6.7 miles north. Where is he in relation to his starting point?
2) Find the displacement done by an object towards east if you know that it made 25m displacement towards north and the total result of this situation is 40m.
