Atoy cannon uses a spring to project a 5.28-g soft rubber ball. the spring is originally compressed by 5.08 cm and has a force constant of 8.07 n/m. when the cannon is fired, the ball moves 15.8 cm through the horizontal barrel of the cannon, and the barrel exerts a constant friction force of 0.031 3 n on the ball.

(a) with what speed does the projectile leave the barrel of the cannon?

(b) at what point does the ball have maximum speed?

(c) what is this maximum speed?

In a good thermo flask the main cause of heat loss is

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.

Auniform crate c with mass mc is being transported to the left by a forklift with a constant speed v1. what is the magnitude of the angular momentum of the crate about point a, that is, the point of contact between the front tire of the forklift and the ground