Physics Answers

The free-throw line in basketball is 4.57 m from the basket, which is 3.05 mabove the floor. A player standing on the free-throw line throws the ball with an initial speed of 7.15 m/s, releasing it at a height of 2.44 m above the floor. At what angle above the horizontal must the ball be thrown to exactly hit the basket?

Note that most players will use a large initial angle rather than a flat shot because itallows for a larger margin of error.

The Force between two identical charge's 1.90 x10^-2 C is separated by 1 cm. What is the electric froce between the two of charges?

Find the electric force between two electrons separated by a distance of 10 cm.(The charge of an electron=-1.6x10^-19 C

The rear wheel of a 150 kg tricycle accidentally ran over a nail. The circular tip of the nail has a diameter of 0.001 m. How much pressure did the wheel of the tricycle experience assuming that the entire weight of the tricycle is concentrated on the rear wheel that ran over the nail.

How much work is needed to decrease the distance between a +15 µC charge and a -20 µC charge from 1 m to 0.25 m?

A constant force on 40n act on a body initially at rest give it an acceleration of 0.1mls for 4seconds.calculate the work done by the force

Solve the following problems completely and present your final answers in two (2) decimal places.

1. The rear wheel of a 150 kg tricycle accidentally ran over a nail. The circular tip of the nail has a diameter of 0.001 m.How much pressure did the wheel of the tricycle experience assuming that the entire weight of the tricycle is concentrated on the rear wheel that ran over the nail.
2. A medium sized car typically weighs 1000 kg.

A hydraulic system to jack the car up above an inspection pit hasfour slave cylinderswhose pistons have a cross section area of 0.01 m². The cross-section area of the master cylinder piston is 0.00125 m².

(a) What is the weight of the car?

(b) What is the minimum force that must be applied to the master cylinder to raise the car upwards?

A proton (+q) is 50nm away from an electron (-q) which is 30nm away from another proton (+2q) with

a charge +2q. What is the net electric force on +2q?

Electrical and electronics system play a very important role in our society. Identify the law governing the relationship in the operation of electrical system.

Bob and his uncle have researched ideas for a new quad trailer and gathered the tools and materials to build it, which step of the technological design process have they completed?