A steel playground slide is 5.25 m long and is raised 2.75 m on one end. A 45.0 kg child slides down from the top starting at rest. The final speed of the child at the bottom is 6.81 m/s. Find the average force of friction between the child and the slide.

Explanation:

From the question we are told that:

Height

Length

Mass

Final speed

Generally the equation for Potential Energy P.E is mathematically given by

Therefore

Initial potential energy

Generally the equation for Kinetic Energy K.E is mathematically given by

Therefore

Final kinetic energy

Generally the equation for Work_done is mathematically given by

Therefore

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27