A metallic wire of resistivity 2x 10-7Ω.m, has a section of 1 mm diameter & a resistance of 2.55 Ω. An electric current I passes through it. The electric energy consumed during 5 min. is 150 J. a. Calculate the length L of the wire.
b. Calculate the quantity of electricity that crosses the wire during 0.025 hours. (4pts)

Apulley with a mechanical advantage of 5 will require you to pull times the amount of rope. a. 1/5 b. 5 c. 10 d. 15

The 5-kg cylinder is initially at rest when it is placed in contact with the wall b and the rotor at a. if the rotor always maintains a constant clockwise angular velocity v = 6 rad> s, determine the initial angular acceleration of the cylinder. the coefficient of kinetic friction at the contacting surfaces b and c is mk = 0.2.

The volume of a gas is halved during an adiabatic compression that increases the pressure by a factor of 2.5. what is the specific heat ratio? show the math steps .