Suppose a small metal object, initially at a temperature of 60 degrees, is immersed in a room which is held at the constant temperature of 90 degrees. It takes 3 minutes for the temperature of the object to reach 75 degrees. Calculate the heat transfer coefficient
r
, i. e. the constant of proportionality in the differential equation that describes Newton's law of cooling.

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.

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

What determines the amount of inertia an object has