How much energy is required to raise the temperature of 8 kg of water at 33°C to 100°C​

Occurs when an energy source transfers heat directly to another subject space; an example would be an object becoming warm by sitting in the sunshine

The 10-kg double wheel with radius of gyration of 125mm about o is connected to the spring of stiffness k = 600 n/m by a cord which is wrapped securely around the inner hub. if the wheel is released from rest on the incline with the spring stretched 225 mm, calculate the maximum velocity v of its center o during the ensuing motion. the wheel rolls without slipping

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?