Points] A heated box is hanging in a thermal vacuum chamber. The box is 6" x 6" x 6". It is made of aluminum and painted with A-276 white paint. The box is of uniform temperature and is raised to 100oC using its own heaters. How much power is required

Ahelical coil spring has a mean diameter of 50 mm, a wire diameter of 5.5 mm and is wound with a pitch of 10 mm. the spring steel has an ultimate strength of 1250 mpa. find the force needed to compress the spring solid and the wire stress in this condition. state whether the spring will return to its initial length.