Question 15 (1 point) While ice is melting, it absorbs 334 kJ of heat per kilogram of ice. This takes place at
a constant temperature of 0°C. What is the entropy change of 4 kg of ice while it
melts? (Be careful of your energy units). (1 point)

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?