The first law of thermodynamics relates the heat transfer into or out of a system to the change of internal and the work done on the system.

How much heat, in joules, is transferred into a system when its internal energy decreases by 155 J while it was performing 29 J of work?

Abookcase has a mass of 38 kg and the coefficient of friction between it and the floor is 0.82 what is the maximum force of friction between the bookcase and the floor a 372n b 305n c 412n d 449n

Which of the following is not a transverse wave? a) soundb) lightc) radiod) all of thesee) none of these

The particle p starts from rest at point a at time t = 0 and changes its speed thereafter at a constant rate of 2.8g as it follows the horizontal path shown. determine the magnitude and direction of its total acceleration (a) just before point b, (b) just after point b, and (c) as it passes point c. state your directions relative to the x-axis shown (ccw positive) and choose the angle with the smallest magnitude.