Please help!! What is the change in the internal energy if 90 J of thermal energy is added to a system, and the system does 30 J of work on the surroundings? A. -130 J B. 130 J C. 60 J D. -60 J

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

Based on this activity, is kinetic energy always transformed into potential energy?

What will happen in a hybrid vehicle if current flow becomes too high due to a short?