What is the AH for this reaction? Is it endothermic or exothermic? A. 25 kJ, exothermic
B. 50 kJ, endothermic
C. -25 kJ, endothermic
D. -50 kJ, exothermic

If you want to change the pitch of a sound, you have to change the

An automobile of mass 2000 kg moving at 30 m/s is braked suddenly with a constant braking force of 10000 n. how far does the car travel before stopping?

Afeather of mass 0.001 kg falls from a height of 2 m. under realistic conditions, it experiences air resistance. based on what you know about friction, what can you say about the kinetic energy of the feather as it reaches the ground? acceleration due to gravity is g = 9.8 m/s2. a. ke < 0.0196 j b. ke = 00196 j c. je = 0 j d. ke > 0.0196 j