A 2.0 kg mass traveling at 3.0m/s strikes another 2.0kg mass traveling at -1.0m/s. They collide and have a perfectly elastic collision. If the second mass is moving at 3.0m/s after the collision,
what is the speed and direction of the first mass?

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

It can take some of those large , industrial vehicles up to feet to stop when traveling only 60 mph, and therefore , you shoukd be mindful to not be jn the traffic right in front of them a. 100 feet b. 200 feet c. 335 feet d. 425 feet

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.