There was a crash between a red car and a black car and the insurance agency wants to determine if the black car was speeding. Analyzing the skid marks on the road, the
insurance agency determines that the brakes on that car create an acceleration of -5.8
m/s2. The distance of the skid mark was 11 m. Using footage from a camera at a local
convenience store, they determined that the car was braking for 1.3 s. The speed limit in
that area is 11 m/s (25 mph). How fast was the car going before it started breaking. Was it
speeding? No, the car wasn't speeding.

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)

What happens when you slowly pulled the carboard?

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block