The Brown's want to move this boulder from the front yard. They cannot budge the large rock, so they use a board as a lever. Mr. Brown pushes down on the lever with a force of 85 N. The boulder moves out of the hole and into the air, a total distance of 1.33 meters. How much work is accomplished while moving the boulder

Abar magnet cut in half will form a total ofpoles. a)fourb)eightc)two

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)

Adolphin emits ultrasound at 100khz and uses the timing of reflections to determine the position of objects in the water. part a what is the wavelength of this ultrasound? assume that temperature of water is 20 degrees c. answer in cm