A student conducts an experiment to determine how the temperature of water affects the time for salt to dissolve in 100 mL of water. The student makes one measurement for each temperature. What is one way that the student could improve the experiment?

perform multiple trials for each measurement instead of just one

use a different timer for each temperature of water

use a different type of salt for each temperature of water

perform one trial for each measurement but use a different volume of water for each test

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Complete the statement about memory improvement. ( )involves organizing and breaking down information into easier groups to expand capacity. rehearsal is the verbal repetition of information. these techniques are especially important for the improvement of ( ) memory.

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)