Sam is investigating the time it takes an electric motor to lift different matters. The table shows the time is took to lift different masses: 5g-1.5s 10g-3.0s 15g-4.5s 20g-6.0s 25g-7.5s. State the name of the store that has more energy at the end than it had at the start.

An implanted pacemaker supplies the heart with 72 pulses per minute, each pulse providing 6.0 v for 0.65 ms. the resistance of the heart muscle between the pacemaker’s electrodes is 550 ω. find (a) the current that flows during a pulse, (b) the energy delivered in one pulse, and (c) the average power supplied by the pacemaker.

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.