Learning Goal: Power and Work - KE Theorem A suitcase is being lifted upward by a string wrapped around a pully The machine that controls the pully and the string has a power of P = 1.5 hp . lhp = 746 Watt 2 The suitcase' mass is m = 21.8 kg The magnitude of the gravitational acceleration is 9.80 m/s Part B - How much work is done by the machine that controls the pully and the string in lifting the suitcase upward through a displacement of 14.4 m at a constant speed? Round to an integer. unit is Joules. Work Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining The correct answer does not depend on: ooo- Part C - How much time does the machine (that controls the pully and the string) spend in lifting the suitcase upward through a displacement of 14.4 m ? Keep 2 digits after the decimal point.. unit is Seconds. time Submit Request Answer Case 2: A car whose mass is 1000 kg wants to accelerate from rest to a speed of 60 mph (miles per hour) in 8.0 S . Ignore friction. Part D - Convert 60 mph to m/s. 1 mile = 1609 m, 1 hour = 3600 s Keep 2 digits after the decimal point. unit is m/s Case 2 speed Vf m,'s Submit Request Answer Part E - Calculate the work done by the engine force in achieving this speed increase. Note: this work can be calculated even though the engine force and/or displacement are not given explicitly. If you are not sure about how, open the "hints". Keep O digit after the decimal point. unit is Joules. View Available Hint(s) Case 2 Work by engine force Submit Part F Case 2: What is the horsepower of the car's engine? The time of the speed increase is 8.0 s .