An automobile travels on a straight road at 30 km/h How long will it take to travel 40 km

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j ?

Jasmine is diving off a 3-meter springboard. her height in meters above the water when she is x meters horizontally from the end of the board is approximated by the equation h=-x^2+3x+3. what is the maximum height jasmine will reach on her dive?

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?