An energy-efficient water heater draws 4 amps in a 220-volt circuit. it costs $75 more that a standard water heater that draws 18 amps in a standard 115-volt circuit. if electricity costs 10 cents per kilowatt-hour, how long would you have to run the efficient water heater to recoup the difference in price? show your calculations.

Aball horizontally thrown from a cliff at 8m/s

See the attachment and solve question 5th

The particle p starts from rest at point a at time t = 0 and changes its speed thereafter at a constant rate of 2.8g as it follows the horizontal path shown. determine the magnitude and direction of its total acceleration (a) just before point b, (b) just after point b, and (c) as it passes point c. state your directions relative to the x-axis shown (ccw positive) and choose the angle with the smallest magnitude.