If the power company charges us 7.00 cents/ kW●h for electricity, what does it cost to operate the 2,100.00 W hairdryer for 28.00 minutes?

Determine the maximum r-value of the polar equation r =3+3 cos 0

The volume of a gas is halved during an adiabatic compression that increases the pressure by a factor of 2.5. what is the specific heat ratio? show the math steps .

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?