Prove that horizontal range of a projectile is same, when Ered at an angle 8 and 90° -6) with the horizontal.

Which quantities are scalars? choose all that apply a. distance b. speed c. acceleration d. velocity

If gases like carbon dioxide and methane make up less than 1% of the total atmosphere, why is it important for scientists to monitor changes in percentages of these gases?

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.