A man powered 30kg lawnmower is being pushed, from rest, with a force of 50N at an angle of 30 degrees below the horizontal for 10m on a level lawn in 5s. The force of friction is 20N. Find the average power output of the man on the lawnmower.
How fast is the lawnmower moving at 5 seconds?
Determine the power output of the man at exactly 5 seconds.

The energy produced as a result of this flow of electrons from atom to atom is called

Humidity is to blame for that muggy, steamy feeling you experience on some hot summer days. what gas in the atmosphere causes humidity? a) oxygen b) hydrogen c) nitrogen d) water vapor

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.