An iron weight, suspended by a string, is motionless. The tension in the string is 4. 75 newtons. What is the mass of the iron weight? A. 0. 485 kilograms B. 4. 75 kilograms C. 9. 65 kilograms D. 10. 0 kilograms E. 15. 5 kilograms.

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

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.