What force is exerted on a ball of mass 100g if it accelerates from rest to 30 m/s in 3 seconds? Force = mass * acceleration
acceleration = change in velocity / time taken

The crank oa rotates in the vertical plane with a constant clockwise angular velocity ω0 of 5.6 rad/s. for the position where oa is horizontal, calculate the force under the light roller b of the 10.6-kg slender bar ab.

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.