Balances are used to measure what a. mass of an object b. volume c. force acting upon it d. level surfaces on the table

Current enters a circuit at a: 1.positive terminal 2.negative terminal 3.low potential side 4.resistor

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

Select all of the following that are equal to an impulse of 20 unitsa) force= 5, time= 5.5b) force= 25, time= 0.8c) force= 0.1, time= 200d) force= 10, time= 2(its b, c, and d)(also in order to find answer they have to add to get the unit)ex= 25x.8=20 or .1x200=20