The total is 21. If you use a calculator or count with your fingers it can help make the answer easier so in the end you will get 21 as your total.
<span>the gravational potential energy of anything on the ground is zero. When calculating potential energy you take height in meters and multiply it by the mass of the object in kilograms and the acceleration of gravity to get a new unit called Joules.
Any object at ground level has a potential energy of zero newtons becuase anything multiplied by zero is zero. An object with mass of 54 kg, 4 meters above the ground has a gravitatinal potential energy of 2116.8 Joules.</span>
<span>Easy, take the top off your Thermos bottle filled with hot coffee. Assuming perfect insulation, that hot coffee is isolated from the environment; but when the top is opened the heat can now escape to that environment.
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B. venus. although mercury is closest to the sun, venus is hotter, day & night. heat can escape mercury which is why it gets cold despite being so close to the sun. however venus is hottest because whenever heat gets there it never leaves due to the atmosphere venus has.
