How much money can be found in the pockets/purses of the 250 students in a class if no student may carry 2 identical banknotes with them? (Give the range: minimum – maximum. Ignore coins)

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Ametal ball with a mass of 0.028 kg is dropped from rest at a height of 1.0 meters above the ground. assuming the energy in the ball is conserved, how much kinetic energy will the ball have when it is 0.5 meters above the ground?

Which of the following is the main energy source for the sun? a. fission of hydrogen b. fusion of hydrogen c. fusion of helium d. fission of iron