What is the sign of the acceleration of penny

Reference no: EM139269

Q1. A student drops a penny from the top of a tower and decides that he will establish a coordinate system in which the direction of penny's motion is positive. What is the sign of the acceleration of penny?

Q2. A 40.0 cm diameter cylinder of helium gas is 70.0 cm long and at 30.0 ^circC. The pressure gauge reads 140 psi. How many helium atoms are in the cylinder?

Reference no: EM139269

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