To solve the problem, it is necessary to use the concepts of gravitational force, centripetal force and trigonometric components that can be extrapolated from the statement.
By definition we know that the Force of Gravity is given by

Where,
m= Mass
g = Gravitational Acceleration
The centripetal force is given by,

Where,
m = Mass
v = Velocity
R = Radius
For the case described in the problem, the Force of gravity the net component would be given by sin?, While for the centripetal force the net component is in the horizontal direction, therefore it corresponds to the 
Then,


From the radius we have its length but not the net height, which would be given by

So equating the equations we have to



Re-arrange to find v,

Replacing with our values


Therefore the tangential velocity of the mass is 0.624m/s
We assume that the gas is an ideal gas so we can use the relation PV=nRT. Assuming that the temperature of the system is at ambient temperature, T = 298 K. We can calculate as follows:
PV = nRT
P = nRT / V
P = (0.801 mol ) (0.08205 L-atm / mol-K) (298.15 K) / 12 L
P = 1.633 atm
Answer:
B
This is because frictional energy is similar to thermal energy in a system. Therefore the thermal energy produced is equal to
-2. This is because it is gaining electrons. Electrons are negative. Therefore it is a negative charge.
Answer:
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