astone throun from top of building up ward at angle 30° to the horizontal with an initial speef 30 m/s as show in the figure neglect air resistances . a, the horizontal distance from the point of projection to the point where astone stricks the gruond

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

The number of passengers who arrive at the platform of a subway station for the 10 am train is a random variable with a mean of 120 and a variance of 16. find the lower bound of the probability that there will be between 100 and 140 passengers (round off to second decimal place).

Consider the growth of a 20-nm-diameter silicon nanowire onto a silicon wafer. the temperature of the wafer surface is maintained at 2400 k. assume the thermal conductivity of the silicon nanowire is 20 wm-1k-1 and all its surfaces including the tip are subjected to convection heat transfer with the coefficient h = 1×105 wm-2k-1 and t∞ = 8000 k. when the nanowire grows to l = 300 nm, what is the temperature of the nanowire tip (t (x =