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Solve the following questions given below:
Question I: Calculate the terminal velocity for a pollen grain falling through the air using the drag force equation. Assume the pollen grain has a diameter of 2 µm and a density of 0.4 g/cm3.
________m/s
Question II: If this grain is released from the top of a tree (height 11 m), estimate the time it will take to fall to the ground. Hint: The pollen grain will reach its terminal velocity very quickly and will have this velocity for essentially the entire motion. Your answer will explain why pollen stays in the air for a very long time. (Assume the density of air to be 1.3 kg/m3).
_______s
Please show me step by step or type in formulas used. I am so lost!!
A 31.0 resistor and an 20.0 resistor are connected in series across a 15.0 Vbattery. Analyze the circuit to determine the values described below. (Hint, you do not necessarily need to complete the parts inthe order listed.)
One of the most efficient engines ever built is a coal-fired steamturbine in the Ohio valley, driving an electric generator as itoperates between 1870°C and 430°C. What is its maximum theoretical efficiency
A portable CD player does not have a power rating listed, but it has a label stating that it draws a maximum current of 231.0 mA. What is the maximum power consumed
An infinitely long line of charge has a linear charge density of 7.00×10^?12 C/m. How close does the proton get to the line of charge
Two people start at the same place and walk around a circular lakein opposite directions. How long will itbe before they meet
A pair of power transmission lines each have a 0.800 ? resistance and carry 694 A over 9.14 km. If the rms input voltage is 38.1 kV. Calculate the power loss in the lines
Calculate what is the total distance traveled by a vehicle if for 130 meter with a deceleration of 1.20 m/s2 and 50 meter with a deceleration of 7.10m/s2
At amusement parks, there is a popular ride where the floor of a rotating cylindrical room falls away, leaving the backs of the riders "plastered" against the wall. Assume the radius of the room is 3.25 m and the speed of the wall is 12.8 m/s when th..
A worker drives a 0.500 kg spike into a rail tie by a 2.50kg sledgehammer. The hammer hits the spike with a speed of 65.0m/s. If one-third of the hammer's kinetic energy is converted to the internal energy of the spike and hammer, how much does the t..
Our balance is maintained, at least in part, by the endolymph fluid in the inner ear. Spinning displaces this fluid, causing dizziness. What is the linear speed of the blade tip
A car slows down with an acceleration that has a magnitude of 3.5 m/s2, What was the car's initial velocity
At 20.0°C, a mainly silicon resistor has a resistance of 275 ?, and a tungsten resistor has a resistance of 752 ?. At what temperature will their resistances be equal
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