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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 Styrofoam ball of the same size as the lead ball takes a longer time to reach the ground. Which of the following is a good explanation for this? Briefly, describe your reasoning. Air resistance is a significant force in this problem
An instructor wants to use a lens to project a real image of a light bulb onto a screen 2.20 m from the bulb. In order to get the image to be three times as large as the bulb, what focal length lens will be needed?
a model rocket is constructed with a motor that can provide a total impulse of 36.0 nmiddots. the mass of the rocket
A 24N crate is held at rest on a frictioneless incline by a rope that is parallel to the incline. The incline is 25 degrees above the horizontal
A basketball player grabbing a rebound jumps 70.80 cm perpendicularly. How much total time (ascent and descent) does the player spend (a) in the top 11.2 cm of this jump and (b) in the bottom 11.20 cm? Do your results describe why such players see..
When an electron undergoes a transition from a higher to lower state in singly ionized helium, how will the energy of the emitted photon compare with the analogous transition in hydrogen?
At the low point in its swing, a pendulum bob with a mass of 1 kg has a velocity of 8 m/s. What is its kinetic energy at the low point
Four identical metallic objects carry the following charges: +1.68, +6.03, -4.64, and -9.66C. How many electrons (or protons) make up the final charge on each object
A cylinder contains a mixture of helium and argon gas in equilibrium at a temperature of 240 C. Boltzmann's constant is 1.38066 × 10?23 J/K, What is the rms speed of helium
An alpha particle (the nucleus of a helium atom, with charge +2 and a mass four times that of a proton), What is the speed of the antiproton when the particles are 1.6 nm apart
A projectile is fird with an inital speed ofvi=20m/s at an angle θ=30o with the horizontal. Find The maximum height reaached by the particle.
In a hydraulic lift, the maximum gauge pressure is 18.7 atm. what is the heaviest vehicle that can be lifted
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