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Q. A spherically-shaped bacteria cell has a mass of 1ug and a diameter of 1.00 um. Suppose the cell completely absorbs light. Take its cross-sectional area to be a circle with a radius equal to that of the cell. You want to use a laser to manipulate the cell.
(i) What intensity laser would you need to levitate the cell?
(ii) Assume that the cell is floating on the surface of water, and that the water surface has a coefficient of friction of u=0.300. You now want to use a laser to move cell horizontally, along the surface of the water. What intensity laser would you require if you wanted cell to attain a horizontal velocity of 1.0 um/s after 15.00 seconds of laser illumination?
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A 4.40 kg block is pushed along a floor by a constant applied force that is horizontal and has a magnitude of 40.0 N. it gives the block's speed v versus time t as the block moves along an x axis on the floor. The scale of its vertical axis is set by..
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A 54 {rm kg} ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.5 turns each second. The distance from one hand to other is 1.5 {rm m}. Biometric measurements indicate that each hand typically..
A 15.0{rm cm}-diameter non-conducting sphere carries a total charge of 2.25 mu {rm C}, distributed uniformly throughout its volume. Graph the electric field E as a function of the distance r from the center of sphere from r = 0 to r = 30.0{rm{ cm}..
On a cool morning, when the temperature is 14 degrees C, you measure the pressure in your car tires to be 30 psi. After driving 50 mi on the freeway, temperature of your tires is 52 degrees C.
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