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In a dramatic lecture demonstration, a physics professor blows hardacross the top of a copper penny that is at rest on a level desk.By doing this at the right speed, he can get the penny toaccelerate vertically, into the airstream, and then deflect it intoa tray, as shown in the figure . Assuming the diameter of a pennyis 2.10 cm and its mass is 2.50 g, what is the minimum air speed needed to lift the penny off the table top? Assume the air under the penny remainsat rest.
An engine with an output of 267.0 W has an efficiency of 39.0 %. It works at 9.00 cycles/s. How much heat is rejected each cycle
A kid of mass 30 kg is initially at the center of a merry-go-round, which we can model as a uniform disk. What is the angular speed of the merry-go-round now in rev/min
q1. consider a 3.0kg ball and a 5.4kg ball in free fall.what is the net force performing on each?what is the
Three point mass particles are located in a plane: 3.67 kg located at the origin, How far is the center of mass of the three particles from the origin
A uniform sphere with mass 57.0kg is held with its center at the origin, What is the magnitude of the net gravitational force due to these objects on a third uniform sphere with mass 0.510kg placed at the point x= 4.00m, y = 0
an electron and a proton starting from rest are accelerated through an electric potential difference of the same
A 5.0mL syringe has an inner diameter of 4.5mm , a needle inner diameter of 0.29mm, What is the minimum force the nurse needs to apply to the syringe
A spherical water drop 2.6 ?m in diameter is suspended in calm air due to a downward-directed atmospheric electric field of magnitude E = 3800 N/C. How many excess electrons does it have
A solid sphere of radius = 10 cm and mass = 2 kg is going down an inclined plane of height = 5 m. The angle of the inclined plane = 35 degrees. What is the final Total kinetic energy of the sphere
A car traveling at 18 {rm m/s} runs out of gas while traveling up a 24.0^circ slope. How far up the hill will it coast before starting to roll back down.
A 7-Kg bowling ball whose radius is 0.13 m is rolling directly towards you, turning 3 times per second. What is its translational angular momentum about you
Sirius B is a white star that has a surface temperature (in kelvins) that is four times that of our sun. Sirius B radiates only 0.040 times the power radiated by the sun. Our sun has a radius of 6.96 × 108 m. Assuming that Sirius B has the same emiss..
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