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Several bacteria are propelled by motors that spin hair-like flagella. A characteristic bacterial motor turning at a constant angular velocity has a radius of 1.9x10-8m, and a tangential speed at the rim of 2.9x10-5 m/s. (a) What is the angular speed (the magnitude of the angular velocity) of this bacterial motor? (b) How long does it take the motor to create one revolution?
an elevator is moving upward at a constant speed of 2.50 ms. a bolt in the elevator ceiling 3.00 m above the elevator
A tennis player hits a 1.45 kg tennis ball with a racket of mass 2.5 kg. what impulse did he imply on the ball
a charge of 8.00 mc is placed at each corner of a square 1.20 m on a side. determine the magnitude and direction of the
the intensity of electromagnetic radiation from the sun reaching the earths upper atmosphere is 1.37 kwm2assuming an
Light of wavelength 800nm is incident on a metallic surface. if the stopping potential for the photo-electrons ejected from the metal is 0.35 volts, find the work function for the metal and the longest wavelength incident light that will eject photo-..
a 25.8 g block of copper whose temperature is 406 k is placed in an insulating box with a 53.4 g block of lead whose
A 253 kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 30.0° with respect to the horizontal.
You throw a ball from the top of a 50 m high building at 12 m/s upward. The ball misses the building on the way down. The mass of the ball is 2 kg. What is the total work done by the force of gravity on the ball
Suppose a tank contains 770 m3 of neon (Ne) at an absolute pressure of 1.01×105 Pa. The temperature is changed from 293.2 to 295.6 K. What is the increase in the internal energy of the neon?
Together, two students exert a force of 825N in pushing a car a distance of 35 m. How much work do the students do on the car
Two students on roller skates stand face-to-face, then push each other away. One student has a mass of 99 kg and the second student 68 kg. Find the ratio of the magnitude of the first student's velocity to the magnitude of the second student's velo..
A lens maker makes a lens with a material whose index of refraction is 1.44. Estimate the refractive power of the lens
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