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A red blood cell typically carries an excess charge of about –2.5×10–12 C distributed uniformly over its surface. The red blood cells can be modelled as spheres approximately 6.6 m in diameter and with a mass of 9.0×10–14 kg. How many surplus electrons does a typical red blood cell have?
two isotopes of carbon carbon-12 and carbon-13 have masses of 19.93 10-27 kg and 21.59 10-27 kg respectively. these two
A flight attendant pulls her 72-N flight bag a distance of 265-m along a level airport floor at a constant velocity. The force she exerts is 44-N at an angle of 57° above the horizontal.
you send a beam of light from a material with index of refraction 1.23 into an unkown material. in order to help
The two blocks (m = 30 kg and M = 100 kg) in the figure below are not attached to each other. The coefficient of static friction between the blocks is µs = 0.49, but the surface beneath the larger block is frictionless.
A 11.9-m-long wire of mass 132g is stretched under a tension of 250N . A pulse is generated at one end, Where will the two pulses first meet
An upright object is placed a distance in front of a converging lens equal to twice the focal length (f1) of the lens. On the other side of the lens is a converging mirror of focal length f2 separated from the lens by a distance 2(f1+f2).
a metal plate of mass (m=20kg) slides down a slope of height (h=10 meters) and angle (theta=30Â °). what is the magnitude of the work done by friction
A 0.750 kg ball falls directly down onto concrete, hitting it with a speed of 12.0 m/s and rebounding directly upward with a speed of 3.00 m/s. What is the impulse on the concrete
An unmarked police car traveling a constant 95 is passed by a speeder traveling 115 . Precisely 1.00 after the speeder passes, how much time passes before the police car overtakes the speeder
An object is placed 19 cm to the left of a converging lens of focal length 25 cm, Find the position and magnification of the final image
A sound source emits sounds of frequency 190 Hz that travel by still air at 340 m/s. The listener moves at 75 m/s relative to still air toward the stationary source. What is the wavelength of the sound between source and listener.
a fire hose ejects a stream of water at an angle of 32.8 degrees above the horizontal. the water leaves the nozzle with
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