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An interesting (but oversimplified) model of an atom pictures an electron "in orbit" around a proton. Suppose this electron is moving in a circular orbit of radius 0.5 nm and the force that makes this circular motion possible is the electric force exerted by the proton on the electron. Find the speed of the electron.
a parallel-plate capacitor has plates with an area of 1.3times10-2m2 and a separation of 0.83mm. the space between the
Water is moving with a speed of 24.8 m/s through a pipe with a cross-sectional area of 3.0 cm2. What is the speed of flow at the lower level
What is the total force (magnitude and direction) exerted by these two charges on a third charge q3=+5.00 nC located at y=-0.4000m
A 80g , 39-cm-long rod hangs vertically on a frictionless, horizontal axle passing through its center. A 14g ball of clay traveling horizontally at 2.3m/s hits and sticks to the very bottom tip of the rod.
A 130- baseball, moving along the axis with speed 35 , strikes a fence at a 45 angle and rebounds along axis with unchanged speed Give the - and - components of its change in momentum.
you measure wavelength divided by 2 to be 70cm. The temperature in the lab is 22 degrees celsius. What is the frequency of the resonance
The diffusion constant for the alcohol ethanol in water is 1.24 10-9 m2/s. A cylinder has a cross-sectional area of 3.85 cm2 and a length of 1.82 cm. what mass of ethanol diffuses through the cylinder
A 66 trampoline artist jumps vertcally upward from the top of a platform with a speed of 5.4 . A) What is his speed as he lands on the trampoline, 3 m below his jump off point? B) If the trampoline behaves like a spring with spring stiffness constant..
A 22.5-mW laser beam of diameter 1.98 mm is reflected at normal incidence by a perfectly reflecting mirror. Calculate the radiation pressure on the mirror
A uniform ladder of length L and mass m leans against a frictionless vertical wall, making an angle of 48° with the horizontal. how high can you climb before the ladder begins to slip
how much time in seconds will it take the officer. A 63 resistor is connected in parallel with a 115.0 resistor. This parallel group is connected in series with a 19 resistor. The total combination is connected across a 15.0 V battery. Find the cur..
An 83.0kg student, starting from rest, slides down a 11.8m highwater slide. How fast is he going at the bottom of the slide
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