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Estimate the number of steps you would have to take to walk a distance equal to the circumference of the Earth. We estimate that the length of a step for an average person is about 18 inches, or roughly 0.5 m. The radius of the Earth is 6.38 x 106 m.
An electron is initially at rest. It is accelerated through a potential difference of 400 V. What is the kinetic energy of this electron
Normal 0 false false false EN-IN X-NONE X-NONE A 40-W heat source is applied ..
The distance between two successive maxima of a transverse wave is 1.20m. Eight crests, or maxima, pass a given point along the direction of travel every 12.0s. Calculate the wave speed.
If 3.00multiplied by10-3kg of gold is deposited on the negative electrode of an electrolytic cell in a period of2.73h, what is the current in the cell during that period
A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 690 m/s. What is the horizontal distance between the end of the rifle and the bull's-eye
A ball is tied to the top of a pole by a string. The ball rotates at 5.0m/s around the pole in a horizontal circle of radius 1.0m. What is the angle between the string and pole
A large group of football fans comes to the game with colored cards that spell out the name of their team when held up simultaneously. Most of the cards are colored blue, find the maximum diameter (in mm) of the spectator's pupils
Ethan, whose mass is 87 kg, stands at one end of a very long, stationary wheeled cart that has a mass of 650 kg. Ethan starts sprinting toward the other end of the cart. He soon reaches his top speed of 8.0 m/s, gauged relative to the cart.
Your normal body temperature is 98.6 F. What kind of radiation do you predominately emit? At what wavelength in nano meters do you emit the most radiation?
a spherical surface completely surrounds a collection of charges. find the electric flux through the surface if the
The equation F = arv + br2v2 gives the magnitude of the resistive force (in newtons) exerted on a sphere of radius r (in meters) by a stream of air moving at speed v (in meters per second), where a and b are constants with appropriate SI units.
An aluminum cylinder is suspended in an unknown fluid by a spring scale. Outside the fluid, the object weighs 20N. In the fluid it weighs 10N. If the cylinder has a volume of 10–4m3, what is the density of the fluid?
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