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When an object falls freely under the influence of gravity there is a net force mg exerted on it by the Earth. Yet by newtons third law the object exerts an equal and opposite force on the Earth. Why doesnt the Eath move?
A typical half life calculated from the simplest such theory, the SU(5) model, is about 10^32 years. How many protons are in all the oceans on earth
If a beam is incident normal (perpendicular to the surface) to a plane mirror, what is the angle of reflections
A red laser emits photons by a wavelength of 635 nm. If this laser has a power of 23 W, how many photons does it emit in 1 s? If the light emitted by the laser is absorbed with a black sail, what is the force on the sail?
The speed of light is 3 x 10^8 m/s. The sun is 93 million miles from earth. How many minutes does light take to reach the earth
once upon a time a stunt man named evil knievel boasted that he would jump across the grand canyon on a motorcycle.
Two polarizers are oriented at 54? to one another. Unpolarized light falls on them. What fraction of the light is intensity is transmitted
q. a pump submerged at the bottom of a well that is 35m deep is used to pump water uphill to a house that is 50m above
A square, single-turn coil 0.25 m on aside is placed with its plane perpendicular to a constant magneticfield. An emf of 18 mV is induced inthe winding when the area of the coil decreases at a rate of0.08 m2/s.
A grinding wheel in the shape of a solid disk is 0.300m in diameter and has a mass of 2.50kg . The wheel is rotating at 2100rpm about an axis through its center. A) What is its kinetic energy? B) How far would it have to drop in free fall to acquire ..
A 9.60 kg object oscillates at the end of a vertical spring that has a spring constant of 1.65*10^4 N/m. By what percentage does the amplitude of the oscillation decrease
An object is located 75.0 cm in front of a mirror and on the principle axis. The mirror is concave with a radius of curvature 50.0 cm. State the properties of the image
The magnitude of the dipole moment associated with an atom ofiron in an iron bar is 2.1 10-23J/T. What is the dipole moment of the bar
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