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A small mirror is attached to a vertical wall, and it hangs adistance of 1.59 m above the floor. The mirror is facing dueeast, and a ray of sunlight strikes the mirror early in the morningand then again later in the morning. The incident andreflected rays lie in a plane that is perpendicular to both thewall and the floor. Early in the morning, the refleted raystrikes the floor at a distance of 3.95 m from the base of thewall. Later on in the morning the ray is observed to strike the floor at a distance of 1.39 m from the wall. The earth rotates at a rate of 15.0o per hour. How much time(in hours) has elapsed between the two observations?
While looking into a silver Christmas ornament, If your nose is only 6.25 inches from the ornament, and the diameter of the ornament is 4.85 cm, how far behind the ornament does your nose appear
q1. a chair of weight 74.0 n lies atop a horizontal floor the floor is not frictionless. you push on the chair with a
the half life of thorium 227 is 18.72 days. it decays by alpha emission to radium 223 an alpha emitter whose half life
A 0.20 kg block rests on a frictionless level surface and is attached to a horizontally aligned spring with a spring constant of 40 N/m. The block is initially displaced 4 cm from the equilibrium point and then released to set up a simple harmonic mo..
A container with a pressure of 3 atmospheres and a temperature of 200c contains 36 gram of nitrogen. what is the mean distance between molecules, assuming that the container is a cube
A Big Mac has 3,100,000 Joules of chemical energy, what is the cost of the electric energy equivalent to the energy in a Big Mac
A person wearing the shoes has a mass of 65kg. Estimate the pressure exerted on a floor by one wide heel of area 16 cm2
Pulsed lasers used in science and medicine produce very short bursts of electromagnetic energy. If the laser light wavelength is 1062 nm, How many wavelengths are found within the laser pulse
In a certain region, the earth's magnetic field has a magnitude of 5.4 × 10-5 T and is directed north at an angle of 49° below the horizontal. Determine the bullet's electric charge
consider two observers jane and susan both in the vacuum region surrounding a 15 compact spherical object of
the 20 g centrifuge at nasas ames research center in mountain view california is a horizontal cylindrical tube 58 ft
A cord is used to vertically lower an initially stationary block of mass M = 30 kg at a constant downward acceleration of g/5. Find the kinetic energy of the block
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