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Light is shining perpendicularly on the surface of the earth with an intensity of 680 W/m2. Assuming that all the photons in the light have the same wavelength (in vacuum) of 526 nm, determine the number of photons per second per square meter that reach the earth.
At NASA's Zero Gravity Research Facility in Cleveland, Ohio, experimental payloads fall freely from rest in an evacuated vertical shaft through a distance of 132 m. How fast will the payload be traveling when it reaches the bottom of the shaft
a analyse a technological device that applies the principles of linear or circular motion. b assess the impact on
a rod (length 3 meters, mass 1 kg) is pinned at its end so the stick can rotate freely in a plane parallel to a tabletop. Where along the rod is the force applied
When a current flows in an aluminum wire of diameter 2.45 mm, the drift speed of the conduction electrons is 1.05 × 10-4 m/s. What is the electron current in the wire
A 20 x microscope objective is designed for use in a microscope with a 17 cm tube length. The objective is marked NA = 0.45. What is the diameter of the objective lens
An electron is accelerated from rest by a potential difference of 440 V. It then enters a uniform magnetic field of magnitude 220 mT with its velocity perpendicular to the field. Calculate the radius of its path in the magnetic field
A 79.2 kg airplane pilot pulls out of a dive by following, at a constant speed of 191 km/h, the arc of a circle whose radius is 321m.
A convex mirror with a focal length of 0.25 m forms a 0.081 m tall image of an automobile at a distance of 0.23 m behind the mirror
Consider two identical +53 microcoulomb point charges placed 58 cm apart. Calculate the work (in J) required to move the test charge to a point 8 cm closer to either of the charges
An electron with mass 9.11×10-31 kg moves with a speed of 2.10×106 m/s in a circle of 2.94 cm radius under the influence of a magnetic field. What is the radius of the proton's orbit
A 79 kg person sits on a 3.7 kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.3 cm in diameter. Find out the pressure exerted on the floor by each leg of the chair, suppose the weight is evenly distributed.
Estimate the rms electric field in the sunlight that hits Saturn, knowing that the Earth receives about 1350 W/m2
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