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At a distance of 10 Km, a 100 Hz horn, assumed to be anisotropic point source, is barely audible. At what distance wouldit begin to cause pain?
A uniform electric field of magnitude 640 N/C exists between two parallel plates that are 4.00 cm apart. Calculate the distance from the positive plate
A block of iron is suspended from one end of an equal-arm balance by a thin wire. To balance the scales, 8.05 kg are needed on the scale pan at the other end. What is the volume of the block
the velocity of an airplane is 50km/hr due north. the plane the plane flies into a cross wind of 50km/hr due east at a right angle
Calculate the temperature at which a tungsten filament that has an emissivity of 0.50 and a surface area of 3.9 10-5 m2 will radiate energy at the rate of 35 W in a room
A certain type of laser emits light that has a frequency of 6.0 × 1014 Hz. How many wavelengths are there in one pulse
What least horsepower must a motor have to be able to drag a 320 box along a level floor at a speed of 1.10 if the coefficient of friction is 0.50.
When a 47.0-V emf device is placed across two resistors in series, a current of 4.0 A is flowing in each of the resistors. obtain the magnitude of the larger of the two resistances
There are some people who believe that Earth has a twin that orbits directly opposite the sun with exactly the same orbital elements and in the saem direction and thus unseen from Earth. The two planets are exactly 180 degrees opposed when they oc..
What is the total force on an object if 47.2 pounds upward, and 59.3 lb to the right are acting on it? answer sketching the diagram and show mathematical calculation.
What is the change in gravitational potential energy of a 2.00- kg mass that is carried from the surface of the earth to a distance of one earth radius above the surface
question1a person eats a dessert that contains 210 calories. this calorie unit with a capital c is the one used by
A 60 kg boy and a 40 kg girl both wearing skates face eachother at rest on a frictionless ice surface. what is the resulting speed and direction of the boy
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