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An antenna sends out electromagnetic waves in a spherically symetric pattern around it with a power P=20W.a What is the intensity of the radiation a distance d=100m away?
Mario is watching Luigi fly past in a spaceship at 1.63×108 m/s. How long does an hour on the ship last, according to Luigi
Two equal size boxes, A and B, contain ideal gases. An inserted thermometer shows TA= 50°C and TB= 10°C. This is all we know about the gas in the boxes. Which of the following statements must be true? Could be true? Must be false? Explain your rea..
A force in the negative direction of an x axis is applied for 24 ms to a 0.40 kg ball initially moving at 10 m/s in the positive direction of the axis. What is the ball's speed just after the force is applied
A boy whirls a stone in a horizontal circle of radius 1.3 m and at height 1.6 m above level ground. What is the magnitude of the centripetal acceleration
Does the strength of the attraction or repulsion vary with distance? Can you see Newton's Third Law in action with strips of Scotch tape? Be very specific in describing how you see the 3rd law manifested. Can you see it if you bring a charged plas..
At a time when mining asteroids has become feasible, astronauts have connected a line between their 3310-kg space tug, How much time does it take for the ship and the asteroid to meet
Two electrons are located at two of the vertices of an equilateral triangle, one at each vertex. What is the net electric field at the third vertex
Bill is farsighted and has a near point located 110 cm from his eyes. what is the closest object that can be seen clearly by Anne when she wears Bill's glasses
Both surfaces of a double convex lens have radii of 30.8 cm. what is the index of refraction of the lens material
question a sodium-vapor lamp has power output of 10.0 w. using 589.3 nm as the average wavelength of this source
The angular speed can be represented as ? = (rad/s)(1 rev/2p rad) = 2.53e7 rev/s. The electrons travel around a circle of radius .07m, 25 million times per second. What is the period of revolution of the electrons
A massless, rigid board is placed across two bathroom scales that are separated by a distance of 2.06 m. Locate the center of gravity of the person relative to the scale beneath his head
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