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An electric-dipole antenna is located on the roof of a 213-m-high building and is oriented vertically. An observer on the ground measures the intensity of the radiation from the antenna and finds 8.49 mW/m2. This observer is 1.03 km away from the antenna. A second observer hovers in a blimp at an altitude of 561 m and measures the radiation intensity from the antenna when she is 1.37 km from the antenna. What intensity, in milliwatts per square meter, does she measure?
A person who weighs 684 N steps onto a spring scale in bathroom, and the spring compresses by 0.518 cm. (a) What is the spring constant? (b) What is the weight of another person who compresses spring by 0.328 cm.
A grandfather clock is controlled by a swinging brass pendulum that is1.2m long at a temperature of28°C. What is the length of the pendulum rod
A toroidal inductor with an inductance of 87.0 mH encloses a volume of 0.0200 m3. what is the current through the inductor
A 6-lb block is attached to a cable and to a spring. theconstant of the spring is k=5lb/in and the tension in the cable is4 lb. determine the maximum displacement of the block
A 108 gcube of ice at 0°C is dropped into 1.0 kg of water that wasoriginally at 72°C. What is the final temperature of the water after the ice has melted
In a football game, a receiver is standing still, having justcaught a pass. Before he can move, a tackler, running at a velocityof +3.77 m/s, grabs him. The tackler holds onto the receiver, andthe two move off together with a velocity of +1.64 m/s. T..
Consider a 80.0-kg man standing on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.46 m/s in 0.550 s. It travels with this constant speed for the next 5.00 s. The elevator then undergoes a ..
A magician wishes to create the illusion of a 2.17-m-tall elephant. He plans to do this by forming a virtual image of a 57.0 cm tall model elephant with the help of a spherical mirror. what radius of curvature is needed
Two astronauts on opposite ends of a space ship are comparing lunches. One has an apple, the other has an orange. What is the final speed and direction of the apple in this case
An irrigator uses the (old-fashioned) concept of plant available water to determine the irrigation water quantity needed to irrigate a 10 ha field, How much water does the irrigator need to apply
A nozzle of inner radius 1.05 mm is connected to a hose of inner radius 7.95 mm. The nozzle shoots out water moving at 25.5 m/s. At what speed is the water in the hose moving
A block is connected between two springs on a frictionless, horizontally level track. what is the mass of the block
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