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An electric-dipole antenna, broadcasting microwave electromagnetic radiation for mobile communications, is located on the roof of a 113-m-high building and is oriented vertically. Two observers measure the signal strength (radiation intensity) from this antenna. Observer A is on the roof of another building, at the same height as the antenna and at a distance of 1.77 km from it. Observer B is on the street, with a direct-line distance of only 169 m from the antenna. What is the ratio of the signal strength measured by B, IB, to that measured by A, IA?
A 100 g (mass) bouncy ball has a downward velocity of 10 m/s right before hitting the ground. How long was the ball in contact with the ground to the nearest second
A car is driven east for a distance of 48km, then north for 32 km, and then in adirection 31°east of north for 25 km. Draw the vectordiagram and determine the total displacement of the car from itsstarting point.
A jeweller’s lens of focal length 1.7 cm is utilized as a magnifier. With the lens held near the eye, decide the following. What is the object distance giving the maximum magnification? What is the angular magnification when the object is at the foca..
the uniform electric field between the two plates of a capacitor is 120 n and the potential difference between plates
A spring has a force constant of 20,000 N/m. Compute how far must it be stretched for its potential energy to be 36 Joule
Calculate the torque required to accelerate the Earth in3days from rest to its present angular speed about its axis. Calculate the average power required
A uniform ladder of mass (m) and length (L) leans against a frictionless wall. If the coefficient of static friction between the ladder and the ground is 0.51, what is the minimum angle (theta) between the ladder and the floor at which the ladder wil..
When a fish looks up at an angle of 45 degrees with the horizon, does it see the sky or the reflection of the bottom beneath? Explain why.
A golf ball, hit from the tee, travel 325 m in a direction 25 degrees south of the east axis. What are the east and north components of its displacement?
A listener increases his distance from a sound source by a factor of 3.03. what is the change in the sound intensity level in dB
A particle with charge +7.20 nC is in a uniform electric field directed to the left. What is the magnitude of the electric field
a frictionless pulley in the shape of a solid cylinder of mass m3kg and radius r0.4 is used to draw water from a well.
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