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A spectator, seated in the left field stands, is watching a baseball player who is 1.88 m tall and is 82 m away. On a TV screen, located 3.7 m from a person watching the game at home, the image of this same player is 0.14 m tall.
Find the angular size of the player as seen by
(a) the spectator watching the game live and
(b) the TV viewer.
(c) To whom does the player appear to be larger?
An n-type semiconductor has a donor concentration of 1*10^13 cm^-3. If the equilibrium electron concentration is 1.2*10^13 cm^-3
A uniform plank of length 5.5 m and weight 205 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support .To what distance x can a person who weighs 447-N walk on the overhanging part of the plank before it just ..
A molecule of DNA (deoxyribonucleic acid) is 2.26 µm long. The ends of the molecule become singly ionized: Determine the effective spring constant of the molecule
A 3 μF capacitor is connected in series with a 22 kΩ resistor. Find the voltage between the plates of the capacitor 18 ms after closing the switch
a 11micro f capacitor is joined in series with a 35micro f capacitor and a 12 volts battery.a what is the potential
A 66kg rock climber is climbing a so called chimney between two rock slabs, What is her push against the rock
a banner is suspended from a horizontal pivoted pole. the pole is 2.10 m long and weighs 170 n. the banner which weighs
The helium-neon lasers most commonly used in student physics laboratories have average power outputs of 0.250 mW, Find the peak electric field strength
A 47 N block rests on a horizontal surface. The coefficients of static and kinetic friction between the surface and the block are 0.9 and 0.5, respectively. What is the force of friction acting on the block
Consider a spider walking from the top of a (stationary) beach ball. (Let that angular position = 0O.), At what angle does this slipping begin
What is the difference in blood pressure ({rm mm-Hg}) between the top of the head and bottom of the feet of a 1.80-{rm m}-tall person standing vertically.
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
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