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An archer fish spies a meal of a grasshopper sitting on a long stalk of grass at the edge of the pond in which he is swimming. If the fish is to successfully spit at and strike the grasshopper, which is 0.200 m away horizontally and 0.525 m above his mouth, what is the minimum speed at which the archer fish must spit? What angle above the horizontal must he spit?
Two objects with masses 5.20kg and 1.60kg hang 0.800m above the floor from the ends of a cord 5.00m long passing over a frictionless pulley. Find the maximum height reached by the 1.60kg object
A solenoid is 2.0 m long and with an inner radius of 30 cm and 1000 turns of wire. How large does the current does it carry
A rock is suspended from a scale reads 20.0 N. A beaker of water ( having a density of 1000 kg/m^3) is raised up so the rock is totally submerged in the water. The scale now reads 12.5 N. What is the density of the rock?
A foul ball is hit straight up into the air with a speed of about 25 m/s. How long is it in the air
A flea jumps by exerting a force of 1.32x10-5 N straight down on the ground. Find the direction and magnitude of acceleration of the flea
Why does the base of a shuttle cock always lead in motion when hit with a racket. what is grocery carts final speed.
A flat observation screen is placed at a distance of 4.5 m from a pair of slits. The separation on the screen between the central bright fringe and the first-order bright fringe is 0.043 m. Determine the slit separation
q1. when two tuning forks of 128 hz and 149 hz respectively are sounded simultaneously how various beats per second are
When three point charges +4.0 μC, -5.0 μC, and -9.0 μC are placed on the x-axis at the points x. What is the x component of the electrostatic force on the -9.0 μC charge due to the other two charges?
The lens of a slide projector with a focal length of 100.0 mm projects a slide onto a screen that is 10.0 m away. How far from the lens must the slide be placed to form a sharp image on the screen?(in cm)
Two point charges are placed along a horizontal axis with the following values and positions: +2 µC at x = 0 cm and - 21 µC at x = 21 cm. At what point (the coordinate) along the x axis is the electric field zero? Expess the answer (in cm) with one d..
when we charge any capacitor by applying a battery to a certain voltage, how the energy decreases and why
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