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A blue ball is thrown upward with an initial speed of 19.6 m/s, from a height of 0.7 meters above the ground. 2.4 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 10.0 m/s from a height of 21.7 meters above the ground. The force of gravity due to the earth results in the balls each having a constant downward acceleration of 9.81 m/s2 How long after the blue ball is thrown are the two balls in the air at the same height?
A dolphin located in sea water at a temperature of 25°C emits a sound directed toward the bottom of the ocean 160 m below. How much time passes before it hears an echo
An electromagnet used to lift a car at a junkyard needs to generate a magnetic field strength of about one tesla. The magnet consists of a cylindrical iron core 1 m in diameter and 10 cm high wrapped with 100 turns of wire. Assuming the permeability ..
Runner A is initially 1.0 mi west of a flagpole and is running with a constant velocity of 8.0 mi/h due east. How far are the runners from the flagpole when they meet
q1. what are sunspots and how are they related to suns magnetic field? is a magnetic field stronger weaker in sunspots?
A 20 wood ball hangs from a 1-long wire. The highest tension the wire can withstand without breaking is 600. A 0.90 projectile travelling horizontally hits and embeds itself in the wood ball. What is the largest speed this projectile can have with..
A 67.5 kg circus performer slides4.10 m down a pole to the circusfloor, starting from rest. What is the kinetic energy of the performer as shereaches the floor
A telescope can be used as a camera if the film is placed at the image position of the objective lens, what is the angular separation of the two stars
A circular wire loop, with a single turn, has a radius of 14.0 cm. The loop is in a magnetic field that is decreasing at the rate of 0.500 T/s. determine the magnitude of the emf induced in the loop
A very fast-moving train car passes you, moving to the right at 0.50c. You measure its length to be 12m. How long does David measure the train car to be
a current sensitive circuit in a portable dvd player consists of an dc power source and a lightbulb that is used as a
Agent Arlene devised the following method of measuring the muzzle velocity of a rifle. She fires a bullet into a 4.600-kg wooden block resting on a smooth surface, What is the speed v of the bullet
An electron has an initial velocity of 3.50 106 m/s in the x direction. It enters a uniform electric field = (400 N/C) , which is in the y direction. (a) Find the acceleration of the electron.
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