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A gamma ray disappears in the process of creating an electron-positron pair. If the kinetic energies of the electron and positron are each 2.0 MeV, what was the energy of the gamma ray?
Bernie B is walking directly toward the center of a vertical mirror M. How close to the mirror will he be when Sarah S is just able to see him The vertical mirror has a width d = 3.0 m.
A dolphin in seawater at a temperature of 25 °C emits a sound wave directed toward the ocean floor 246 m below. How much time passes before it hears an echo? (The speed of sound in ocean water is 1533 m/s.)
Let the building is 50 m tall, the initial horizontal velocity is 9.0 m/s, and the initial vertical velocity is 12.0 m/s. select your coordinates such that the positive y-axis is upward, and the x-axis is to the right, and the origin is at the poi..
A magnetic field has a magnitude of 0.0014 T, and an electric field has a magnitude of 4.2 × 103 N/C. compute the magnitude of the net force that acts on the charge
When the three blocks in the figure below are released from rest, they accelerate with a magnitude of 0.740 m/s2, What is the coefficient of kinetic friction between block 2 and the table
In this problem you will consider the balance of thermal energy radiated and absorbed by a person. Find the net power radiated by the person when in a room with temperature . Express the net radiated power numerically, to the nearest 10 W
The capacitors are identical except that C2 has a dielectric inserted between its plates. A 210 V battery is connected across the combination until electrostatic equilibrium is established, and then the battery is disconnected.
A thin 11-cm-long solenoid has a total of 440 turns of wire and carries a current of 1.9A, Calculate the field inside the solenoid near the center
A ball falls straight down onto a wedge that is sitting on frictionless ice. The ball has a mass of 3.21 kg, what is the velocity of the ball after the collision
A spherical balloon has a radius of12.5m, and is filled with helium. How large a cargo can it lift, assuming that the skin and structure of the balloon have a mass of600kg
q1. illustrate how the device equipped with an ultrasonic speaker a microphone and a precision timer might be used to
A van with a mass m(v) moves along a frictionless road at v0 m/s when some heavy luggage is added to the top that weighs m(l) onto the roof
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