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A speeder is pulling directly away and increasing his distance from a police car that is moving at 25.1m/s with respect to the ground. The radar gun in the police car emitsan electromagnetic wave with a frequency of 7.16E+9 Hz. The wave reflects from the speeder's car and returns to the police car,where its frequency is measured to be 322 Hz less than the emitted frequency. Calculate the speeder's speed with respect to the ground.
At t = 0, a particle leaves the origin with the velocity of 9 m/ s in the positively direction and moves in the x y plane with a constant acceleration of (2.0i - 4.0j) m/ s2. At the instant the x coordinate of the particle is 15m, what is the spee..
Two waves traveling in opposite directions along a string fixed at both ends create a standing wave described by y(x, t) = 0.01 sin(44x)cos(1090t). The string has a linear mass density of 0.01 kg/m, and the tension in the string is supplied by a m..
A solar cell generates a potential difference of 0.0984 V when a 500 ? resistor is connected across it, What is the internal resistance of the solar cell
When two identical ions are separated by a distance of 8.3×10?10m , the electrostatic force each exerts on the other is 5.4×10?9N How many electrons are missing from each ion
a hockey puck of mass m and radius r slides across frictionless ice. it has translational speed v to the right and
An ideal refrigerator utilizes a Carnot cycle operating between 0 degrees Celcius and 18 degrees Celcius. How much energy must be supplied to the refrigerator
A 100-W lightbulb has a resistance of about 12Ω when cold (12 C) and 140Ω when on (hot). Estimate the temperature of the filament when hot assuming an average temperature when hot assuming an average temperature coefficient of resistivity a =0.0060 ..
two stationary positive point charges charge 1 of magnitude 3.80nc and charge 2 of magnitude 1.70nc are separated by a
During a baseball game, a batter approaches the plate. The pitcher hurtles the ball in the direction of the batter at a speed of 85 miles per hour. find the momentum of the system in the center of mass frame
an 8000 kg truck traveling with a velocity of 20.0m/s in a direction 30 (degree) south of east, find the direction of the combined mass
A small plastic sphere with a charge of - 5.0 nC is near another small plastic sphere with a charge of - 12 nC. what is the distance between the sphere
A parallel plate capacitor of capacitance 7.6 µF has the space between the plates filled with a slab of glass with ? = 3.2. Find the charge on the plates after the glass is removed
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