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A speeder is pulling directly away and increasing his distance from a police car that is moving at 23 m/s with respect to the ground. The radar gun in the police car emits an electromagnetic wave with a frequency of 7.00 109 Hz. The wave reflects from the speeder's car and returns to the police car, where its frequency is measured to be 316 Hz less than the emitted frequency. Find the speeder's speed with respect to the ground.
Two masses are connected by a light string that goes over a light, frictionless pulley. determine the maximum height attained by the 2.1-kg mass
In the x-y plane, a charge of -4.6 microcoulombs is on the x-axis at the point (-30cm,0cm), calculate the magnitude and direction of the resultant electric field E at the origin (0cm,0cm)
Water falls without splashing at the rate of 0.210 L/s from a height of 3.90m into a 0.590 kg bucket on a scale. If the bucket is originally empty, what does the scale read 4.00 s after water starts to accumulate in it.
A circuit consists of two 475-k%u03A9 resistors in series with an ideal 12.0-V battery. Calculate the potential drop across one of the resistors
Estimate the magnitude of the electric field strength due to a proton in a hydrogen atom at a distance of 5.29E-11 m, the expected position of the electron in the atom
What are the two main mechanisms that the planet Earth uses to balance water that goes up with the water that comes down over Earth.
A dentist's drill starts from rest. After 2.70 s of constant angular acceleration it turns at a rate of 2.4 104 rev/min. Find the drills angular acceleration
The drawing shows four insulated wires overlapping one another, forming a square with 0.050-m sides, Calculate the current I.
A person whose near-point distance is 52cm wears a pair of glasses that are 2.2cm from her eyes. Find the refractive power of her glasses
A heat pump has a coefficient of performance of 3.90, How much energy does it deliver into a home during 12 h of continuous operation
a car of 1200 kg travels east (call it +x) at 24 m/s while a truck of 2200kg travels north (call it +y) at 19 m/s . they collide and stick together. What is the momentum in the sysem
Natural gold has only one isotope: If gold is bombarded with slow neutrons, particles are emitted. (a) Write the appropriate reaction equation. (b) Calculate the maximum energy of the emitted beta particles.
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