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A circular coil of wire has a radius of 7.0cm and has 130 turns of wire that carries 6.9 A of current. What is the magnetic field at the center of the coil? Express your answer to two significant figures and include appropriate units.
A railroad car with a mass of 11600 kg collides and couples with a second car of mass 18600 kg that is initially at rest. what is the final velocity of the two railroad cars after they couple
An electron is released to accelerate from point 1 to point 2 in a potential region. The electric potentials at these points are V1 = -35 V and V2 = +200 V. Calculate the change in potential energy of this electron
Particles of charge Q1 = +65 µC, Q2 = +43 µC, and Q3 = -80 µC are placed in a line. The center one, Q2, is 0.35 m from each of the others. find the net force on each charge due to the other two
A tight uniform string with a length of 1.80m is tied down at both ends and placed under a tension of 100N/m. What is the mass of the string
A cubical box 20cm on a side is constructed from 1.5cm -thick concrete panels. What is the air temperature inside the box when the light is on if the surrounding air temperature is 20 ?C
Free neutrons (unlike those in the nucleus of an atom) decay spontaneously into a proton, an electron and an antineutrino. How much energy is released in this decay
Two railroad freight cars with masses 130 (Mg) and 170 (Mg) approach with equal speeds of 0.330 (m/s). What fraction of the original kinetic energy was lost in this inelastic collision
A(n) 0.55 kg softball is pitched at a speed of 11 m/s. The batter hits it back directly at the pitcher at a speed of 28 m/s. The bat acts on the ball for 0.012 s. What is the magnitude of the impulse imparted by the bat to the ball?
if you plot a best-fit line for data on a graph of position vs. time, what units does the lines (vertical) intercept have
The lead female character in the movie Diamonds Are Forever is standing at the edge of an offshore oil rig. Under the same assumption, what would be her recoil velocity if, instead, she shoots a blank cartridge that ejects a mass of 5.0 10-4 kg at ..
In the Bohr theory of the hydrogen atom, an electron moves in acircular orbit about a proton, where the radius of the orbit is.529X10^-10meters. (a), find the electric force between the two.(b) If this force causes the centripetal acceleration of the..
two objects collide and bounce off one another. after the collision object m1 3.10 kg moves off at 8.9 ms at a heading
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