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When we look at a particular star, we are seeing it as it was 103 years ago. How far away from us (in meters) is the star? Take a year to be 365.25 days.
A circular solenoid contains 100.0 turns of wire and carries a current of 2.0 amps. Calculate the magnetic flux through one turn of the wire
An athlete at the gym holds a 1.8-kg steel ball in his hand. His arm is 74-cm long and has a mass of 4.00 kg. What is the magnitude of the torque about his muster if he holds his arm straight out, parallel to the floor.
Two charges, q1 = -80 nC and q2 = +50 nC are placed 3 m apart as shown. The (x,y) coordinates of the charges and two other points in meters are indicated. Find out the electric potential at points A and B
The power of a certain CD player operating at 120V rms is 20.5W. determine the maximum instantaneous power
An electron and a anti-electron (Positron) circle eachother at a distance of 1.00x10^-19m. What is the electrostatic force between the particles? What is the potential energy of the system? Is this energy positive or negative?
The highest-energy cosmic ray ever detected had an energy of about 3.0x10^20 eV. Assume that this cosmic ray was a proton. What was the proton's speed as a fraction of c
the distance between the slits in the two-slit experiment is 1.50 x 10^ -5 m. What is the distance on the screen between the central bright fringe and the 4th order bright fringe
A rifle with a barrel length of 59 cm fires a 8 g bullet with a horizontal speed of 350 m/s, What resistive force (assumed to be constant) does the wood exert on the bullet
A current-carrying wire passes through a region of space that has a uniform magnetic field of 0.76 T. determine the minimum current needed to levitate the wire
In Denver, children bring their old jack-o-lanterns to the top of a tower and compete for accuracy in hitting a target on the ground, what is the launch speed needed to hit the bulls-eye
three forces are applied to a bracket as shown. determine the range of values of alpha for which the magnitude of the resultant forces acting on a is less than 600n
a worker drags a 310 kg crate at a constant velocity of 3 m/s, across a factory floor by pulling on a rope tied to the crate. What is the acceleration of the crate
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