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A tether ball of mass 0.40 kg is attached to a vertical pole by a cord 1.5 m long. Assume the cord attaches to the center of the ball. The cord makes an angle of 20° with the vertical. (a) What is the tension in the cord? . N (b) What is the speed of the ball? . m/s
Two identical capacitors store different amounts of energy: capacitor A stores 2.7 x 10-3 J, Find the voltage across the plates of capacitor A
You are standing at = 9.0 km Lightning bolt 1 at x= 0km and lightning bolt 2 at x = 12.0km. what is the time difference between the two flashes
A 25.0 uf capacitor is charged to a potential difference of 850v . The terminals of the charged capacitor are then connected to those of an uncharged 11.0 uf capacitor. Compute the original charge of the system. Compute the final potential difference..
A 1.5kg block intially at rest at the top of a 3m incline with a slope of 30degrees begins to slide down the incline. How fast is the block moving midway along the inlcine
A loop antenna of area A = 1.87 cm2 and resistance R = 4.06 µO is perpendicular to a uniform magnetic field of magnitude 19.7 µT. How much thermal energy is produced in joules in the loop by the change in field
The place you get your hair cut has two nearly parallel mirrors 7.0 apart. As you sit in the chair, your head is 1.5 from the nearer mirror. How far away does the back of your head appear to be
A circuit consists of a 12.0-V battery connected to three resistors (44ohm , 17ohm and 110ohm ) in series. Find the current that flows through the battery.
A compound microscope has an objective lens with a focal length of 2.0 cm and an eyepiece with a focal length of 5.9 cm. what magnification does this microscope produce
What is kinetic energy of the shell
A 95 long train begins uniform acceleration from rest. The front of the train has a speed of 25 while it passes a railway worker who is standing 170 from where the front of train started. What will be the speed of the last car as it passes the wor..
A submarine is stranded on the bottom of the ocean with its hatch 38 m below the surface. Calculate the force needed to open the hatch from the inside
A solid concrete wall 4.0 m by 2.4 m and 30 cm thick, with a thermal conductivity of 1.3 W/(m?K), How much heat flows through the wall in one hour
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