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A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.76 m. With the string hanging vertically, the object is given an initial velocity of 2.8 m/s parallel to the ground and swings upward in a circular arc. Eventually, the object comes to a momentary halt at a point where the string makes an angle ? with its initial vertical orientation and then swings back downward. Find the angle ?.
An electron with a speed of 3.6105m/s enters a uniform magnetic field of magnitude0.057T at an angle of 35° to the magnetic field lines. The electron will follow a helical path.
At every point on the surface of a sphere of radius 0.4 m the electric field is radially outward, with a magnitude of 20 N/C
Three people pull simultaneously on a stubborn donkey. Jack pulls directly ahead of the donkey with a force of 81.7 N, Find the magnitude of the net force the people exert on the donkey
The speed of a light wave in a certain transparent material is 0.501 times its speed in vacuum, what is its wavelength in nanometers
how much work is done by the electric field as a third charge q3 = +2.19 nC is moved from point a to point b. (q1 = +9.41 nC, q2 = -9.41 nC)
a reseacher wishes to estimate with 95 confidence the percentage of adults who support abolsihing the penny. his
Two power supplies are connected in series. The maximum voltage of each power supply is8.3V and 15.0V respectively, what is the resulting maximum voltage produced by the supplies
The winning time for the 2005 annual race up 86 floors of the Empire State Building was 10 min and 49 s. What was the winner's metabolic power in watts during the race up the stairs
Two resistors of resistance R are connected in parallel. The combination is connected in series to a resistor of resistance 2R. What is the resistance of this combination of resistors
A copper rod hangs vertically from a fixed support. The rod is 1.55 m long and 1.55 mm in diameter. how far does the rod stretch
q1. a 10.4-kg cylinder rolls without slipping on a rough surface. at an instant while its center of gravity has a speed
The position of a particle moving along the x axis depends on the time according to x=ct^2-bt^3 where x is in meters, what distance does the particle move and what is its displacement
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