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A charged line of linear charge density ? has been bent into a circular arc of radius r that makes an angle ? with its center. (A). Find the magnitude of the electric field at the center of this arc. (Does your result make sense, what should it be if the arc were increased to a full circle? How about if it were shrunk to an angle of 0?) (B). Where would a point charge of the same total charge as the arc need to be placed in order to make the electric field at the center of the arc equal to zero? (Hint: X and Y axes have not been chosen for you, you will have to choose your own. If you consider symmetry, you can choose them so that the electric field at the center only points in either the X or Y direction. Make sure to include a diagram showing your choice. More Hints: How does the magnitude of the electric field contributed by each little segment of arc compare to the contributions from the other segments? Do we just straight up add these magnitudes?)
Heat is extracted from a certain quantity of steam at 100 degrees celsius. Thus the steam changes into ice at 0 degrees celsius. If this energy were used to accelerate the ice from rest, what would be the linear speed of the ice.
A flywheel in a motor is spinning at 560 when a power failure suddenly occurs. The flywheel has mass 40.0 and diameter 75.0. The power is off for 34.0, and during this time the flywheel slows down uniformly due to friction in its axle bearings. Durin..
New physics student having trouble with hw, not sure how to set this up or find the answer. Throw a ball straight up with an initial vel. of 18.5m/s. if ball is caught at the same height it was released, and then compute the max. Height achieved b..
A horse canters away from its trainer in a straight line, moving 111 m away in 15.0 s. It then turns abruptly and gallops halfway back in 4.90 s.
Find the work done by this force on the particle and the final speed of the particle as it moves along a path.
If light enters the window from outside at 23.0° to the normal, at what angle to normal does it exit the window on the inside.
What temperature change would reason a 0.20 % enhance in the volume of a quantity of water that was at first at 20 ^circ {rm C}.
Two examples of chemotherapeutic drugs (drugs used to treat cancer) and their cellular actions are listed below. Describe why each drug could be fatal to a cell.
A car is traveling 17 m/s when the driver sees a child standing on the road. He takes 0.8 s to react, then steps on the brakes and slows at 7.5 m/s2. How far does the car go before it stops.
A block rests on the frictionless horizontal surface and is attached to a spring. While set into simple harmonic motion, block oscillates back and forth with an angular frequency of 6.5 rad/s.
A 48 kg skier starts from rest at a height of H = 27 m above the end of the ski-jump ramp. As the skier leaves the ramp, his velocity makes an angle of 28° with the horizontal. avoid the effects of air resistance and assume the ramp is frictionles..
A 0.200-kg block along a horizontal track has a speed of 1.80m/s at once before colliding with a light spring of force constant 44.2 N/m located at the end of the track.
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