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Suppose you design an apparatus in which a uniformly charged disk of radius R is to produce an electric field. The field magnitude is most important along the central perpendicular axis of the disk, at a point P at distance 2.90R from the disk (Fig. a). Cost analysis suggests that you switch to a ring of the same outer radius R but with inner radius R/2.00 (Fig. b). Assume that the ring will have the same surface charge density as the original disk. If you switch to the ring, by what percentage will you decrease the electric field magnitude at P?
One mole of an ideal diatomic gas is heated from a temperature of 22 degrees C to a temperature of 95 degrees C. How much heat in joules must be supplied if the volume is kept constant during heating?
An overhead projector has a convergent lens of focal length 35.0 cm. It projects the image of transparency on a wall 4.00 meters from the lens. how wide is the image on the screen
An athlete competing in long jump leaves the ground with a speed of 9.14 m/s at an angle of 35.0 ° above the horizontal
An air puck of mass m1 = 0.15 kg is tied to a string and allowed to revolve in a circle of radius R = 1.1 m on a frictionless horizontal table. What is the horizontal force acting on the puck
A 60-kg skier starts from rest from the top of a 50-m high slope. If the work done by friction is -6.0 15) x 103 J, what is the speed of the skier
An electric motor contains a 250-turn circular coil 5.8cm in diameter. If it is to develop a maximum torque of 1.6Nm at a current of 4.0 A, what should be the magnetic field strength
A 33.7-m length of copper wire at 20.0°C has a radius of 0.23 mm. If a potential difference of 7.0 V is applied across the length of the wire, determine the current in the wire
A car manufacturer claims that you can drive their new vehicle across a hill with a 47 slope before the vehicle starts to tip. how high is its center of gravity
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1000 Hz. What is the speed of the bird
What is the net upward force on an airplane wing of area 21.9 m2 if the speed of air flow is 293 m/s across the top of the wing and 278 m/s across the bottom
The roof of the student dining hall at your college would be supported by high cross-braced wooden beams attached in the shape of an upside-down L. Each vertical beam is 10.0 ft high and 2.0 ft wide.
a roller coaster car is at the top of a "loop-de-loop" and is at the point where it is upside down. Why is there no outward force on the car
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