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A parallel-plate capacitor has plates of area 0.16 m2separated by a distance of 0.004 m. What is the strength of the electric field between these plates when this capacitor is connected to a 4-V battery?
What is the angle of incidence in air of a light ray whose angle of refraction in glass is half the angle of incidence? Assume the refractive index of glass is 1.50
The antenna for an AM radio station is a 75-m-high tower that is equivalent to one-quarter wavelength, At what frequency does the station transmit
An energy storage system based on a flywheel (a rotating disk) can store a maximum of 4.0 MJ when the flywheel is rotating at 20,000 revolutions per minute
A train is rounding a circular curve whose radius is 2.00 multiply.gif 102 m. Find the magnitude of the total acceleration (centripetal plus tangential) of the train
A positron (q = +e) moves at 4.6 107 m/s in a magnetic field of magnitude 0.50 T. The magnetic force on the positron has magnitude 1.5 10-12 N. What is the angle between the velocity and the field
The two blocks of masses M and 2M shown to the right initially travel at the same speed v but in opposite directions. How much mechanical energy is lost to other forms of energy during the collision
A cafeteria tray dispenser supports a stack of trays on a shelf hangs from four identical spiral springs under tension, one near each corner of the shelf. Each tray is rectangular, 45.3 cm by 35.6cm, 0.450 cm thick, and with mass 580g. Demonstrate..
An athlete swims the length L of a pool in a time t1 and makes the return trip to the starting poisition in a time t2. (a) If she is swimming initially in the positive x-direction, determine her average velocities symbolically in (a) the first hal..
A converging lens (f = 24.6 cm) is used to project an image of an object onto a screen. Find the two object distances
What kind of mirror must be used and what must its radius of curvature be?
A woman stands a distance d from a loud motor that emits sound uniformly in all directions. find the sound intensity level relative to the threshold of hearing
The needle of a sewing machine moves up and down in the same hermonic motion its driving force comes from a rotating wheel that is powered by an electric motor. how do you imagine that theup-and-down needle comapres with the period of the rotating..
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