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The sound transducer (generator) is circular with a radius of 1.95 cm, and it produces a sound intensity of 6.48 × 103 W/m2. How much time is required for the transducer to emit 5080 J of sound
The same magnetic field is then used to deflect the singly charged Ook IMO a circular path of r 16.5 cm. what velocity was selected? What was the ion mass?
The starting current in a dc motor is 20 A but it normally operates on 110 volts with a back emf of 90 volts. What is the resonance in the windings? What is te current at normal load?
A nonreflective coating (n = 1.24) covers the glass (n = 1.52) of a camera lens. Assuming that the coating prevents reflection of yellow-green light (wavelength in vacuum = 563 nm), determine the m
The distance between the objective and eyepiece is 14.0 cm. If a blood cell subtends an angle of 2.1 x 10-5 rad when viewed with the naked eye at a near point of 24.0 cm, what angle (magnitude only)
You and Maria each own identical spaceships. As you fly past Maria, you measure her ship to be 96 m long and your own ship to be 100 m long. How long does Maria measure your ship to be? How fast is
An anatomist is viewing heart muscle cells with a microscope that has two selectable objectives with refracting powers of 100 and 320 diopters.
An RC circuit with 5 uF and 3.30 Mohms includes a 20 volt source. What is the time change constant for charging the capacitor? What voltage is across the capacitor 18 sec after charging begins?
Since these eyeglasses do not completely correct her vision, she must hold a newpaper 42.00 cm from her eyes in order to read it. She wears the eyeglasses 2.00 cm from her eyes. How far is her near
A transformer with 120 turns in it's secondary supplies 12 volts at 220 ma to a toy train. The primary is connected across a 120 v wall outlet. How many turns are in the primary? What's the primary
When a 50 mF capacitor is attached to an AC source, its capacitive reactance is 40 Ohms. If instead a 100 mF capacitor is attached to the same source what will be its capacitive reactance?
After impact the block rises 5.10 m above the table. what was the speed of the bullet before striking the block?
An electron with kinetic energy 4.90 keV circles in a plane perpendicular to a uniform magnetic field. The orbit radius is 10.0 cm. Find the following values.
For current I = 6A being passed thru the inductor, calculate (a) magnetic field inside the coil, (b) energy stored within the coil and (c) energy density inside the coil.
If the two waves interfere destructively, what is the longest possible value for the wavelength? Assume the light is visible light (400-700 nm) and keep three significant figures in your calculation
Astronomers are proud of their telescopes and often say they "resolve a dime at so many miles." How many miles can you move a disk (D=3 cm) froma 148 cm diameter telescope mirror and just resolve it
A transformer has 355 turns in the primary coil and 197 in the secondary coil. By what factor does it change the voltage?
The solar year (equinox to equinox) is 365.2422 days, not 365. 25 days. Convert the difference to minutes and seconds. Show that adding a leap year every four years would still create a problem of
During an earthquake a tall building sways back and forth every 6.0 seconds. The top moves a maximum 2.4m from vertical. Calculate the distance from vertical after 4.0 seconds.
Light of wavelength 657.9 nm is emitted by a star. The wavelength of this light as measured on Earth is 659.3 nm. a. How fast is the star moving with respect to Earth?
Sunlight strikes the surface of a lake. A diver sees the Sun at an angle of 28.4° with respect to the vertical. What angle do the Sun's rays in air make with the vertical?
A ray of light in the coating is incident on the plastic-glass boundary at an angle of 10.5° with respect to the normal. At what angle with respect to the normal is the ray transmitted into the
A defect in a diamond appears to be 2.18 mm below the surface when viewed from directly above that surface. How far beneath the surface is the defect?
A meter stick balances horizontally on a knife-edge at the 50.0 cm mark. With three 6.30 g coins stacked over the 21.4 cm mark, the stick is found to balance at the 49.3 cm mark. What is the mass o
What must be the minimum initial speed of the dar so that the combination makes a complete circular look ater the collision?