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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?
The Earth has an angular speed of 7.272·10-5 rad/s in its rotation. Find the new angular speed if an asteroid (m = 4.97·1022 kg) hits the Earth while traveling at a speed of 5.79·
The speed of sound in air is 343 m/s. (a) What is the integer n that describes the harmonic whose frequency is 715 Hz? (b) What is the length of the tube?
The musical notes and corresponding fundamental frequencies of two of these strings are G (196.0 Hz) and E (659.3 Hz). The linear density of the E string is 7.06 x 10-4 kg/m. What is the linear dens
A clean room is kept at a positive gauge pressure of 0.025 kPa with respect to the outside to minimize contamination from the outside. Assume that the door to the room has dimensions 0.7 m x 2 m. Wh
A certain defibrillator sends 0.12 C of charge through the heart. The capacitor responsible for holding this charge before it is released has a capacitance of 95 oF. How much energy is released when
What is the rotational inertia of the merry-go-round if a constant tangential force of magnitude 200 N, applied 1 m from the axis of rotation, was required to accelerate it? What was the angular spe
A 950kg compact car is moving with the velocity v1=32x +17ym/s. It skids on an icy, frictionless patch and collides with a 450kg hay wagon moving with velocity v2=12x + 14ym/s. If the final velocity
The International Space Station orbits the Earth at an average altitude of 362 km. Assume that its orbit is circular, and calculate its orbital speed. The Earth's mass is 5.97×1024 kg and its