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An 800 kHz radio signal is detected at a point 9.5 km distant from the transmitter tower. Find the average electromagnetic energy density
a candle is placed at a distance of 15 cm in front of a concave mirror of radius 40 cm. where is the image of the candle
A 4.4 x 10^14 Hz laser emits a 2.1 mS pulse, 5.0 mm in diameter, Calculate the number of wavelengths in the length of the beam
Two geekie physics students with a combined mass of 122 kg jump into their old car to run out for some late night pizza. What is mass of the car
A 2000 kg car is traveling at a constant 15.0 m/s down a long mountain grade of 2.0%. The mountain road is 5.0 km long. What is the increase in the temperature of the brakes
A point rotates about the origin in the xy plane at a constant radius of 0.114 m and angular velocity of 7.40 rad/s. What is the amplitude of this motion
A down jacket has a surface area of 0.87 m2 and is filled with a 4.4 cm thick layer of down, At what rate is heat conducted through the coat
Find the diameter of an aluminum rod that would conduct heat at the same rate as a 2.816 cm diameter copper rod of the same length
When UV light of wavelength 260nm falls on a metal surface, the maximum kinetic energy of emitted electrons is 1.20eV. What is the work function of the metal
While looking into a silver Christmas ornament, If your nose is only 6.25 inches from the ornament, and the diameter of the ornament is 4.85 cm, how far behind the ornament does your nose appear
You are visiting a friend in the hospital and realize someone is following you. If you hare 2.50 m from the mirror and the focal length of the mirror is 75.0 cm, how far is the stalker really from you
The work function for zinc is 4.31 eV. Ultraviolet light of wavelength 144 nm is incident on the clean surface of a zinc sample. What is the photon energy of the ultraviolet light
We can roughly model a gymnastic tumbler as a uniform solid cylinder of mass 72.0kg and diameter 1.20m. What percent of his total kinetic energy is rotational
A polarized light beam, with a 7.33-mm-diameter circular cross section, is perpendicularly incident on an ideal polarizer, What force in piconewtons does the light exert on the polarizer
A magnetic field is directed at a 40.0 angle to a plane circular loop of wire with a radius of 26.8 cm. a) Draw a diagram showing the wire loop, compute the induced emf in the wire loop
Shaving/makeup mirrors typically have one flat and one concave (magnifying) surface. What is the focal length of the mirror
An object of mass 48.0 g is initially placed in boiling water so that it is at 105° C. Then the object is dropped into a calorimeter, Find the specific heat of the object
A helium atom (mass of helium atom = 6.646 x 10-27 kg), initially at rest, emits a photon of energy 40.8 eV. What is the speed of the Helium atom after releasing this photon
You would like to shoot an orange out of a tree with your bow and arrow. The orange is hanging 5.00 m above the ground. What is the height of the arrow above the ground once it has travelled the 43.0
A soldier is tasked with measuring the muzzle velocity of a new rifle. Knowing the principles of projectile motion, What muzzle velocity should the soldier report to his sergeant
A kid is outside his home playing with a metal hoop and stick. If the hoop starts from rest at the top of the hill and reaches a linear speed of 9.50 m/s in 11.5 s, what is the angular acceleration o
An angler hangs a 4.52-kg fish from a vertical steel wire 1.65m long and 5.47×10?3cm2 in cross-sectional area. Calculate the amount the wire is stretched by the hanging fish
A sample contains 8.90×104 radioactive nuclei. In a time of 5 minutes, 1.90×103 of the nuclei decay. Evaluate the half life of the sample
A 150MW laser pulse is focused with a lens to a diameter of 1.0?m. What is the laser beam's electric field amplitude at the focal point
Looking out the window of a train you observe the passengers on a second train moving in the opposite direction at a constant velocity. determines which of the two trains is actually moving