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They are still here, for the most part. The former can be observed and their density is measured to be about 500 photons/cm^3, thus, there must be about that number density of neutrinos in the unive
Suppose that the speed of light in a vacuum were one million times smaller than its actual value: c = 3.00 × 102 m/s. The spring constant of a spring is 690 N/m. Determine how far you would hav
Radium is a radioactive element whose nucleus emits an alpha particle (a helium nucleus) that has a kinetic energy of about 6.8 × 10-13 J (4.2 MeV). To what amount of mass is this energy equiv
How far away from the highway would you need to build a house so that the noise from the highway is no louder than the rustle of leaves on the front lawn (10 dB)? Assume that the highway noise sprea
A typical human body has surface area 1.4 m^2 and skin temperature 33 degrees Celcius. If the body's emissivity is about 1.0, what's the net radiation from the body when the ambient temperature is 2
An LC circuit consists of a capacitor with C=2.90mF and an inductor with L = 30.0mH. At t = 0, the capacitor has a charge 6.30 mC and the current in the inductor is zero. The circuit oscillates at i
Assume that a signal passes through an opening of 4.23 m width between two adjacent buildings. What is the angular spread of the central diffraction maximum (out to the first minimum) for wavelength
A nuclear power reactor generates 2.5 × 109 W of power. In one year (365.25 days), what is the change in the mass of the nuclear fuel due to the energy being taken from the reactor?
A proton is confined to a nucleus that has a diameter of 4.8 × 10-15 m. If this distance is considered to be the uncertainty in the position of the proton, what is the minimum uncertainty in it
The kinetic energy of a particle is equal to the energy of a photon. The particle moves at 4.2% of the speed of light. Find the ratio of the photon wavelength to the de Broglie wavelength of the par
A step-down transformer converts 120V AC to 6.00V AC (rms values), and the secondary winding is connected to a purely resistive circuit having an equivalent resistance of 3.00W.. a. If the primary c
A 50.8-cm diameter disk rotates with a constant angular acceleration of 2.10 rad/s2. It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk ma
What is the gauge pressure at the top of the lead block? Assume that the weight of the ball is negligible and that the lake is deep enough that it does not hit the bottom. The densities of air, stee
A 6.30 cm tall object is placed 24.1 cm in front of a concave mirror with a focal length of 5.00 cm. What is the magnification?
Light is shining perpendicularly on the surface of the earth with an intensity of 680 W/m2. Assuming that all the photons in the light have the same wavelength (in vacuum) of 526 nm, determine the
A 336-g mass vibrates according to the equation x=0.4 cos(7.9 t), where x is in meters and t is in seconds. What is the period of the oscillation? Your answer should be in seconds and given to the
A spring is mounted from the ceiling. As a mass is attached, the spring stretches 1.04 m. The spring is then stretched an additional 0.2 m and released. What will be the frequency of the resulting o
A 146 g ball moving at -23 m/s is hit by a bat. The ball moves in the opposite direction at 14 m/s. How long did it interact with the bat if the average force was 210 N. Don't forget to include unit
The wire is at room temperature. A potencial difgerence of 5.0 V is maintened between the ends of the 2.0-m composite wire.what is the potencial difference between the ends of the silver section of wi
Suppose an atom having atomic number Z is ionized so that all but 1 of its Z electrons are removed. Predict the ionization energy of the helium ion (singly-ionized helium).
A 5.00-A current run throug a 12-guege copper wire (diameter 2.05 mm) and through a light bulb. Copper has 8.5x10^28 free electrons per cubic meter. a) How many electron pass throuh the light bulb e
How much time will it take the golf ball to make the journey to the satellite in the Earth's frame? How much time will it take in the golf ball's frame?
The width of the central peak of a single-slit diffraction pattern can be characterized by the distance of the first-order minima on both sided of the maximum or the full width at half maximum, the
A telephoto camera lens with focal length f = 300 mm and a maximum aperture f/2.8 takes a picture of two red (630 nm) LED lights that are 30 m away. If the resolution is diffraction limited, what is
Using x-rays of wavelength 0.14 Angstroms, you observe maxima when the reading on the goniometer is 12.5 degrees, 14.6 degrees and 16.7 degrees. What is the spacing between the crystal planes? Note