Aloop of wire of radius a = 35 mm has an electrical resistance r = 0.036 ω . the loop is initially inside a uniform magnetic field of magnitude b0 = 1.5 t parallel to the loop's axis. the magnetic field is then reduced slowly at a constant rate, which induces a current i = 0.20 a in the loop. how long does it take for the magnitude of the uniform magnetic field to drop from 1.5 t to zero?

Glass is transparent to visibile light under normal conditions; however, at extremely high intensities, glass will absorb most of the light incident upon it. this works through a process known as multiphoton absorption. in this process, several photons are absorbed at the same time. if very intense light whose photons carry 2ev of energy is shined onto a material with a band gap of 4ev, that light can be absorbed through two-photon absorption, because two photons have the right amount of energy to bridge the band gap. what is the minimum number of photons of 800-nm light that are needed to equal or exceed the band gap of fused silica glass

An astronaut on the moon throws a baseball upward. the astronaut is 6 ft, 6 in. tall, and the initial velocity of the ball is 3030 ft per sec. the height s of the ball in feet is given by the equation s equals negative 2.7 t squared plus 30 t plus 6.5s=−2.7t2+30t+6.5, where t is the number of seconds after the ball was thrown. complete parts a and b.

Which of the following characteristics is fixed, or definite, for all states of matter?