A bird is standing on a copper wire that has 200 A flowing through it. The distance between the bird’s feet is 4cm. The cylindrical wire that it is standing on has a diameter of 2cm. The bird has an resistance of 10 MΩ. a. What is the voltage drop between the bird’s feet? b. How much current is flowing through the bird and how much power is being absorbed by the bird? c. What happens to the bird?

Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.

Estimate the change in the gibbs energy and molar gibbs energy of 1.0dm3 of octane when the pressure acting on it is increased from 1.0 atm to 100 atm. the mass density of octane is 0.703 g cm−3

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in