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(a) Calculate the radius of the orbit for the innermost electron in lanthanum assuming it is relatively unaffected by the atom's other electrons.
(b) What is the ratio of this orbital radius to the 6.2 fm radius of the lanthanum nucleus?
An engine does 20000 J of work and rejects 6120 J of heat into a cold reservoir whose temperature is 285 K. What would be the smallest possible temperature of the hot reservoir.
Two pieces of steel wire with identical cross sections have lengths of L and 3L. The wires are each fixed at both ends and stretched so that the tension in the longer wire is five times greater than that in the shorter wire.
A supply plane needs to drop a package of food to scientists working on a glacier in Greenland. How far short of the target should it drop the package
The diameter of a sphere is measured to be 6.94 in. Find the radius of the sphere in centimeters
Find the acceleration of an elerton in this field. What is its speed after 50ms.
A laser produces a 6.50-mW beam of light, consisting of photons with a wavelength of 621.9 nm. (a) How many photons are emitted by the laser each second? Incorrect: Your answer is incorrect. Your response differs significantly from the correct ans..
A flywheel turns through 28 rev as it slows from an angular speed of 3.3 rad/s to a stop. Assuming a constant angular acceleration, find the time for it to come to rest
Two point charges, +3.09 µC and -6.05 µC, are separated by 1.33 m. What is the electric potential midway between them?
An electron starts from rest 2.88 cm from the center of a uniformly charged sphere of radius 1.99 cm. how fast will the electron be moving when it reaches the surface of the sphere
The mass of one small ball is 1.59 g, and the mass of another is 881 g. If the center to center distance between thse two balls is 13.5 cm, calculate the magnitude of the gravitational force that each exerts on the other.
The construction of a flat rectangular roof (4.7m x5.3m) allows it to withstand a maximum net outward force of20007N. At what wind speed will this roof blow outward
An isotope of the element Thallium, Tl-206, undergoes beta decay with a half life of 3.1 minutes. Assume you begin with 1.0 grams of the thallium isotope, what mass of the isotope will be left after 9.3 minutes have elapsed?
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