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The neutral Helium atom is made of a nucleus (containing two protons and two neutrons) and two electrons. The electrons have an average separation from the nucleus of r = 31 pm.
Note: 1 pm = 10^-12 m (pico-meter)
Consider the average configuration of the Helium atom shown above, treating the nucleus as a point charge. What is the electrical potential energy of the Helium atom?
The eccentricity,e, of the Moon's orbit is 0.0549 and the mean orbital radius rL=(ab)^1/2 is 384,100 km. Calculate the lengths of the principal axes a and b of the Moon's orbit. How far is the center of Earth from the center of the elliptical orbit? ..
superman m 90 kg jumps over a 51 m tall building by first accelerating from rest to his maximum velocity in 0.003 s.
An ore sample weighs 17.0 N in air. When the sample is suspended by a light cord and totally immersed in water, Find the total volume of the sample
Calculate the work done on the tool by F if the tool is first moved out along the x-axis to the point x = 2.10 m, y=0 and then moved parallel to the y-axis to x= 2.10 m, y= 2.10 m.
A thermos contains 148 cm3 of coffee at 88.5°C. To cool the coffee, you drop two 12.2-gram ice cubes into the thermos. Estimate the final temperature of the coffee in degrees Celsius
Two cars start racing from rest. The track is 400 meters long and linear. Car A accelerates at 3.4m/s2 and Car B accelerates at 3.0m/s2. What is Car A's speed when it crosses the finish line
a converging lens f 13.0 cm is held 7.10 cm in front of a newspaper the print size of which has a height of 1.80 mm.
An ice chest at a beach party contains 15 cans of soda at 5°C. Each can of soda has a mass of 0.36 kg and a specific heat capacity of 3600 J/(kg·°C). Someone adds a 6.2 kg watermelon at 28°C to the chest. The specific heat capacity of watermelon is n..
Helium-Neon laser: "Lambda"= 632.8nm. We can observe the first order maximum at "theta"= 25 degrees. What is the second order maximum angle
Let F denote a certain temperature in degrees Fahrenheit, and C the same temperature in degrees Celsius. Then you can convert between F and F = 32 + 9/5 C. Suppose the temperature is 8 degrees Celsius. Enter here the corresponding temperature in d..
A laser emits a narrow beam of light. The radius of the beam is 9.6 mm, and the power is 1.9 mW. What is the intensity of the laser beam
A lunch tray is being held in one hand. The mass of the tray itself is 0.200 kg, and its center of gravity is located at its geometrical center. On the tray is a 1.00-kg plate of food and a 0.250-kg cup of coffee. Obtain the force T exerted by the..
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