A steel tank filled with helium gas doesn’t rise in air,

Conceptual Physics 12
Problem 28E The proportionality constant ?k? in Coulombs law is huge in ordinary units, whereas the proportionality constant ?G? in Newtons law of gravitation is tiny. What does this indicate about the relative strengths of these two forces?

University Physics 13
Problem 2DQ Suppose several different parallel-plate capacitors are charged up by a constant-voltage source. Thinking of the actual movement and position of the charges on an atomic level, why does it make sense that the capacitances are proportional to the surface areas of th

Physics: Principles with Applications 7
Estimate by what factor a person can jump farther on the Moon as compared to the Earth if the takeoff speed and angle are the same. The acceleration due to gravity on the Moon is one-sixth what it is on Earth.

Chemistry 11
Tin(II) fluoride (\(\mathrm{SnF}_{2}\)) is often added to toothpaste as an ingredient to prevent tooth decay. What is the mass of F in grams in 24.6 g of the compound?

College Physics 12
Problem 69GP Figure P17.67 shows the light intensity on a screen 2.5 m behind an aperture. The aperture is illuminated with light of wavelength 600 nm. a. Is the aperture a single slit or a double slit? Explain. b. If the aperture is a single slit, what is its width? If it is a double slit, what is

Organic Chemistry 9
The Stork enamine reaction and the intramolecular aldol reaction can be carried out in sequence to allow the synthesis of cyclohexenones. For example, reaction of the pyrrolidine enamine of cyclohexanone with 3-buten-2-one, followed by enamine hydrolysis and base treatment, yields the product indicat

Macroeconomics 22nd
What determines the vertical intercept of the Security Market Line (SML)? What determines its slope? And what will happen to an assets price if it initially plots onto a point above the SML?

Psychology 5
Hypnosis has been proven to have a. an effect on physical strength. b. a positive effect on memory retrieval. c. an analgesic effect. d. an age-regression effect.