Why did scientists expect that the nucleus contained more than just protons?
a. By symmetry arguments about protons.
b. Because nuclei have about half as many mass units as can be explained by the amount of their positive charge.
c. Because without the negative charge of the neutron, electric repulsion between the positively charged protons would tear the nucleus apart.
d. Because nuclei have less mass than could be accounted for by the amount of their positive charge.
e. Because nuclei have approximately twice as many mass units as can be explained by the amount of their positive charge.
e
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Cubes of sugar, 1 cm on a side, are placed in water at 25ºC. Estimate the time before the lumps have dissolved; that is, when the sugar concentration at the lump is 10% by weight. Assume that the diffusivity of sugar into water is 6.9 x 10^-10m^2/s, the convective mass transfer coefficient is 6.4 x 10^-6m^2/s, and the self-diffusivity of sugar is 1 x 10^-5m^2/s. The density of sugar may be taken as 1500 kg/m^3.
What will be an ideal response?
The diffusion constant for water in air is
What is the distance a water molecule can travel by diffusion in 10min?
A. 17 cm B. 20 cm C. 25 cm D. 31 cm E. 36 cm
Capacitance of capacitors depends upon
A) the material between the conductors. B) the geometry of the conductors. C) the space between the conductors. D) all of these answers. E) none of these answers.
If F = 40 N and M = 1.5 kg, what is the tension in the string connecting M and 2M? Assume that all surfaces are frictionless
a.
13 N
b.
23 N
c.
36 N
d.
15 N
e.
28 N