Answer:
the difference of electrical potential between two points.
Answer:
A. 1.73 x 10^5 J
Explanation:
The internal energy of a gas is related to the average speed of the molecules of the gas. In fact:
- The internal energy, U, is directly proportional to the temperature of the gas, T, according to

- The temperature of the gas, T, is proportional to the square of the average speed of the molecules, v, according to

where both terms represent the average kinetic energy of the molecules.
- Therefore, we can conclude that the higher the internal energy, the faster the average speed of the molecules: among the choices given, the sample with highest internal energy is sample A.
Answer:
(a) ![[Y_{p} ]_{max} = \frac{2f}{1+f}](https://tex.z-dn.net/?f=%5BY_%7Bp%7D%20%5D_%7Bmax%7D%20%3D%20%5Cfrac%7B2f%7D%7B1%2Bf%7D)
(b)
;
= 0.026
Explanation:
Since the neutron-to-proton ratio at the time of nucleosynthesis is given:

Therefore:

Then, to determine the maximum ⁴He fraction if all the available
neutrons bind to all the protons. Since, there are 2 protons and 2 neutrons in a ⁴He nucleus, it shows that there would be
nuclei of ⁴He.
In addition, a ⁴He nucleus has a mass of
, where
is the mass of one proton. Thus,
nuclei of such nuclei will have a mass of
*
.
Assuming that
, there would be a total of
protons and neutrons with a total mass of
.
Thus:![[Y_{p} ]_{max} = \frac{2f}{1+f}](https://tex.z-dn.net/?f=%5BY_%7Bp%7D%20%5D_%7Bmax%7D%20%3D%20%5Cfrac%7B2f%7D%7B1%2Bf%7D)
(b) Given:
; τ
= 3*60s = 180 s
![f_{new} = \frac{n_{nf} }{n_{pf} } = \frac{exp (-200/180)}{5 +[1- exp(-200/180)]} =\frac{0.077}{5.923} = 0.013](https://tex.z-dn.net/?f=f_%7Bnew%7D%20%3D%20%5Cfrac%7Bn_%7Bnf%7D%20%7D%7Bn_%7Bpf%7D%20%7D%20%3D%20%5Cfrac%7Bexp%20%28-200%2F180%29%7D%7B5%20%2B%5B1-%20exp%28-200%2F180%29%5D%7D%20%3D%5Cfrac%7B0.077%7D%7B5.923%7D%20%3D%200.013)
= (2*0.013)/(1+0.013) = 0.026
Answer:
Explanation:
heat lost by block of copper
= mass x specific heat x fall in temperature
= .04 x 385 x ( 95 - 24 )
= 1093.4 J
Heat gained by water
= .105 x 4200 x ( 24 - T ) ; Here T is initial temperature of water .
= 441 ( 24 - T )
heat lost = heat gained
1093.4 = 441 ( 24 - T )
24 - T = 2.48
T = 21.52 ℃
The momentum, p, is the product of the mass and the velocity:
p = m*v = 0.145 kg * 40 m/s = 5.8 kg*m/s