Physics, 13.04.2021 14:40 jtgarner402

If the atomic masses of hydrogen and helium are 1.007825 u and 4.002603 u respectively and the neutron mass is 1.008665 u. Calculate the binding energy of alpha particle

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Answer form flower;

Answer from: Quest

All these statements are related to drake's equation. it is a probabilistic equation that shows an aproximate number of civilizations in our galaxy that we can communicate with. all the numbers that are inserted into equation are not precisely known so the result varies from 1000 to 100,000,000. the equations was not created to calculate exact number of extraterrestrial civilizations but to increase scientific knowledge how to find them.the equation is: $n= r_{*} *f_{p}*n_{e}*f_{l}*f_{i}*f_{c}*l$ where: n= represents the number of civilizations in our galaxy that we could in principle communicate with today. $r_{*} =$ the average rate of star formation in our galaxy $f_{p} =$ the fraction of those stars that have planets $n_{e} =$ represents the number of planets in the galaxy that are in principle capable of having surface liquid water and life. $f_{l} =$ essentially represents the probability that life eventually arises on a habitable planet. represents the number of life-bearing planets in the galaxy. $f_{i} =$ epresents the total number of planets on which intelligent beings have evolved and developed a communicating civilization at some time in the galaxy's history. $f_{c} =$ essentially represents the probability that on a planet with life, some organisms will eventually evolve to the point where they can build radio telescopes. $l =$ is a factor that depends on how long civilizations that reach our level of technology are able to survive.

Answer from: Quest

There's nothing on the list you provided to which that law applies.

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Free body diagram: force of gravity $f_g$ pointing down, with normal force $f_n$ with same magnitude, pointing up.in horizontal direction, there is only friction force $f_f$ , pointing opposite to direction of motion.so the net force comes from friction force (gravity and normal cancel out).=== $f_g = mg = (20\text{ kg})(9.81\text{ m/s}^2) = 196.2 \text{ n}$ normal force is $f_n = -f_g = -196.2 \text{ n}$ friction force is, with $\mu = 0.3$ $\begin{aligned} f_f & = \mu f_n \\ & = 0.3 \cdot (-196.2 \text{ n})\\ & = -58.86\text{ n} \end{aligned}$ therefore, $f_{net} = -58.86\text{ n}$ and $\begin{aligned} f_{net} & = ma \\ a & = \frac{f_{net}}{m} \\ a & = \frac{-58.86\text{ n}}{20\text{ kg}} \\ a & = -2.943\text{ m/s}^2 \\ \end{aligned}$ we have kinematic equation $\begin{aligned} v^2 & = v_0^2 + 2ad\\ v^2- v_0^2 & = 2ad \\ d & = \dfrac{v^2- v_0^2}{2a} \end{aligned}$ if initial velocity $v_0 = 10\text{ m/s}$ final velocity $v = 0\text{ m/s}$ acceleration $a & = -2.943\text{ m/s}^2$ then $\begin{aligned}d & = \dfrac{v^2- v_0^2}{2a}\\ & =\dfrac{0^2- 10^2}{2(-2.943)} \\ & = \text{$16.989$ m} \end{aligned}$ 16.989 m, or 20 m for one significant figure.

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If the atomic masses of hydrogen and helium are 1.007825 u and 4.002603 u respectively and the neutr...

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