Since the acorn is thrown horizontally, the initial vertical velocity is 0 m/s. Let’s use the following equation to determine the time to fall 10 meters.
<span>d = vi * t + ½ * a * t^2, vi = 0, a = 9.8 </span>
<span>10 = 4.9 * t^2 </span>
<span>t = √(10/4.9) </span>
<span>This is approximately 1.43 seconds. Let’s use the following equation to determine the horizontal distance it moves. </span>
<span>d = v * t = 1.1 * √(10/4.9) </span>
<span>This is approximately 1.57 meters. To determine the horizontal distance between the acorn and squirrel, subtract this distance from 5 meters. </span>
<span>d = 5 – 1.1 * √(10/4.9) </span>
<span>This is approximately 3.83 meters. To catch the acorn, the squirrel must move this distance in the same time as the acorn falls 10 meters. </span>
<span>Average velocity = ([5 – 1.1 * √(10/4.9] ÷ √(10/4.9) = 2.4 m/s </span>
<span>I hope this helps you to understand how to solve this type of problem.</span>
Answer:
a. Mass number is the sum of number of protons and neutrons present in the nucleus of an atom.
A = p + n
Charge is a unit of matter that tells how more or less the number of electrons are present as compared to number of protons in an atom. A positive charge means the atom lacks electrons.
Gamma rays are highly energetic electromagnetic rays. They have high penetrating power and are very difficult to shield owing to high energy.
b. The compete nuclear equation is:
![^{210} _{89} Ac \rightarrow ^4 _2 He + ^{206} _{87}Fr](https://tex.z-dn.net/?f=%5E%7B210%7D%20_%7B89%7D%20Ac%20%5Crightarrow%20%5E4%20_2%20He%20%2B%20%5E%7B206%7D%20_%7B87%7DFr)
This is a alpha decay process because alpha particle which is Helium atom is being produced. Francium is being formed after alpha particle is emitted.
c. The complete nuclear reaction is:
![^{80} _{38} Sr \rightarrow ^0 _{+1}e + ^{80} _{37}Rb](https://tex.z-dn.net/?f=%5E%7B80%7D%20_%7B38%7D%20Sr%20%5Crightarrow%20%5E0%20_%7B%2B1%7De%20%2B%20%5E%7B80%7D%20_%7B37%7DRb)
This is a positron emission process where in Rubidium is being formed.
Its physical weathering and physical weathering can be sometimes called mechanical weathering it includes the processes which break rocks apart changing their chemical composition.
Before we start thinking about the snowball, we need to remind
each other that energy is "conserved". That means that if you
ever see energy decrease in one place, then the missing amount
must have gone somewhere, and if you ever see energy increase
in one place, then the energy that appeared must have come from
somewhere. Energy does not magically appear or disappear.
So you toss a snowball out of your hand. As you let it go, you give
it some kinetic energy, and it starts rolling along the ground.
Once you let go of it, it can't get any more energy (unless it has
some kind of little tiny engine inside it).
Kinetic Energy = (1/2) (mass) (speed)² .
and that amount can't change.
So if extra snow sticks to it as it merrily rolls along, and its mass
increases, then it must slow down.