Shma Shot about Physics

- Chosen by Voters Watch the video in the link which explains how to use prefixes.1a) 286.6 mmReplace milli by 10^-3= 286.6 x10^-3 m = 0.2868mb) 85 micro VReplace micro by 10^-6 = 85×10^-6 V = 8.5×10^-5 V in scientific notation = 0.000085V in decimal notationThe rest are done the same way.c) Replace milli by 10^-3 to get grams, the divide by 10^-3 to turn grams to mgd) Replace pico by 10^-12e) Replace G by 10^92a) Units are missingb) units are missingc) Divide by 1000 to turn grams to kg. (If you can't see this, pretend you have 1000g of sugar – what do you do to 1000 to get the number of kg?) Source(s): http://www.youtube.com/watch?v=3TG-SeyyV… 1 week ago 100% 2 Votes

- Chosen by Voters Work done by gravity is equal to the force acting on the object (its weight of 75 N) multiplied by the distance over which the force acts, 28 m in this case. So the work done by gravity is 75 * 28 = 2100 J. 4 weeks ago 100% 1 Vote

- Chosen by Voters A 1 month ago 100% 1 Vote

- Chosen by Voters the atomic mass of nitrogen is 14; there is 1 nitrogen atom in the molecule so the percentage of N is14/35 x100% = 40% 3 weeks ago 100% 2 Votes

Yes, there is centrifugal force. To explain, an object traveling in a circle, like a test tube in a centrifuge, will want to travel in a straight line, instead of a circle. So centrifugal force els the object away from the center of rotation.A good example of this would be the orbit of a planet. Gravity acts as centripetal force, pulling the planet towards the star, and without centrifugal force, the planet would be pulled into the star. But if there were only centrifugal force, no gravity, that planet would be flung in a straight line.For a centrifuge, the centripetal force is the centrifuge itself. Without it, the test tubes would be flung against the wall. There is no centripetal force inside the test tube, so the contents are flung away from the center of rotation. Source(s): Used to be a nerd 1 week ago I'll have to check my texts again because I distinctly recall reading somewhere that there was no such thing as centrifugal force. Thanks anyway

- Chosen by Voters Catenation of chemical bonds leads to the formation of inorganic polymers. However, inorganic polymers are mostly solids in the form of crystals. Typical inorganic polymers are diamond, graphite, silicates, and other solids in which all atoms are connected by covalent bonds.Atoms and their nucleiIn order to understand the covalent bond, we must take a look at the structure of atoms.During the 20th century, the investigation of the material world turned to the very heart of material world – the structure of atoms. The discovery of electrons in 1897 by J.J. Thomson showed that there were more fundamental particles present in the atoms. Fourteen years later, Rutherford discovered that most of the mass of an atom resides in a tiny nucleus whose radius is 100,000 times smaller than that of an atom. In the mean time, light beams were discovered to be made of photons which are equivalent to particles of wave motion. These discoveries created new concepts. When these concepts and discoveries are integrated, new ideas emerge. The result is quantum theory. This theory gives good interpretations of the phenomena of the atomic and subatomic world. In this microscopic world, distances are measured in nanometers (10-9 or 1e-9 meter) and fantometers (1e-15 meter, also called fermi, in honour of Fermi who built the first nuclear reactor).The electrons in an atom are confined by the electromagnetic force of the atomic nuclei. At this level, we need a quantum mechanical approach to understand the energy states of the electrons in the atom. However, we do not have the time to discuss this in details.http://www.science.uwaterloo.ca/~cchieh/…Goodbye 6 days ago 100% 3 Votes

Ok firstly to work out the time of how long it takes for the stone to hit the ground.Im assuming you have done the SUVAT equations right?S = 54U = 0 (this is for free fall so the U is 0)V = -A = 9.81T = -The equation we can use to work out time is:s= 1/2 x a x t²Plug the numbers in:54 = 1/2 x 9.81 x t²108 = 9.81 x t² (brought the 1/2 over and multiplied by 2)11.00 = t² (108 divided by 9.81)3.31 = t (squared 11.00)3.31 seconds.2) What speed? So the impact velocity.You can use the v = u +at equation to work out the impact velocity of free fall with no initial kick of 20m/s.v = 0 + 9.81 x 3.31v = 32.5ms-1 or just 32.5m/sTHIS IS JUST FOR FREE FALL NOW WE NEED TO WORK OUT THE IMPACT VELOCITY WHEN IT IS KICKED AT 20M/S.The easiest way to picture the next part is to draw a horizontal line across your paper signifying the horizontal vector of 20m/s. And then a vertical line down your paper connected to the horizontal way signifying the vertical vector which was 32.5m/s (just a free fall).If you know what im getting at you can see a right angled triangle. Join up the horizontal and vertical lines are you get the hypotenuse which is the impact velocity when the ball or stone is kicked at 20m/s.C² = 20² + 32.5²C² = 1456.25C=38.7m/s or ms-1.Impact velocity is 38.7m/s. 1 week ago its was 3.32s so had to change and plug in but thanks so much!

- Chosen by Voters When you have immiscible solvents, the nylon will be formed only at the interface of the liquids, allowing you to reach in with forceps and pull out nylon continuously, as more will keep forming.If the liquids were miscible, they would mix together and a mass of fibrous nylon would be formed at once, rather than allowing you to draw out a string. 4 weeks ago 100% 1 Vote

- Chosen by Voters Lasers are very dangerous. Specially pointing it at the sky, as it if hits an aircraft, you are in big trouble. The department of homeland security has classified that as a terrorist act. There are hundreds of incidents where a pilot was partially blinded and the co-pilot had to take over. If that occurs at a time where the co-pilot were not available, you can have a crash and kill hundreds.In general powerful lasers can be used only indoors, in an windowless room with controlled access, and anyone in the room must use the correct safety glasses (which vary depending on type of laser).The problem is not just the beam hitting someone's eye, the problem is that the beam can be reflected off any shiny object, like a piece of metal or glass, travel through a window, and still damage someone's eye.Lasers are NOT toys. They are dangerous instruments and must be handled correctly and with care. 2 weeks ago 100% 3 Votes

- Chosen by Voters The amount of kinetic and potential energy will constantly be changing. It will have its maximum potential energy at the top of the first hill and on top of the loop and any other hills in your roller coaster. The maximum kinetic energy is at the bottom of the first hill but it will lose and gain kinetic energy through out the ride. KE = 1/2*m*v^2 –> the faster it goes, the more Kin. energy it will havePE = m*g*h –> higher it is, the more pot. energy it will have since mass is constant on the roller coaster. 1 month ago 67% 2 Votes