# JamSmith

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• Favorite Area of Science
Mathematics, Physics
1. ## Turning Effect of Forces

Thanks for detailed information and clarification.
2. ## Turning Effect of Forces

I was wondering about this solution. Well, thank you Sriman Datt. Oh ok, I am grateful to you for your more precise discussion.
3. ## Turning Effect of Forces

I got your point, I can also follow this right? Moment (Nm) = Linear force applied at a point (N) X Perpendicular distance between applied point and pivot point (m) We can then specify the rotational equivalent of Newton's laws: 1. If the moments on a rotating object are balanced then the object remains stationary or at constant angular velocity. 2. If the moments on a rotating object are unbalanced then the object will have an angular acceleration. 3. Moments are balanced by equal and opposite moments The rotational equivalent of Newton's first law is often called "The principle of moments", which is "if the sum of the clockwise moments is equal to the sum of the anticlockwise moments, the object does not rotate or rotates at constant angular speed".
4. ## Turning Effect of Forces

But if the beam isn't rotating (balanced), so I have to consider the clockwise moments equal the anti-clockwise moments?
5. ## Turning Effect of Forces

I was solving some online physics question papers. Can anyone explain, what is Turning Effect of Force? & also guide me how to solve this: A uniform beam of 1 m is supported at the 50 cm mark. Given that a weight of 2 N hangs at the 30 cm mark, how far away from the pivot must another weight of 4 N be hung to balance the beam?
6. ## Why does kinetic energy increase as velocity squared?

Thanks. I have found much more clues to solve my doubts.
7. ## Why does kinetic energy increase as velocity squared?

The formula for kinetic energy is E=[1/2]mv^2 and the formula for momentum is P=mv. I ran into these in physics class long ago and was really bothered by the first formula. How can energy go up as the square of the velocity?
8. ## Physics Question Related Pressure

Thank you, both for the guidance.
9. ## Physics Question Related Pressure

Maybe the potato chip bag was sealed at the surface pressure. And the pressure at the top of the mountain is less than surface pressure. So the packet's pressure is higher than the outside pressure and that is the reason why bag inflates like a balloon. I think I am doing right! I am not sure about what you asked If the air outside hotter, I am just assuming that, " If the air outside hotter then maybe the bag will slowly inflate like a balloon..!! Because the air has a certain amount of heat, which it carries with it as it rises". or The air inside expands until the pressure inside is the same as that outside. Some weather balloons explode at height.
10. ## Physics Question Related Pressure

I am not tech savvy. But I like to solve quiz relates math and physics. I was solving such questions and come across this question. "On a cloudy day, a sealed packet of potato chips is taken to the top of a mountain. The packet is found to be blown up like a balloon." What is the reason behind it? I found two reasons as per my knowledge, 1. The air outside the packet is hotter than the air inside the packet or 2. The air outside is now at a lower pressure than the air inside the packet. Which one is the right reason? Please guide me in detail.
11. ## Help me to find it out

The dew point is the temperature at which air is saturated with water vapor, which is the gaseous state of water. I have also read that Dew point is closely linked to relative humidity, which is the ratio of the pressure of water vapor in a parcel of air relative to the saturation pressure of water vapor in that same parcel of air at a specific temperature. Is this satisfying description? Yes, I have noticed that, and also research on it last night. I sum up with this: The fog in the mirror is the moisture of water vapor as it abuts a colder surface. With the cold water, we just cool down the bathroom. So the vapor came from the hot shower, mostly condense and will not reach the mirror. At the same time, if we do something opposite like vapor comes from heat or hot air will become less likely on the warmer surface. For air containing a certain amount of moisture, there is a maximum temperature at which the water will Epitomize. This is called the dew point. Right?
12. ## What if gravity acted like magnetism?

I was recently reading a topic about: What if gravity acted like magnetism? While I was studying about it, I come across the information which makes me little blunt about basic information. My questions arise when I read "If you have a positive charge the first thing it does is repeal all the other positive charges around it and attract all the negative charges." I this happens because of magnetism and the electric force? Is that true that they tend to cancel themselves out? And if its true than what is the reason behind it?
13. ## Help me to find it out

I am not sure about it, may be 20° C or below I have only tried it on glass. If Discussiong about Window panes then I observed that when Cooling outside the window fog up inside. The higher the dew point, the longer it will take for the glasses to clear.
14. ## Help me to find it out

Hi everyone, I was solving some real time physics question and come across this question. I have tried to find out the perfect answer but couldn't satisfied with my analysis. Can anyone guide me? On a cold, dry winter day your glasses fog up when you go indoors after being outside for a while. Why is that? And if you go back outside with your glasses still fogged up, they quickly clear up. Why is that?
15. ## Where does the energy come from when two objects gravitate towards each other?

Thanks for the new insight. So can follow this information right? The force of gravity is proportional to the size of the object (mass) and your position relative to it (distance from the center of gravity). Here is the formula: g=-GM/(r*r), where, g is the acceleration of gravity, G is the gravitational constant, M is the mass of the object and r is the radius or the distance of the observer from the center of gravity.