Recent content by n124122

Thanks for you reply! As far as I know, most materials reflect visible light better than (uv and) infrared light, except from metals and specially designed reflectors. Therefore, direct sunlight should generally be hotter than redirected sunlight per quantity of visible light. For example only...

With the total visible light flux being equal does reflected sunlight (by the sky, environment or shading/light redirecting surfaces) have a smaller total energy per luminous flux and therefore resulting heat gain than direct sunlight? Possibly caused by a larger luminous efficacy, i.e. more...

Not to annoy you, but how do you explain the definition of weight as a force? The definition of weight is (I assume) a force on a mass, thereby weight increases when an elevator goes up and decreases when it's going down. And when there is no surface or rope pulling on you, there is no weight...

Doesn't that sentence contradict itselve? because if it means weight is gravitational force on a mass, then it shouldn't always be down. For example on a slope, when a slope is 100% vertical, there is no weight (no gravitational force on mass, only gravity). But when the slope is a little more...

weight is the force of a body on a surface or on a rope. So why isn't it always perpendiculair to the surface, for example in a slope. When a slope is so steep that it's vertical, there is no weight. But when the slope is a little diagonal you talk about a weight (which faces down(to the center...

Alright thank you very much

So the noble gasses are atoms not molecules?

But moving the box faster requires a different energy, because for a faster movement you're using more force . Which acording the the work formula (W=F*s) leads to more energy?

The word molecule has several definitions, but which one is considered the right one? The biggest question is if a single atom is still a molecule. Some call a helium atom a (monatomic) molecule. But others state that a molecule is a bond between two or more atoms. Some also say a molecule is...

thank you very much

Homework Statement To me it makes more sense to use force*time instead of force*distance. Because when you are aplying force to an object that isn't moving you're still wasting energy. Or when you push a weight over the same distance with little force or big force, the amount of energy wasted...

Homework Statement Is the amount of work depending on the mass? Homework Equations W=F*s F=m*a The Attempt at a Solution attempt one: because if you have a higher mass, it takes longer to make a certain object move over a certain distance, but it doesn't matter because time isn't measured. For...

So the elektrons are just emittes in a chemical reaction with low energies?

Homework Statement When an instable atom emits alpha or beta particles. Doesn't the overal electrical charge of the remaining atom change? For example when an atom emits alpha decay, a helium core is emitted, this results in the lose of two protons (forthe radiating atom). But doens't this mean...

So you shouldn't round anything (in a large calculation) till the endresult? (even 530,014+,01=530,015? when this is just one step in the middle of a long calculation)