The tag has no usage guidance.

learn more… | top users | synonyms

3
votes
2answers
133 views

Does a scale weigh a bee flying inside a box?

This question is very similar to this one or even this one except some minor differences. The box is much larger than the bee. The box has no top cover. The bee is flying still in the middle of the ...
0
votes
1answer
56 views

Could vacuum chambers lighten the load for space bound technology?

Would cavities of near vacuums in the head (or in the 6 x 6 blocks surrounding the rocket [for reentry temperatures]) of a rocket make it lighter so it can be sent out easier?
3
votes
3answers
74 views

Fluid mechanics paradox: The force needed to 'balance' a fluid using a piston

We know that the pressure in a fluid (like water) is dependent on the depth. Consider this example: For the first setup, solving the pressure at the bottom yields $P_1 = \rho gh = 1000kg/m^3 \bullet ...
0
votes
2answers
58 views

Pressure due to weight of the fluid in fluid dynamics

In Bernoulli equation, the only term which corresponds to what one usually calls "pressure" is $p$, the other are still pressures dimensionally but their meaning is linked to kinetic and potential ...
2
votes
1answer
35 views

Does a degassed magnet weigh less than one that is not?

I learned matter with an electric current weighs more than matter with no current. Does that apply to magnetic material in the same way but with it's magnetic fields instead of electric current? A ...
1
vote
0answers
39 views

Centre of gravity of system [closed]

We have a uniform rectangular tray of dimensions 40x60, with weight 3. We place the coordinate axes in such a way that the bottom-left corner of tray is at the origin and the tray sides are parallel ...
-5
votes
1answer
57 views

Why is 1 kg of cotton heavier than 1 kg of stone? [closed]

I've been told that 1 kg of cotton has more density since Density = mass / volume, and volume of 1 kg of cotton is pretty big outside , and height of it very long, and stone is lighter because its ...
1
vote
2answers
44 views

Quick question on weight/mass [duplicate]

(In the US, just to clarify)So, from a physics perspective weight and mass are different, but when people are talking about weight in everyday(non-physics) situations ("how much do you weigh" etc.), ...
-1
votes
1answer
76 views

What is difference between 9.8 N (Kgwt) and 9.8 m/s^2 (g)?

What is difference between 9.8 N (Kgwt) and 9.8 m/s^2 (g)? What is difference between kg weight and gravity? I am not so good in physics so please explain in a lot of detail (but sorry for this silly ...
5
votes
4answers
2k views

How do astronauts measure weight/mass on other planets? [closed]

At the start of The Martian movie the astronauts collect samples, targeting for "100 grams". Hence the question ... what units do astronauts actually use? I did some quick google search but all I get ...
0
votes
3answers
42 views

Need to understand concept of Buoyant force

I want to know that is there any influence created by shape of container when apparent weight is calculated for example in following figure apparent weight in all container will same or not.
-2
votes
2answers
68 views

Does mass as a measure of inertia have a meaning in zero gravity? [duplicate]

Mass apart from the amount of material, is also a measure of the inertia of an object, ie. the resistance to change its motion. In zero gravity, does still mass count as the amount of inertia? In ...
0
votes
0answers
23 views

Weight or Mass? [duplicate]

I would like to ask about what bathroom scales indicate. I already read some forums about it but it just lead me into confusion. I know that it measures weight, but if it points to 70 does it mean ...
0
votes
1answer
52 views

Why are we mentioning weight of the product in kg? Why not Newton? [closed]

I am confused using this units. Why this changes happened?
-1
votes
1answer
94 views

Friction and surface area. How friction does not depend on surface area? [duplicate]

What will be minimum force required to move the objects in above pictures assuming the weight of the objects is same and material is also same. Will it different for each object or not? Thanks
-1
votes
1answer
60 views

Do you say it right? [closed]

If someone asks you your WEIGHT what would you answer in SI Units. My weight is x 'kilogram' My weight is x 'Newton'. As we know that weight is a force due to local acceleration and still most ...
1
vote
2answers
47 views

Weight of mass falling through liquid

If I place a container of fluid on a scale and drop a non-buoyant mass into the fluid, will the scale read less as long as the mass is in motion downward as compared to when the mass is at rest on the ...
-1
votes
2answers
131 views

What is my real weight? [duplicate]

My weighting machines notes my weight to be 65. Should I read it 65N or 65kg. PS: I only need a correct comment. This question is different, since, I know very clearly what mass and weight are. But ...
0
votes
3answers
42 views

Effect of internal force on the weight of an object

A man is holding a closed cage on the palm of his hand with a bird in it. When the bird flies with an upward acceleration inside the cage, it feels heavier. But the force due to the bird in the cage ...
3
votes
1answer
98 views

Do we feel 0.4% less body weight on mount everest?

Weight of the object at surface of earth(where $g=9.8066$). considering Weight=$100~\rm kg$ ,Weight ($W_1$)=$mg$ , mass=$10.1972~\rm kg$ At mount Everest top: Height of Mount Everest = $8.848\rm km$...
1
vote
1answer
39 views

Who can explain me better 'the condition with no weight'? [closed]

This is related to gravity and vaccuum, which says that when the body is in vaccuum, its weight is lost. I need any examples.
1
vote
2answers
43 views

Atmospheric pressure

What is the significance of atmospheric pressure being referenced as 100 kPa ? Does that really mean 10000 kg/m$^2$ acting upon us ? If we are measuring only collision force on the surface and not ...
0
votes
0answers
39 views

Force exerted by pulley on ceiling

I read in my book that when a pulley is accelerating it exerts more force on the ceiling than when it is still. I know the derivation and I can mathematically prove it but I'm unable to get my head ...
0
votes
1answer
26 views

How would you solve for this system while it's accelerating? [closed]

So I'm trying to solve for this system with two weights: m1 and m2, with m2 hanging off of m1, which is hanging by two ropes off a ceiling (connected to top of m1) one rope(t1) angled 50 degrees and ...
2
votes
1answer
138 views

Confused by gravity and weight [closed]

I know that $F = mg$ so $2,00 \textrm{ KG m} \cdot 9,81 \textrm{ N g} = 19,62 \textrm{ N F}$ Why does my book say that the weight of a $2,00 \textrm{ KG}$ object is $19,62\textrm{ N}$, the mass is $2,...
1
vote
2answers
49 views

Does air resistance give a falling skydiver weight?

An observer in free fall is weightless as he is accelerating at 9.8 m/s^2. However, when a skydiver jumps from a high plane, his acceleration gradually slows until becoming 0 m/s^2 at terminal ...
0
votes
0answers
16 views

Weight difference on full moon and no moon day [duplicate]

Since Moon has an impact of gravity, would same piece of mass be heavier on a no moon day (since moon is at opposite side, thus pulling downwards) and lighter on full moon day (since the moon is at ...
1
vote
2answers
124 views

What's the right way to calculate power consumption over a month given a rate per minute?

When I was searching for power required to lift an object, i found that, for example: $100\ \mathrm{kg}$ to be lifted 3 metres in 5 seconds. (vertical) Answer: $$\begin{align} \text{mass}\times\...
2
votes
2answers
47 views

Exertion of force due to spin of Earth

If Earth were to spin at a different speed would I be experiencing a different weight?
-2
votes
2answers
80 views

Could one extra straw literally break a camel's back? [closed]

I thought this was better suited here than biology, as the camel is figurative; it could also be a wooden beam. My question is basically: Could adding an object of negligible weight (such as a straw) ...
0
votes
4answers
60 views

Why consider only $x$ component of accelerating block pulled by cord at an angle?

A $5 \, \text{kg}$ block is pulled along a horizontal frictionless floor by a cord that exerts a force $F=12 \, \text{N}$ at an angle $\theta = 25 \, \text{deg}$ above horizontal. What is acceleration ...
1
vote
1answer
458 views

Force between two contacting masses on a frictionless surface pushed from left or right [closed]

The figure shows two boxes, with $m_1 > m_x$ that are on a level frictionless surface. We can apply a horizontal force $F$ either toward right on $m_1$ or toward left on $m_2$. The magnitude of the ...
0
votes
0answers
33 views

If the weight limit of 1 wheel is 125 lbs and can 4 of those wheels together handle higher than 125lbs sitting on the skateboard?

Say I buy a wheel that has a 125lbs max load. If I buy 4 of said wheels and put it on a skateboard/longboard, does my weight get distributed such that the max weight for all 4 wheels is higher than ...
0
votes
3answers
222 views

Should these be called “weights” or “masses”? [closed]

Yeah, those circular metal disks. Weights or masses? I call them weights because when I attach them to a spring I'm interested in their weight, but it feels odd saying a "Pick up the 100g weight". "...
4
votes
1answer
208 views

Why is the apparent weight smaller when you crouch down on a scale?

I am having a problem understanding the concept of the apparent weight change when you crouch down, stand up, and jump on the scale. What is happening that makes the scale change?
2
votes
1answer
64 views

Applying downward force on someone without adding to their weight

I am creating a scenario for a superhero comic, and need help with an idea. I'd like the solution to be based in scientific theory, or at least scientific fantasy, as opposed to resorting to simply ...
0
votes
0answers
21 views

Flamant's use of mass and weight

I apologize for the stupid question, but I've consulted teachers and found their answers unsatisfactory. Professor E.Brune, in the XIX century, delivered a course on l'École des beaux-arts on ...
-2
votes
1answer
251 views

Difference between mass and weight [duplicate]

I already know that when I standing on weighing machine it's measuring my mass not my weight, but when I take the same machine to moon it's will read different value. According to my information that ...
1
vote
2answers
111 views

Why is sometimes more difficult to lift a baby?

I have a small cousin and she enjoys when I pick her up, which I can do pretty easily. Sometimes though she decides she wants to make my life difficult, and when she decides so, she tells me she is "...
0
votes
2answers
43 views

Weight added to truck [closed]

If weight is added to the back of a dump truck does the height of the truck decrease in direct proportion to the weight added - does weight added equal height decrease?
1
vote
5answers
154 views

Reduced-gravity flight (A300 0-G): what is actually reduced?

I doubt I can hide from the effects of gravity when I'm close to Earth. We usually don't question this biker is fully experimenting gravity: Source. But with the well-known "reduced gravity" ...
2
votes
3answers
269 views

Would a person gain or lose weight after expelling a flatus?

Considering the chemical composition, mass, and pressure range of typical human flatulence, would a person gain or lose weight after passing gas?
1
vote
1answer
182 views

How exactly do walking canes and crutches help?

I am reading introductory physics, and there is a chapter on equilibrium. In the chapter, the author mentions how devices can exploit distribution of forces to help those that are physically ill, via ...
0
votes
1answer
211 views

How to design a stable table?

Imagine a round table, standing on one central leg. The central leg has a base for balance. That base is what I am referring to. What physics do I need to understand to design a stable table? For ...
1
vote
3answers
457 views

Scale on an elevator

When you are accelerating upwards in an elevator, you feel an increase in apparent weight. A scale measures the total amount of force pushing down on it, and if you were to step on a scale in an ...
0
votes
4answers
389 views

Why does not the weight decrease in an ascending and accelerating lift?

My textbook says that weight of a person in a lift that is accelerating in upward direction increases. But,why is it so? The acceleration of lift and the acceleration due to gravity are in opposite ...
3
votes
1answer
177 views

Feathers and Human Flight

In the case of Angels where they're supposed to have wings full of feathers and can fly. If we created a flight suit for humans made out of feathers, how big would the feathers have to be? If the ...
-2
votes
1answer
83 views

Weight of magnetic objects and polarization [closed]

I am an Iranian engineer and have a question which no one has answered me yet. In weighing a strong magnet, there is a difference between the weights from different polarization directions, why is ...
0
votes
1answer
41 views

Weight vector dependence

Does the weight of a person depend on the number of people or other bodies in say a room? If so,why? Was thinking about it earlier and want to find out from others.
0
votes
4answers
165 views

Units about weight

We know that weight is measured in Newtons. Since, $weight= mass\times gravity$. What will be the units of Newton? Will that be $N = kg\times g$ ? But we always measure our weight using the unit $kg$! ...