All Questions
Tagged with weight homework-and-exercises
46 questions
4
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How can you derive the formula for the apparent weight at any latitude on the Earth?
My textbook derives the formula for apparent weight at the equator, which is just equating the centripetal force to the difference between the true weight and normal reaction.
$$ mg' = mg + m \omega^2 ...
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1
vote
1
answer
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A tower with—apparently—different average weights depending on the inside activity
The apparent paradox involves a tower with internally pumped water that appears to have different average weights depending on the pumping configuration. Since the system is closed, we expect the ...
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0
votes
1
answer
37
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How does added weight of 100kg affect the height of a originally 1m stack of paper [closed]
Lets say i had a stack of papers, 1 meter tall. Assuming that each paper would be around 0.1mm in thickness, the total number of papers should be 10000. Now, when placing a weight of 100kg on top of ...
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0
votes
1
answer
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How much weight would the scale show if we get on a scale with springs on top of it? [closed]
Lets say we have a scale and on top of the scale there is a big spring and we get on top of the spring. Suppose we weight 70kg and spring itself weights 2kg and after we get on the spring we compress ...
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1
vote
1
answer
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Weight Distribution when lifting furniture with a partner [duplicate]
Help solving this question would be appreciated: As a short person at 5'3'' with short arms, I find it challenging to lift furniture with a taller person, because they always naturally lift the object ...
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0
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1
answer
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How much does the sky weigh? [closed]
How much does the sky weigh?
I don't know how much the sky weighs. Is the sky gravity?
I tried researching, but I can't find scientific information that is proven.
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1
vote
1
answer
299
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Tension force in kilograms [closed]
Suppose I want to buy a cable that will support & pull a mass of $2\ kg$ upward at an acceleration rate of $2 m/s^2$, I must specify the maximum mass the cable will carry.
I know how to calculate ...
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3
votes
1
answer
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If 1 gram force on Earth is 0.0098 N, what would it be on Mars or others?
I know that this is a very simple question, but I am not really sure about this. If 1 gram force on Earth is $0.001 \;\text{kg} \times 9.8 \;\text{m}\,\text{s}^{-2}$, what would it be on Mars or any ...
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2
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Max angle to avoid cart crash [closed]
How can I calculate max angle to avoid my cart to roll out or crash ? I need to move a weight of 3 kg at a height of 2 m, with a cart that weights 20 kg.
Here attached an image:
I would like to find ...
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2
votes
1
answer
303
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How can we find the total weight of a pulley apparatus? [closed]
I recently have been trying to solve this problem, which asks me to find T3 assuming that g = 9.8:
My idea was to find the ...
3
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4
answers
413
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In Newtonian mechanics, does the motion of an object change its weight (as opposed to mass)?
A wedge of mass $M$ is kept on a spring balance. A small block of mass $m$ can move along the frictionless incline of the wedge. What is the reading of the balance while the block slides? Ignore the ...
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1
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Newtons 2nd law experiment
I am conducting an experiment using a cart and pulley system. I am trying to measure the force that is accelerating the cart by using a dynamo-meter and pulling in the opposite direction. I think that ...
- 1,813
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2
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How much is my weight in Newtons? What is my Mass?
We refer to our earthly weight in "pounds" or "kilograms". The Force I put on my scale is mass × acceleration = mass × 9.8 m/s^2.
My scale reads 98 kg, yet the units of Newton are kg m/s^2. Do I ...
-1
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2
answers
219
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Force acting on an object traveling upwards (ignoring air resistance) [closed]
Could someone please help explain to me which formula should be used for a question like this...
A ball with the mass of 166.1 g is thrown vertically upwards with an initial velocity of 18.5 m/s. It ...
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2
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0
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the weight of a hose with water passes through it [closed]
a hose is connected to a water supply at the ground and is held by hand from point B. I want to calculate the tension at point B. but how does the resultant weight (W) of the hose will change if water ...
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0
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1
answer
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3 people carry a log of wood, which one is carrying the most weight [closed]
I saw this on a youtube video. The answer is that the one in the middle is carrying 25 % more than the other two.
Can someone explain this?
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5
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If F = $m*a$ and $W = m*g$, why is using $F = m*a$ to calculate weight wrong?
On a test I used $F=m*a$ to calculate the weight of an object on Earth, using $9.8$ $m/s^2$ for $a$. I got the right answer, but the question was marked as wrong because I used the wrong formula and I ...
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3
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2
answers
150
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What is the force exerted by the tire on the stone? [closed]
A stone with mass $m$ gets stuck in the tire of a car, whose radius is $r$. The car is moving at constant speed $v$.
The problem asks to determine the force $F$ exerted by the tire on the stone, ...
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0
votes
1
answer
660
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What happens to your weight when you go a specific height above the surface of the earth?
How would you use the Universal Gravitation equation $F=\frac{Gm_1m_2}{r^2}$ to calculate the weight of a person at a specific height above the earth?
If, for example, you were 6370m above the earth ...
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1
answer
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Show that the weight of an object suspended from two other objects is equal to the sum of the vertical components of the two weights [closed]
The following shows a mass with weight $M$ suspended from two other masses, labelled $m$
The system is in equilibrium, and the question following from this diagram is to show that $M=2m\cos\theta$...
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1
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51
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The weight of something in a specific gravity field [closed]
I am working on a project in my free time and need to know what the weight of a person who has a mass of 70 kg in a gravitational environment of 0.1035773536599592926 pound-force would be.
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3
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Apparent weight and true weight
I want to know what do we actually measure in a weight machine, true weight or apparent weight? Please help me in understanding this concept.
0
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1
answer
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Calculate weight needed to balance a beam
I have found many sources to determine the weight or force needed for a balance moment, but not one that included the weight of the beam as a variable. I assume this is a very simple equation. Please ...
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2
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Relatedness of weight, normal, and centripetal force
I'm taking a physics course. Since the beginning of the semester I've been troubled by this question: How do you determine how weight, normal and centripetal forces are related?
I've seen plenty of ...
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1
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2k
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How to calculate the maximal weight that a cable can support? [closed]
Exercise:
Exercise from Theory and Problems of Physics for Engineering and Science.
In the crane here the boom is $3.2 \text{m}$ long and weighs $1200 \text{N}$. The cable can support a tension of ...
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1
answer
79
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Absolute uncertainity in weight [closed]
An object has a mass of 88.60 kg ± 0.09 kg. I calculated the weight to be 869 N
but now I need to calculate the absolute uncertainty in weight.
My thinking was that the absolute uncertainty would be ...
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3
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2
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1k
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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 ...
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2
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493
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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 ...
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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$
$$...
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0
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0
answers
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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 ...
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1
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36
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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 ...
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2
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1
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562
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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,...
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2
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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\...
22
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Doesn't a box holding a vacuum weigh the same as a box full of air?
This was recently brought up, and I haven't been able to conclude a solid answer.
Let's say we have two identical boxes (A and B...
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2
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Possible solutions to the crown problem of Archimedes [closed]
My teacher was talking about the crown problem, possibly solved by Archimedes using skills about density, weight and other properties that he studied. In the original publication, by Vitruvius in a ...
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2
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What is the weight of the Philae lander on the Churyumov–Gerasimenko comet compared to earth?
We know the payload mass of the Philae lander was 21kg.
We know the mass of the Churyumov–Gerasimenko comet is roughly 1 x 10^13kg.
We know the mass of Earth is roughly 5.9x10^24kg.
I've heard ...
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2
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Does the weight of fluid in a conical container act entirely on the base?
Scenario description
Lets assume both containers have a capacity of 300 litres.
One is a vertical tube as shown in pic 1
Other one is more or less a V shaped containers as shown in pic 2
Both are ...
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5
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2
answers
6k
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Difference between weight of water and pressure of water
(I didn't even have a basic formal education in physics. I'm learning through the internet out of my own interest, so if there are any silly mistakes, kindly bear with and guide me through.)
...
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1
answer
2k
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Apparent weight on a hill and in a ditch [closed]
first time posting.
I'm trying to solve these 2 problems. I have a solutions I just don't know if I'm right...seems odd that they are the same answer...
1) If you are driving over a hill of radius ...
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6
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1
answer
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Calculating electric motor's weight lifting ability knowing power. What else do I need to know?
So, my company works with electric motors, and my boss wanted me to calculate how much weight could be lifted by a motor rated at 750W.
I know that I can't just calculate the work done by it without ...
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1
answer
6k
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Maximum Weight Sustained by wire / Breaking limit of wire [closed]
I know that breaking stress depends on material of wire, not on the diameter or the length of wire. and also that Breaking load depends on the area of cross section of wire. But still i have a ...
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6
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How the apparent weight varies due to the rotational motion of Earth?
I learned that as the earth rotates about its axis, the bodies on the earth also follow a circular path. In most books I read, they give the example of a person standing on a weight balance at the ...
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1
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Relationship between angles [closed]
Question: Find the relationship between angles $\theta$ and $\phi$
using the equations of equilibrium and solve for $\theta$.
Express your equation for $\theta$ in terms of $\phi$.
Hint: ...
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2
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3k
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What are the forces used in this weightlifting example? [closed]
You have a person doing a bench press. Their hands are equidistant apart and they are centered on the bar - each hand about 1.5 feet from center of the bar. The bar weighs 45 pounds.
In example 1 ...
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5
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If something weighs 25 kg, how do I find the mass of the object?
An object is falling and it weighs 25 kg (on a scale, presumably). What is its mass?
I know that weight is measured in Newtons and mass in kilograms, but what if a problem states that something ...
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1
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How does mass relate to resistance (Ohm's Law)
How can I relate $mg$ to $R$?
Just to give you a scenario: If a free hanging weight was tied to a motor... I know the voltage ($V$) and current ($I$) so I can use $V = IR$ to find $R$. What if I ...
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