Weight Definition and 1000 Threads

Homework Statement So for my homework assignment in 'Materials Science and Engineering', We were given the following problem. 1. Li and Ra both are both BCC metals. For this problem assume they form a complete solid solution (even though the very large difference in their atomic size tell us...

Homework Statement The largest piece of equipment that an astronaut on Earth can lift has a weight of 392 N. On the Moon, the acceleration due to gravity is only 1.62 m/s^2. a) What is the mass and weight of the same piece of equipment on the Moon? b) What is the mass and weight of the largest...

So I have been asking my self these questions lately. I know it is some basics of physics and I should probably know the answer.. Why do we feel weightlessness when we hit the acceleration of gravity (9.8) exactly? Probably so that the surface that we are standing on doesn't need to produce any...

+ 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 is actually an internal force on the cage, and internal forces don't cause acceleration of...

Homework Statement why the author said the equation 3-4 as energy per unit weight ? as gamma = rho g , gamma has the unit of kg(m^-3)(ms^-2) = kg(m^-2)(s^-2) , gamma is clearly not weight ... Homework EquationsThe Attempt at a Solution

Homework Statement A meter stick (thus, the length of the stick is exactly 1 meter!) is supported by two supports. Support A is located at the 20-cm mark, and support B is at the 68-cm mark. You can assume that the mass of the meter stick is uniformly distributed along the length of the stick...

Homework Statement The rain cloud has an approximate volume of 6.50 mile3and an average height, top to bottom, of 350 ft.1 mile = 5280 ft. If a cylindrical container 6 ft in diameter collects 2 in. of water after the rain falls out of the cloud, estimate the total weight of rain that fell from...

Hi, I'm doing a high school physics project that involves a small toy car tied to a bottle filled with pressurized air. By removing a certain thumb tack on the bottle, an orifice is exposed which expels a stream of air that acts as a force of thrust. I'm going to measure AND theoretically...

Homework Statement Why the weight of water at water surface is given by formula 2(pi)Rσ(cos angle) ? Homework EquationsThe Attempt at a Solution

Homework Statement How many moles is 0.01 gram formula weight of NaCN?Homework EquationsThe Attempt at a Solution I thought it meant 0.01/49 moles of NaCN. The solution simply says 0.01 moles. Why?

I'm writing a piece of fiction that, if my understanding of the subject is correct, will include a bit of chemistry knowledge. (In explaining my question, I'm going to spell out some obvious things. I'm terrible at math, and hence even worse at chemistry) For example: Atomic weight is...

Many of you might have seen veritasium's video on the "Anti-gravity wheel". Through one of the comments, I was introduced to the idea that the reason the apparatus is so easy to lift is because the energy to do so comes from the spin of the wheel, i.e. its rotation slows down as it is lifted and...

Homework Statement The block of weight of 100N is pulled by a rope over a pulley of small block with m kg . A 200N forec also acts horizontally as shown . If thge kinetic coefficient = 0.25 , static coefficient = 0.3 , determine whether the block is moving when the block is in moving or...

I have a stepper exercise machine that stands on four legs and I would like to place this machine on a shelf made of canvas cloth ( the whole wardrobe is made of canvas ). The problem is I think the shelf would tear where the four legs are. So I would like to ask if there is any way I could...

I have a stepper exercise machine that stands on four legs and I would like to place this machine on a shelf made of canvas cloth ( the whole wardrobe is made of canvas ). The problem is I think the shelf would tear where the four legs are. So I would like to ask if there is any way I could...

Homework Statement See image attached. Oh it's part c by the way. Homework Equations maybe upthrust=weight of water displaced... None really relevant. The Attempt at a Solution I thought the balance would initially go up as the sphere entered the water, (but maybe slightly less than the...

if I throw a ball of iron on the ocean, the velocity in which it will sink will be lower at the beginning and higher getting near the deepest part of it? As it may be forced by the pressure of water? (the weight of water)

Whats the significance of Atmospheric pressure being refereed as 100kPa ? Does that really mean 10000 kg/m2 acting upon us ? If we are measuring only collision force on the surface and not the weight of the entire column of air above us, then why figure 100kPa (100000 N force/m2) which is huge...

I need to buy a DC motor for an electric skateboard project. I need to calculate the speed at which it can travel with a person on top. I can calculate the speed at which the skateboard can go but is does not account for the weight of a person as that will surely decrease the speed. What formula...

Homework Statement Hypothesize a human with a weight of: 61.14 kg (not an abnormal specimen in this wise). density of a human body: 985 kg/m^3Homework Equations What is the volume in cubic meters of such a hypothetical person? The Attempt at a Solution The mass of this person is determined...

If I have a human specimen with a WEIGHT of: 61.14 kg, and then divide by 9.8 m/s^2 (g), then the specimen has a MASS of: 6.24 kg. So...is this wrong, or right? Is there one type of kg for weight, and another for mass? As I understand it: weight is a measure of force, whereas mass is a...

I have a hammock that is rated to 400 lbs. I want to use two neodymium magnets to suspend the hammock from two steel posts. Do I need two magnets rated 400 lbs each?

I need some help with something that seems rather simple, but I don't know how to apply the formula. Let's say I have a table and based on the particular material from which it is constructed, it has a strength to weight ratio of 50 kN·m/kg. If I were to place an object on the table that...

Homework Statement Object immersed in fluid. If weight larger than upthrust, it sinks. If less, it floats. If weight equal to upthrust, it floats, right? Thanks! Homework Equations N/A The Attempt at a Solution N/A

1. Which will have the greater force during impact; a bumble bee being hit by a train or a train being hit by a bumble bee? (Hint: Newton’s Three Laws of Motion) 1. What is the centripetal force that holds the Earth in orbit around the sun? 1. How much does a 76.0 kg person weigh on Earth in...

Homework Statement A 30-kg child is on a rotor ride at a carnival. The radius of the rotor is 3 m and it completes 0.4 revolutions in one second. The coefficient of static friction is 0.6. What is the magnitude of the child's apparent weight? Homework Equations ΣFx : FN = mv2/r ΣFy : Ff = Fg...

I need some advice on my design for a tablet holder that I want to get 3-D printed using a printing service, not my own printer. I need to decide which material to use and how thin I can make it. I asked for advice already on a 3-D printing forum, but they could only tell to find out through...

If i am standing on bathroom scales and i lift a weight, what will it do to the reading on the scales? I assume that lifting the weight will involve a force from my arm on to the weight, and an equal and opposite force will then push back, causing be to weigh more?

In a race car, coming off a slow turn and going into a long straight approaching a slow turn. if two identically powered cars (say 400hp at the rear tires but one at 3000lbs and the other at 3500lbs) are racing, would one car require more capable brakes than the other? I subscribe to the laws...

Hey guys, hope this is in the right place first off, but anyway, for one of our engineering projects we are required to design a "rover" that can transport a maximum of 40 pounds (the increments in weight increases by 10lbs per run starting at 10lbs and ending at 40) a minimum distance of ~20...

Its the age old question which weighs more, a ton Styrofoam Balls a 1/4" in diameter or a ton of Steel Balls a 1/4" in diameter? Of course the answer is that both weigh the same. Now seeing as both weigh the same which would cause more harm to you if you stood underneath of them and let them...

Homework Statement When the train has passed at the point C, the radii of curvature is 20 m and the apparent weight is 2 2 times bigger than the real weight. At the moment when the picture was taken, the train was at the point s, located 8 m higher than the hollow C. At s, the radii of...

I am trying to determine the weight capacity of a steel storage shelf i am making. The shelf will be 119in long with a 10in upright every 37in. The shelf will be made out of 2x2x1/4 HSS. In order tod etermine how much it can hold, do i determine how much each 10in column can support with a force...

I attached picture. I took the F=GMm/r^2 equation and did it for both Earth level, (radius of earth) with 650/9.8 as m and for F at the top of the building, with r being the radius of the Earth plus a mile (1.609E3 m). Please help?

I have tried to get some answers related to a humans ability to produce power and torque on cycling forums with mixed response. So I came to the experts to help me out! Basically some cyclist belief that the maximum torque a human can produce is solely limited by their body weight keeping them...

If interactions with the Higgs field make something have more mass, and if movement creates interactions with the field, then wouldn't something at absolute zero have no weight (zero speed, so no interaction with the Higgs field)?

I want to be able to tip a can by building a device that fits inside the can and is able to tip it even when the can is completely closed. I have a motor and an arduino to control it. Would I be able to tip it by spinning a weight around the vertical axis of the can? Or would action and...

Homework Statement Hello Everybody, When i was searching for power required to lift an object, i found that:- For Example, Q :- 100 kgs to be lifted 3 metres in 5 seconds. (vertical) A :- Mass * Gravity * (Distance / Time) = 100 * 9.8 * (3/5)...

Homework Statement A thin uniform circular tube is kept in a vertical plane. Equal volumes of (The liquids subtend a right angle at the centre) two non miscible liquids whose densities are a and b respectively fill half of the tube as shown. (The diagram depicts a>b) In equilibrium the radius...

I have a question in my textbook where I'm given weight of a "penguin in a sled" as 80N but the object is on a 40 degree angle. Is it telling me that on a normal flat surface the weight is 80N so that way to figure out the force of gravity on the x-axis I must divide the W by 9.8 then plug in my...

In tower cranes counterweights are placed on the counter jib to prevent the crane from falling over. Whereas on mobile cranes the counterweights are placed directly behind the cabin. The crane in itself also acts as some counterweight. My question to you is: How much weight can an object support...

A rock with a weight of 10 N is resting on a table. A student makes a number of statements about this situation, are they right or wrong? 1. "The weight of the rock is a force of 10 N by gravity in the downward direction" I don't see anything wrong with this. 2. "The reaction force to this...

I've been trying to lose weight a few times but each time failed not knowing what to eat. What should I be eating to burn as much fat as possible? I know I should avoid carbohydrates and drink water regularly. Does eating salad changes anything? What else should I be eating? Currently weighing...

I've heard that all the stars, planets or other heavenly bodies constitute only a little amount of mass of the universe. And we know that the rest other thing in it is black matter that can weigh something as I don't think that light or sound waves weigh something. So is it the black matter...

Homework Statement I was wondering about how the placement of weight affects Soap Box Cars. I have been racing them for 5 years now, and I cannot find any information. I was wondering if there was a formula to find the relationship between speed and weight, and how to solve it. For instance, if...

Homework Statement Hello there, this is my first thread here ! I've been trying to solve an exercise from my statics course and just couldn't get anywhere. Basically it's a system of two springs connected by a rope, and each spring is attached to a cylinder (Both Cylinders have same mass). The...

Homework Statement 17. Give the correct tension, T, in the marked rope for each situation. The rope is held so the system is stationary. All ropes and pulleys are massless and frictionless. A) T = W B) T = W/2 C) T = W/3 D) T = 2W E) T = 3W/2 F) T = 2W/3 G) T = W/7 H) T = W/5...

Homework Statement I place a water filled beaker on an electronic balance and zero the reading. Meaning the balance will not be measuring the weight of the water and the beaker. a.) If a ball is resting at the bottom of the beaker. What would the balance be measuring? b.) If I immersed and...

Homework Statement A helicopter is used to fill buckets with water to drop on fires. The bucket is a hemisphere with a diameter of 2 meters and a mass of 25 kg. The helicopter lowers the bucket into a lake or reservoir to fill it a) What is the weight of a bucketful of water? [/B]Homework...

in ASTM C127 Aggregate test , why the weight of SSD is higher than water submerged weight?