# Questions tagged [homework]

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### Equilibrium equations of a rigid body in contact with elastic body

Consider a structure comprising an elastic deformable body (in pink) attached to a rigid body (in yellow) at the right side ( $\Gamma_c$ interface) and fixed at the left side. Assume a force $F$ is ...
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1 vote
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### Can I calculate differential settlement of sand using its compression index?

This is for an undergraduate lab report. I have been asked to calculate differential settlement of a sand layer based on the results of oedometer tests, but I’m not sure how to get there from the ...
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### How to find the image of an object in case of a tilted spherical mirror?

Problem A lens is used to obtain real image of a point(/small object) at $(75,0)$. This acts as the virtual object for a convex mirror of radius of curvature $100cm$ placed at $(50,0)$ tilted at $30°$ ...
39 views

### I was solving fluctuating load problems and the word "static" confused me

Here's a snippet of the question that was asked a couple of years ago in university exam: A cantilever beam made of cold rolled steel for which ultimate tensile strength =540 MPa and Yield tensile ...
21 views

### Can't find correct reaction loads for statically indeterminate problem

been working on this problem all day and I feel as if I am going crazy. I am using SkyCiv to confirm the right answer and cannot get close to it, I have messed up both my attempts at superimposing and ...
31 views

### How to calculate internal convection loss in a sealed container?

Say I have a box with a 1m x 1m x 1m interior wall dimension. The side walls and the floor are 10cm of styrofoam, with a thermal conductivity of 0.03 W/m K. The top is 1cm thick opaque plastic with ...
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### How do I derive the expression of boundary work in relation to a polytropic index?

I don't understand how to derive the formula, How do I derive the expression of boundary work in relation to a polytropic index? I used the Definition of boundary work for a polytropic index, the ...
19 views

### Energy conservation on SHM in springs

In the above spring block arrangements, the time period is asked for $K_1=2K$ left spring and $K_2=K$ right spring. Now at equilibrium, $$T=K_2x=Kx=mg$$ $$2T=K_1y=2Ky=2mg \implies x=y$$ for movable ...
22 views

### Hydrographic Survey Problem

I have been trying, but I can't figure out how I should solve this using the area velocity method. It is the only method as our professor taught us. Any help would be appreciated.
45 views

### Cooling steel by putting it in water ; what is the final temperature

Below is a problem I made up and did. I am hoping that you will tell me that my solution is right. Problem: A $5$g piece of steel at $30$°C is placed in $400$ ml of water at $20$°C. Assume that all ...
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### How to draw a isometric view of the block in the picture below?

Can anyone give me some guidance with this question? I'm finding it a bit difficult.How is the object suppose to look like?
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### How do I draw a circuit for a conducting loop inside a solenoid?

To solve a homework problem, I need to redraw the following diagram in circuit form. The large blue circle represents the solenoid. Inside the solenoid, the two gray semicircles represent a wire loop,...
1 vote
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### Impact of decreasing weight from a part of body w.r.t tipping

If I decrease the weight from top portion of the body keeping all dimensions same, the center of mass shifts downwards, but does it makes it more stable against tipping from perpendicular forces ? ...
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### Conical pulley system and transmission ratio (closed)

I tried asking this on other SE forum but i think this is the correct one: Basically our teacher has sent us quite a lot of exercises but I can't get past this one which says: a pulley cone consists ...
189 views

### Derivation of deformation equation given thermal expansion

I'm working on a thermal expansion problem out of Beer & Johnston's Mechanics of Materials and I'm a bit confused by the underlying rationale of one of the steps in the solution process. In the ...
134 views

### Calculating two diagonal forces

When I tried to calculate the force exerted on the rope 'a' I get that it is equal to 5N when the block has a force of 10N. Do I instead need to divide by 30 since the sum of the two angles is 30 ...
77 views

### Continuity / conservation of mass

Two different incompressible fluids a and b flow into a chamber through two circular ports of area 0.1 and 0.2 m2 respectively. Fluid a is of density 1,200 kgm−3 and flows directly into the chamber ...
159 views

### Vector homework problem [closed]

This is a question from Engineering Mechanics by Shames. I am unable to resolve this as the question mentioned.
131 views

### Dimensions of the wooden post

This question is regarding the following problem from Bending stresses in beams Problem: My solution and hence the answer doesn't match with the answer in the textbook. My Solution: The planks A will ...
196 views

### How is the wire in this problem in pure bending?

Problem: A beam is said to be in pure bending if the bending moment in it remains constant throughout the length. The problem asks to determine the bending moment in the wire. In the solution of the ...
1 vote
184 views

### A problem on beams

Problem - I have interpreted "by hinging them together at B" as following - Now if this is the case, then applying a load on the right beam will have no effect, in my understanding, on ...
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### Calculating Entropy from Gibbs Free Energy?

I guess Cp = dH/dT= dq/dT=dS Thus SdT = integral of CpdT. From that ∆H is given and we can calculate ∆G. However, entropy for this reaction should be -7.4J/molK and I am getting like 26J/molK. Also S ...