# Questions tagged [homework]

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### 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 ...
• 103
37 views

### 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?
31 views

### 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,...
34 views

### Differences on methods of solution on problem

It is asked to find the velocity and acceleration of the plataform: Determine the velocity and acceleration of platform $P$ as a function of the angle of cam $C$ if the cam rotates with a constant ...
• 126
1 vote
35 views

### 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 ? ...
• 113
48 views

### 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 ...
96 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 ...
92 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 ...
58 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 ...
79 views

### Vector homework problem [closed]

This is a question from Engineering Mechanics by Shames. I am unable to resolve this as the question mentioned.
91 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 ...
104 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
133 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 ...
192 views

1k views

### 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 ...