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 ...
Bob's user avatar
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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?
Jeremiah Forrester's user avatar
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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,...
elvishpotato's user avatar
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0 answers
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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 ...
Thales's user avatar
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1 vote
2 answers
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 ? ...
pxm's user avatar
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1 answer
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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 ...
DJcrafter5606's user avatar
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1 answer
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 ...
nukespace's user avatar
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3 answers
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 ...
Matthew's user avatar
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1 answer
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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 ...
user36483's user avatar
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1 answer
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Vector homework problem [closed]

This is a question from Engineering Mechanics by Shames. I am unable to resolve this as the question mentioned.
Heisen Berg's user avatar
3 votes
2 answers
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 ...
Harshit Rajput's user avatar
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2 answers
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 ...
Harshit Rajput's user avatar
1 vote
4 answers
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 ...
Harshit Rajput's user avatar
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1 answer
192 views

Definition of Bandwidth as angular frequency

I am searching for a Formal Definition of bandwidth given the transfer function of a system, or the bode plot. Is it the frequency $\omega_b$ in which $$20log|H(j\omega_b)| = -3\text{dB}$$ or $$20log|...
Anonymous's user avatar
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3 answers
95 views

I am struggling to get the right answer regarding the quantification of entropy

1 kg of air in a piston-cylinder apparatus can exchange heat only with a reservoir maintained at 300 K. When 10 kJ of work is done on the air, its state is asserted to change from 1 bar 300 K to 2.5 ...
user36483's user avatar
2 votes
2 answers
72 views

A problem from Damped free Vibrations

Problem: I can understand the problem physically that the block is pulled by some amount X so that its displacement at t=0 is X. It is then released from that position so that its velocity at t=0 is ...
Harshit Rajput's user avatar
-1 votes
3 answers
121 views

how far can two spinning wheels send a tennis ball [closed]

so lets say i have two spinning wheels above each other separated by a distance 'x' and I send a tennis ball between them- how do I find the distance the ball would go? using Kinetic energy= ...
Henry's user avatar
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4 votes
1 answer
119 views

How to determine the dynamic response of a spring-mass system?

The Problem I have the following system for which I would like to determine its dynamic response, taken from these lecture notes pg.20: where the forcing functions are $u_1 = 1-U(t - t_0)$, $u_2=0$, ...
kostas1335's user avatar
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Filler material effect on metal

Okay, my teacher said that if a filler material is added to metal it is possible with increasing filler content to observer: Yield strength increase, Young modulus decrease, Resilience and elongation ...
Ranulph teee's user avatar
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2 answers
733 views

How to Find the Magnitude of Force and Direction

Give me some tips on how I can find the magnitude of $F_3$. The hint maybe is the angle of inclination of w axis such that the force components are equal along that axis, my instructor once told me. ...
Aiden's user avatar
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1 vote
0 answers
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how do i formulate a kalman filter for an upwash coefficient?

I want to make a kalman filter that will estimate the upwash coefficient $C_{\alpha_{up}}$ my state vector: $ X_k=[u \ v \ w \ C_{\alpha_{up}} ]^T $ My measurement vector: $ Z_k =[\alpha_m \ \beta_m ...
aadil095's user avatar
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0 votes
2 answers
485 views

Maximum induced bending stress within the beam

The Maximum induced bending stress within the beam. Given that: $$\frac{My}{I}$$ The beam depth is 300mm, the width is 150mm. The beam is an I section beam with a 5mm wall thickness. My ...
Kyle Anderson's user avatar
-1 votes
1 answer
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 ...
Mohammad Ahmad's user avatar
0 votes
2 answers
180 views

2D- Truss Member Analysis

I am a graduate student trying to sharpen the direct stiffness method skills. However, I am stuck at the beginning. The problem is given in the image. Can someone help me to write down all the nodal ...
Yirmidokuz's user avatar
1 vote
2 answers
183 views

What are the conditions for a signal to be an energy signal and a power signal?

I know how to find the power and the energy of a signal. What I have a problem with is knowing whether a signal is an energy signal or a power signal. According to my teacher, a signal is a power ...
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