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In the Apollo 13 mission, how could the batteries have "no Volts" with two Amps of current?

In the movie Apollo 13 there's a scene when the LEM is losing power; when they switch the module on, one of the astronauts reads the levels and says that one battery has no Volts but 2 Amps. What did he mean?
user6396
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How do you calculate Mcr (critical buckling moment)

When designing a steel beam, the resistance to buckling is related to Mcr; the elastic critical moment for lateral-torsional buckling. However the Eurocodes give no advice about how to calculate this parameter. How would you calculate it?
thomasmichaelwallace
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Are latest software engineering methodologies, such as Agile, being adopted by other engineering disciplines?

I know comparatively little about general engineering methodologies, but it strikes me that the (now outdated) "waterfall" method is possibly very apt for mechanical engineering. Perhaps advances in rapidly changing software engineering could also…
Jodes
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Fixing a Roof with Toe-bearing Rafters

I have acquired an old loading dock built in 1930 that has toe-bearing rafters in addition to undersized purlins. As you can imagine, many of the rafters have sagged. Also, because of the toe-bearing design of the rafter, the building has no…
alfreema
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Force Balance Question

Hello, I've been asked to show that: $$d\Gamma=\tau 2\pi r^2 dr$$ Where $\Gamma$ is the torque applied to the shaft and $\tau$ is the shear stress of the sample fluid at radius $dr$. So, I know that $d\Gamma= Force\cdot dr$ and that $Force = \tau…
MathsIsHard
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How to protect a pressure gauge from condensation in a vacuum steam boiler?

Pressure gauges are protected from steam condensation in a regular boiler by using a siphon where steam condenses and prevents steam from going further up to the gauge. However in a vacuum steam boiler when the boiler is re pressurized after use the…
Manu de Hanoi
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How to manufacture cutting dies for metal foil?

I am making a die for cutting arbitrary shapes from thin (0.1–0.5 mm) copper foil/sheet using a manual arbour press. The product will be an oak leaf shape, approximately life-size, for use as part of a sculpture project. I am pretty experienced at…
Chris Johns
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Deriving the turbulent kinetic energy equation

I'm trying to understand the derivation of the turbulent kinetic energy equation, as described in this link: Evaluation of RANS turbulence models for flow problems with significant impact of boundary layers. I'm able to follow up to equation 2.26 on…
Paul
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Create a DIY light tube

I am working on a project to bring light into a bunker. The bunker is 3-4 meters below the ground. I am looking into bringing natural light into the space, instead of using electricity. The space is difficult to access and light must therefore be…
Sylvain
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mass calculation from transfer function or bodeplot

I have a double mass rotary model. The two masses are connected by an axis which together acts as a spring damper system of the fourth order. The system is actuated by a motor and the angle of rotation is measured by rotary encoders at each end of…
Somanna Thapanda
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Strength of a Vertical Round Aluminum Tube with load cantilevered off it?

Can a vertical round tube safely support a cantilevered arm mounted near the top of the tube? ROUND VERTICAL TUBE: 6061 Aluminum 2 inch Outside diameter 0.25 inch wall thickness 3 feet height ROUND VERTICAL TUBE / CANTILEVERED ARM…
serac
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Differential equation of the vertical displacement of a cable

Given a cable (totally flexible) fixed at both ends, subjected to a vertical force $f(x)$ in his plane, with variable area $A(x)$, and variable elasticity $E(x)$ I want to find the differential equation of the vertical displacement $y(x)$ in his…
Msegade
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How can I verify my engineering work experience without having worked under a PE?

First a little background, I've been working in Michigan as an engineer since getting my BSME in 1998 (I graduated with my MSME in 2010). I've worked for a number of companies in a variety of industries as an engineer, but never under the direct…
DLS3141
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Streamlines at the boundary of rotating and stationary domains are malformed

I am simulating a turbine and have divided the mesh into domains: the piping before and after the blade and the turbine blades. The domain containing the blades rotates at 2000 rpm while the other domains are stationary. The mesh is structure and…
user19061
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Truss manufacturer drawings unclear

I am currently looking at a set of truss layouts produced by our truss manufacturing partner for a residential building project. I have reason to believe these layouts are generated using Alpine (Intelliview?) software. In any case, the design…
user32882
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