Recent content by headshrinker

Homework Statement A glass manufacturer operates 11 months of the year and produces 97,000 tons of glass per year that needs to be cooled to ambient temperatures. The melting point of glass is 1673K and ambient temperature is assumed to be 293K. The specific heat capacity of glass is 0.837...

Homework Statement An industrial electrical load operates from a 50 Hz 10 kV (rms) line with a power factor of 60% lagging. Determine a range of values of a capacitance that may be placed in parallel with the load to achieve a 90 to 95% lagging power factor. Homework Equations Power factor =...

please help!

Homework Statement How do I calculate how hot a metal object will get if it's just left to be heated up by the sun? Homework Equations The two equations that i know of would be the specific heat capacity of the metal: Q = mCpΔT And the radiation equation: Q=εσAT^4 The Attempt at a...

Homework Statement Explain the advantages of using hollow cross sections against solid sections in beam bending applications. Homework Equations None The Attempt at a Solution I know this has something to do with the Neutral axis and the second moment of area for the beam but i...

Homework Statement Using sketches and equations briefly describe how Bernoulli's equation and other factors cause lift force to be generated by a wing. Homework Equations The Attempt at a Solution I'm struggling to find anything else that causes lift except bernoullis! please help!

thanks for your reply, but i still don't understand. why do the percentage pressure losses decrease as the mass flow rate decreases? what do u mean by boundary layers? thanks

Homework Statement [LIST] It was a standard venturi meter experiment where we calculated the theoretical and actual mass flow rates for different pressures and velocity's. the follow up questions were: -Compare the results of the coefficient of discharge obtained with typical values given...

i've done it! thanks anyway guys!

Homework Statement a 0.75kg brick is released from rest and slides down an inclined roof pitched at 30 degrees to the horizontal. the brick slides 2.5m before striking the gutter and the coefficient of friction between the roof and the brick is 0.3. determine the velocity at which the brick...

anyone?

i have no idea! I am new to this stuff! do u know? thanks!

Homework Statement (a) For the circuit below, the value of R is adjusted so that each of the two 10Ω resistors dissipates 10W. Calculate the value of the variable resistor R. (b) What is the value of R if it is adjusted to dissipate the maximum power possible? For this value of R...

Hi, how do i measure the statics resistance of a current/voltage graph and not the dynamic resistance? thanks!

oh i see. so the terminal voltage is the sum of the 2 currents from the batteries multiplied by the resistor?