Differential Equation
find a general solution
dx/dy =[ -2x (csc 2y – 2x3 cos 2y)] / sec 2y
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Unanswered Posts
Differential Equation
dx-(1+2xtany)dy=0
Please help me to solve that
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[HELP] Method of Section and Joints
Please help me solve this one!
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Differential Equations
Help me with this please.
The topic is Additional Topics in Ordinary DE of the first order.
y(3x^3 -x +y)dx + x^2(1-x^2)dy =0
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physics
a force of a baseball swing. a baseball ha mass 0.145 kg
a. if the velocity of a pitched ball has a magnitude of 45.0 m/s and the batted ball's velocity is 55 m/s in the opposite direction, find the magnitude of the change in momentum of the ball and of the impulse applied to it by the bait.
b. if the ball remains in contact with the bat for 2 m/s, find the magnitude of the average force applied by bat.
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Price that an investor is willing to pay for the mine
The annual income from the mine is P100,000 and the life of the mine is 20 years. Find the price that an investor is willing to pay for the mine if he considers that money is worth 5% and if he is to accumulate a sinking fund at 6% in order to replace the capital he invested.
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DE: $(x²+4) y' + 3 xy = x$
(x²+4) y' + 3 xy = x
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Normal shock wave
1. Consider a NSW with a downstream-upstream temperature ratio of 3.5 what is the mach number upstream and downstream of the shock? Show your solution.
2. The flow just upstream of a NSW is at SSLC and the mach number downstream is 0.6152 determine the pressure, temperature, density, velocity, and the total pressure and temperature. Show your solution
3. The mach number behind of a NSW is 0.4752
What is the mach number in front of the wave and the pressure ratio across the shock? Show your solution.
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Help please :( - Flange Bolt coupling
A flanged bolt coupling consists of two concentric bolt circles. One bolt circle consists of six 0.5-in-diameter steel bolts on a circle 9 inches in diameter and the other consists of eight 0.5-in-diameter steel bolts on a circle 12 inches in diameter. What is the shearing stress in the bolts if a torque of 7 kip-ft is to be carried by the assembly?
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