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Some bacteria are propelled by biological motors that spin hair-like flagella. A typical bacterial motor turning at a constant angular velocity has a radius of 1.28 10-8 m, and a tangential speed at the rim of 2.24 10-5 m/s. How long does it take the motor to make one revolution?
determine the location Yc of the centroid C of the beam cross sectional area . then compute the moment of inertia of the area about the x axis.
A 60 ohm, 40 ohm, and 20 ohm resistor are each connected in parallel across a 120VAC source. What is the total current.
Determine a symbolic expression for the total thermal resistance of wall, including inside and outside convection effects for prescribed conditions.
If the trap door's weight is 50N. Calculate the tension in the string and the reaction at the hinge.
What is the acceleration of the aircraft (in m/s2)? How long does it take the aircraft to reach its take-off speed?
explain the following terms with respect to 4-storke cycle internal combustion engines strokebore ratio piston
Identify the mass properties that would be used to determine an appropriate size box to package 60 ABS Plastic (0.038 lb/in3) blanks and to ship them at $1.15 per pound.
An air compressor takes air from outdoors at 28deg C and 101.2kPa and compresses it to 790kPa and 50 deg C. The air input to the compressor is found to be 22.67m3/hr. Estimate the required Hp to operate the compressor.
If the filling is done rapidly, calculate the final temperature in the small cylinder, (a) assume that oxygen is an ideal gas with Cv= 5R/2 and (b) using accurate thermodynamic data for oxygen.
An elevator descends from rest with an acceleration of 5 ft>s2 until it achieves a velocity of 15 ft>s. Determine the time required and the distance traveled.
a cylindrical rod of steel e 30 x 106 psihaving a yield strength of 45000nbsppsi is to be subjected to a load of 2500
a civil engineer must design a wheelchair accessible ramp next to a set of steps leading up to a building. the height
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