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Determine the resultant of the forces and the distance from the ground to its line of action when (a) P=200N, (b) P=2400N, (c) P=1000N.
Find the maximum height h we can have if the environmental pressure is 100 kPa and temperature is 25C. Take the saturation pressure of water at this temperature as 3.17 kPa.
Compute the ASTM grain size number for this alloy. Be careful, this picture is not taken at 100X. You will first need to calculate the number of grains per square inch at 100X.
Determine the minimum force P required to initiate motion of the block up the incline. m = 10kg, (mu)s = 0.3, (mu)k = 0.1 and = 30.
A cast- iron cylinder of 300mm bore carries a pressure of 30 newtons per square millimitre; what should be its thickness for a unit working stress of 25 newtons per square millimetre?
If the PDF for the drift in volts is f(x) = (3/4)(1-x^2) lxl < 1 , f(x) = 0 lxl > 1 What is the expected value of the Taguchi loss? With the PDF given in b, what fraction of the regulators do
What is thermal energy storage? How does it differ from thermal energy generation? What role do the terms play in a surface energy balance?
Consider the surface of a solid that is at an elevated temperature and exposed to cooler surroundings. By what mode(s) is heat transferred from the surface if (1) it is in intimate (perfect) contact
What two outcomes characterize the response of an opaque surface to incident radiation? Which outcome affects the thermal energy of the medium bounded by the surface and how?
During the same 10 minutes, heat transfer occurs at a constant rate of +10 W from the surroundings. Find delta T, the increase in temperature.
Determine the maximum acceleration of the truck such that the rope doesn't break. Friction is not negligible and static friction and kinetic friction are 0.4 and 0.25, respectively.
During practice, a player P punts a ball B with a speed Vo=25 ft/s, at an angle theta = 60 degrees, and at a height h from the ground.
Calculate the normal stress (positive if tensile and negative if compressive) in the bronze sleeve. The normal strain (positive if stretched and negative if compressed) in the bronze sleeve.
Ammonia vapor flows through a valve. It enters the valve at a pressure of 8 bar and a temperature of 120C and after going through a throttling process it exits at a pressure of 3.5 bar.
The entrance is square edged. Calculate the flow rate if the depth of water in the storage tank is 60.2 feet above the inlet (and outlet) of the pipe.
If the pipe diameter is 30 cm, compare the head loss calculated from (a) the Darcy-Weisbach equation, (b) the Hazen-Williams equation, and (c) the Manning equation.
The angle between the velocity of the charge and the field is 54°. A force of magnitude 4.5 10-3 N acts on the charge. What is the magnitude of the magnetic field?
An electron is shot vertically straight up from the ground with a speed of 2.20 106 m/s. What is the magnitude of the acceleration caused by the magnetic force?
A mummy picks up a calculator and starts adding odd whole numbers together, in order: 1+3+5+....etc. What will be the last number the mummy will add that will make the sum on his calculator greater
Calculate the work necessary to compress air in an insulated cylinder from a volume of 6 ft^3 to a volume of 1.2 ft^3. The initial temperature and pressure are 50 F and 30 psia, respectively.
Calculate the work done by the gases, assuming they can be approximated by air with constant specific heats. Answer is 205 KJ/kg.
Determine the range of values of h for which the roller coaster will not leave the track at D or E, knowing the the radius of curvature at E is (rho)=75ft. Assume no energy loss due to friction.
An airplane wing modeled as a spring-mass system with natural frequency 40 Hz is driven harmonically by the rotation of its engines at 39.9 Hz.
A weight attached to a spring of stiffness 525 N/m has a viscous damping device. Determine the amplitude and phase when a force F = 2cos3t acts on the system.
If this same system is excited by a harmonic force of frequency 4 cps, what will be the percentage increase in the amplitude of forced vibration when the dashpot is removed?