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mechanical oscillations can be described in general by the following function: y(t)= e^(-t/m) *sin(wt+phi). where (t) is time and (w) is the oscillation angular frequency in radians per unit time.
write a function that calculates the average of a set of numbers. name the function calculate_average. the function should accept one input which is an array of numbers.
What are the annual runoff coefficient (Runoff /Rainfall ratio) for the sub areas and for the total watershed taken as whole Sub-area Area (m2)/ Annual Precipitation (mm)/ Annual Evaporation (mm)
Estimate the constant rate of withdrawal (in m^3/s) from a 1375 ha reservoir in a month of 30 days during which the reservoir level dropped by 0.75 m in spite of an average inflow into the reservoir
aluminum foil used to package food is approximately 0.001 inch thick. assume that all of the unit cells of the aluminum are arranged so that a is perpendicular to the foil surface.
water flows at a velocity of 25 ft/s at a depth in a rectangular channel 16 feet wide. Determine the downstream depth necessary to form a hydraulic jump, the head loss through the jump and the horse
The storage in a reach of river is 20,000 m^3 at a given time. Determine the storage 1 hr later if the average rates of in flow and out flow during the hour are 20 and 18 m^3/s, respectively
If a certain watershed received 1,250 mm of rain during a year, stored 150 mm of water in its soil mantle, and lost 400 mm of water downstream, how much water (in mm) was lost to the atmosphere (mai
A catchment has an area of 150 ha and a runo /rainfall ratio of 0.40. If due to a 10 cm rainfall over the catchment a stream flow at the catchment outlet lasts for 10 hr, what is the average stream
A flat plate weighing 220 N slides down a 15 degree incline with a velocity of 2.5 cm/sec. A thin film of oil with a viscosity of 1.29 N.sec/m^2 separates the plate from the ramp. if the plate is 50
Determine the force required to drag a small barge (10 ft by 30 ft) in a shallow canal (3 inches deep) in order to maintain a velocity of 5 ft/sec. Assume that the fluid is behaving in a Newtonian f
A round bar of 6mm diameter is made of 6061-T6 aluminum. When the bar is stretched by an axial force P, its diameter decreases by 0.450 microns. what is the magnitude of the load P
The subcritical water level in the channel downstream from the stilling basin is at an elevation of 100 feet above the datum. assume no energy loss over the spillway, determine the invert of the sti
If a torque of T = 1,100 N-m is applied to the composite assembly, determine: (a) the maximum shear stress in the aluminum tube and in the steel core. (b) the rotation angle of end B relative to end
Two ropes are attached to the eye bracket. The resultant force R of the two forces equals 1000-lb and the line of action is directed along the x-axis. if the magnitude of force F1 is 250-lb, determi
The rain¬fall amounts at three adjacent stations A, B, and C were 4.2, 3.7, and 4.9 in., respectively. The average annual precipitation amounts for the gauges are X = 36.5, A = 42.1, B = 37.1, a
The pivot of each 120 kg seat on a Ferris wheel travels in a circle with a 10 m radius, and the Ferris wheelrotates witha rotational speed of 0.1 rad/sec. What is the interaction force between the f
water flows into a weigh tank for 30 minutes. Calculate the increase in weight of the tank, if the discharge is 1.5 ft^3/s. The temperature is 50 F.
For a same soil, two moist densities and their corresponding degrees of saturation are given in the following table Density (kg/m^3) S(%) 1700 55 1800 70 What is the void ratio (e) and the specific
Consider a diver weighing 200 lb at the end of a diving board that cantilevers out over 3 ft. The diver oscillates at a frequency of 2 Hz. What is the flexural rigidity EI of the diving board
At a given instant, the position of a plane at A and a train at B are measured relative to a radar antenna at O. Determine the distance d between A and B at this instant.
Determine the mass and specific volume of argon gas in a vessel at 150 kPa and 20°C. The vessel is spherical, with radius 5 m.^5
Calculate the volume of a cylinder that contains 60 lbm of carbon dioxide at 230°F and 23 psig pressure. Assume atmospheric pressure to be 14.7 psia.^4
A container with volume 0.2 m^3 holds oxygen and has gages showing readings of 70°C and 25 bars. Calculate the amount of oxygen (mass and moles) in the container if the atmospheric pressure is 1