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A test of a driver’s perception/reaction time is being conducted on a special testing track with wet pavement and a driving speed of 55 mph. When the driver is sober, a stop can be made just in time to avoid hitting an object that is first visible 520 ft ahead . After a few drinks under exactly the same conditions, the driver fails to stop in time and strikes the object at ta speed of 35 mph. Determine the drivers perception/reaction time before and after drinking (assume practical stopping sight distance).
calculate the amplitude F0 of the sinusoidal excitation force that is necessary to produce a steady-state vibration with a velocity amplitude of 10 m/s at resonance
The sign is attached to the post that is built-in at the ground. Treat the sign as having uniform mass. Neglect the contribution of the post weight. The length d is from the center plane of the sign to the center of the post.
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 flow in the period
Given that that there is no budget to built any type of artificial protection enclosure or retention wall but you still have some allowance for using earthmoving equipment, which of the techniques discussed in class would appropriate in case slope pr..
the bailey stone works employs six people. assumming that the density of uncompacted waste is 480 kg/m^3, determine the annual volume of solid waste produce by the stone works assumming a waste generation rate of 1 kg/cap*d.
Calculate the acceleration in meters per secondsquared and compare to the value of the gravitational accelerationnear the Earth's surface (9.8 m/s^2)
Determine the percent error n in replacing the sine and the tangent of an angle by the value of the angle in radians for angle values 5 degrees, 10 degrees, and 20 degrees. Explain the qualitative difference between the sine and tangent results
582 nm photons are used in a photoelectric experiment. An electron is just released from metal with little or no kinetic energy at this frequency. What is the work function for this metal
If vehicles are processed at a uniform deterministic rate of six per minute, determine when the queue will dissipate, the total delay, the maximum queue length (in vehicles), the longest vehicle delay under FIFO, and the longest vehicle delay unde..
Estimate the amount of Ca(OH)2(s) leached from concrete during a one-year period by precipitation. Assume that the area receives 40 in/yr of precipitation which is in equilibrium with PCO2= 10^-3.5 atm and [SO42-] = 10^-4 M
A container containing saturated soils weighs 113.27 g before being placed in an oven and 100.06 g after drying remains in the same container overnight. The empty container weighs 49.31 g and relative density of the grains is 2.80.
Calculate the pressure, and the piezometric head at the free surface, at both interfaces, and at the tank bottom. Take the elevation datum at the bottom of the tank.
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