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Using a Time Domain Reflectometry (TDR) probe (rod length 30 cm) to estimate the soil water content of a wet sandy loam soil. From the waveform we conclude that the two-way travel time of the electromagnetic wave along the rods in the soil is 10 ns (1 ns = 1?10-9 s). Calculate the volumetric wetness of the soil using the Topp and Davis (1985) equations. Approximate eqn is vv=c/(Er)^.5 Dielectric constant from inserting v=2L/t into above eqn. so Er=(ct/2L)^2
An ice cube sliding along the ground at 3 m/s goes off a ramp pointed straight up. What is the speed of the ice cube when it comes down, just before it hits the ground
Consider the Earth and a cloud layer 900 m above the planet to be the plates of a parallel-plate capacitor. what is the maximum charge the cloud can hold
Calculate the work done by the electric field force on an electron when the electron moves from point O, where the potential is -30.0 V, to point F,
A car is traveling at 27 m/s when the driver spots a large pothole in the road a distance 44 m ahead. She immediately applies her brakes. If her acceleration is -9.7 m/s2, does she arrange to stop before reaching the pothole.
Compute the Brewster’s angle and angle of refraction.
A molecule of DNA (deoxyribonucleic acid) is 2.28 µm long, Determine the effective spring constant of the molecule
A 900- kg car collides with a 1300- kg car that was initially at rest at the origin of an x-y coordinate system. What was the initial speed of the lighter car (in km/h)
An 88 kg spacewalking astronaut pushes off a 640kg satellite, exerting a 640N force for the 0.60 s it takes him to straighten his arms.
At Zion National Park a loud shout produces the echo 3.40 s later from a colourful sandstone cliff. How far away is the cliff.
Two sound sources driven in phase by the equal amplifier are d = 4 m apart on the y axis. At a point a very large distance from the y axis, constructive interference is first heard at an angle θ1 = 0.140 rad with the x axis.
A 1.60m cylindrical rod of diameter 0.450cm is connected to a power supply that maintains a constant potential difference of 15.0V across its ends, Find the resistivity and for the material of the rod at 20 ?C
Blood from an animal is placed in a bottle 1.79 m above a 3.20 cm long needle of inside diameter 0.360 mm, What is the viscosity of this blood
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