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Resistivity measurements on the leaves of corn plants are a good way to assess stress and overall health. The leaf of a corn plant has a resistance of 2.1MΩ measured between two electrodes placed 20 cm apart along the leaf. The leaf has a width of 2.3cm and is 0.20 mm thick.
What is the resistivity of the leaf tissue?
In proton-beam therapy, a high-energy beam of protons is fired at a tumor, What is the total charge of the protons that must be fired at the tumor to deposit the required energy
A fish hanging from the bottom of the spring oscillates vertically at a frequency of 2.55Hz, Ignoring the mass of the spring, what is the mass m of the fish
What would happen to the gravitational force between Earth and the Sun. A reconnaissance plane flies 600 km away from its base at 240 km/h, then flies back to its base at 320km/h.
What is the height of the power line and the initial speed of the ball?
Two very small spheres, each with a mass m = 1.5 g, are suspended from a common axis by insulating threads of length L= 6.0 cm, What is the magnitude of the unknown charge q
Old MacDonald had a farm, and on that farm he had a gate (see below). The gate is 3m wide and 1.8m high, with hinges attached to the top and bottom. The guy wire makes an angle of 300 with the top of the gate and is tightened by a turn buckle to a..
A proton is initially at rest at a point where the potential is 455V. Sometime later the proton is at a point where the potential is 191V. If no force but the electrostatic force acts on the proton, what is its final kinetic energy.
How much work should Denise do to drag her basket of laundry of mass 6.0 kg a distance of 3.0 m along a floor, if the force she exerts is a constant 50.0 N at an angle of 70.0° with the horizontal.
A 1400kg sports car accelerates from rest to 90m/s in 26.9s . How much work is done on the car by the engine, What is the average power delivered by the engine
An electron starts from rest 5.00 cm from the center of a uniformly charged sphere of radius 4.00 cm. If the sphere carries a total charge of 1.00 x10-9 C, how fast would the electron be moving when it reaches the surface of the sphere.
A speedboat starts from rest and accelerates at +2.32 m/s2 for 6.78 s. At the end of this time, the boat continues for the additional 5.34 s with an acceleration of +0.677 m/s2. Following this, the boat accelerates at -0.686 m/s2 for 8.68 s.
An electrical motor can accelerate a ferris wheel whose moment of inertia is 20,000 kg-m^2 from rest to 10 rev/min in 12 sec. When the motor is turned off, the ferris wheel slows down from 10 to 8 rev/min in 10 sec due to frictional losses.
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