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An airplane is flying through a thundercloud at a height of 2400 m. (Flying at this height is very dangerous because of updrafts, turbulence, and the possibility of electric discharge.) If there are charge concentrations of +40.0 C at a height of 3350 m within the cloud and -40.0 C at a height of 1000 m, what is the electric field at the aircraft?
What is the amplitude of the oscillations . Could you think of a simple method for determining the focal length of a converging lens.
A 3.40 g coin is positioned 16.0 cm from the center of a turntable. The coin has static and kinetic coefficients of friction with the turntable surface of mu_s = 0.720 and mu_k = 0.480. What is maximum angular velocity with which the turntable can sp..
The car has just achieved double its initial velocity when the driver spots a police officer behind him and applies the brakes. The car then slows down, coming to rest at the stoplight ahead.
A 1000-kg car travelling at a speed of 32 m/s skids to a halt on wet concrete where f_k = 0.3. How long are the skid marks.
Two boats start together and race across a 56km wide lake and back. Boat A goes across at 56 km/h and returns at 56km/h. Boat B goes across at 28km/h, and its crew, realize how far behind it is getting.
For a damped oscillator with a mass of 360 g, a spring constant 110 N/m and a damping coefficient of 87.00 g/s, what is the ratio of the amplitude of damped oscillations to the initial amplitude at the end of 28 cycles.
How much work (in joules) is done in moving a charge of 2*10^-6 electrons from positive terminal of the battery to the negative terminal of a 12-Volt battery.
How much energy is given to the cell during this pulse. How many years would it take the earth to move 1.0 mm at this speed.
If both the ring and the rod are warmed together, what temperature must they both reach so that the ring barely slips over the rod.
How fast should the platform move, v_p, for the person to detect a beat frequency of 7.00 Hz ? Take the speed of sound to be 344 m/s. Express your answer numerically in meters per second.
A vertical spring (spring constant = 119 N/m) is mounted on the floor. A 0.390 kg block is placed on top of the spring and pushed down to start it oscillating in simple harmonic motion. The block is not attached to spring.
An inventor claims to have devised a cyclic engine which exchanges heat with reservoirs at 300 K and 540 K, and which can produce 450 J of work per 1000 J of heat extracted from the hot reservoir. Is his claim feasible.
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