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The LED will only light up if enough electrical current is flowing through it. The amount of current is given by I = V/R, where V is the potential difference. Why does it only light up when it is pointing in the same direction as the electric field?
a calculate the inductance of a solenoid containing 300 turns if the length of the solenoid is 25.0 cm and its cross
a hummingbird hovers 4.00cm from the surface of a decorative stainless-steel sphere that sits on a pedestal in a garden. make a sketch of the optical system
A person cooks a meal in a 30-cm-diameter pot that is covered with a well-fitting lid and lets the food cool to the room temperature of 20°C. The total mass of the food and the pot is 8 kg.
When a fighter pilot makes a very quick turn, he experiences a centripetal acceleration. What is the minimum radius of curvature that he can take without blacking out
two charges are placed between the plates of a parallel plate capacitor. one charge is q1 and the other is q2 4.50
A ship is expecting to travel to its home port 650 km due East. Before the ship starts to travel, How far is the ship from its home port
A 70kg hiker climbs to the second base camp on Nanga Parbat in Pakistan, at an altitude of 3900m, starting from the first base camp at 2200m. The climb is made in 4.7hr. Calclate the following A)the work done against gravity B) the average power outp..
The intensity of sound wave A is 100 times that of sound wave B. Relative to wave B, find the sound level of wave A
A 1.2-kg mass suspended from a spring of spring constant 22 N.m-1 executes simple harmonic motion of amplitude 5 cm. What is the speed of the mass when the spring is stretched 2.5 cm from its equilibrium position?
A diffraction grating is made up of slits of width = 300 nm with separation = 1150 nm. The grating is illuminated by monchromatic plane waves of wavelength ? = 560 nm at normal incidence. How many maxima are there in the full diffraction pattern? Wha..
An air puck of mass 0.20 kg is tied to a string and allowed to revolve in a circle of radius 0.9 m on a frictionless horizontal table. What is the speed of the puck
One day when you come into physics lab you find several plastic hemispheres floating like boats in a tank of fresh water. Each lab group is challenged to determine the heaviest rock that can be placed in the bottom of a plastic boat without sinkin..
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