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The current in a coil changes from 3.1 A to 1.9 A in 0.52 s. If the average emf induced in the coil is 15 mV, what is the self-inductance of the coil?
Bob, of mass m, drops from a tree limb at the same time that Esther, also of mass m, begins her descent down a frictionless slide. If they both start at the same height above the ground, which is true about their kinetic energies as they reach the gr..
For an atom (mythical), there are three possible energy levels between which an electron can jump
A 4.7 e2 kg hot-air balloon takes off from rest at surface of the earth. The nonconservative wind and lift forces take the balloon up, doing +9.70 multiplied by 104J of work on the balloon in the process. At what height above the surface of the ea..
Are there transitions of higher or lower energy that are not seen? How many total transitions are there for hydrogen
What is the ratio of the amplitude of the damped oscillation
To estimate the muzzle speed of a blow dart, fire dart straight up into the air and time how long it takes to come back down. Roughly half of that time is the time for object to decelerate from its initial velocity to motionless. Estimation the in..
A transverse sinusoidal wave on a string has a period T = 45.0 ms and travels in the negative x direction with a speed of 30.0 m/s, What is the maximum transverse speed of the string
The quartz crystal in a digital watch has a frequency of 32.8 kHz. What is its period of oscillation?
A plank 2.00 cm thick and 15.1 cm wide is firmly attached to the railing of a ship by clamps so that the rest of the board extends 2.00 m horizontally over the sea below. find the shear modulus of the wood
An asteroid is discovered heading straight toward Earth at 15km/s. An international team manages to attach a giant rocket engine to the asteroid. The rocket fires for 10 min, after which the asteroid is moving at 29degree to its original path at a..
A helicopter is ascending vertically with a speed of 5.57. At a height of 124 above the Earth, package is dropped from a window. How much time does it take for the package to reach the ground?
A solid sphere and a solid cylinder with the same mass and radius roll down an inclined plane without slipping. Which one will reach the bottom of the incline first. Explain why. Assume friction is negligible for both.
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