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Using Faraday's law of electromagnetic induction and the fact that the magnetic field changes from zero to its maximum value in one-quarter of a wave period, find the magnitude of the average emf in
A piano string has a fundamental frequency of 100 Hz, is 1.0 M long and has a mass of 100 g. What is the tension on the piano string?
(a) Neil A. Armstrong was the first person to walk on the moon. The distance between the earth and the moon is 3.85 × 108 m. Find the time it took for his voice to reach the earth via radio wave
When the search coil (inductor B) is brought near a buried metal object, a beat frequency of 8.6 kHz is heard. By what percentage does the buried object reduce the inductance of the search coil?
If the antenna is intended to broadcast radio signals ranging in frequency from 3.0 MHz to 9.6 MHz, find the (a) minimum and (b) maximum inductance of the tank circuit.
The femoral artery is the large artery that carries blood to the leg. A person's femoral artery has an inner diameter of 1.2cm. What is the resistance of a17-cm-long column of blood in this artery?
A spring that has a force constant of 1150 N/m is mounted vertically on the ground. A block of mass 1.50 kg is dropped from rest from height of 1.45 m above the free end of the spring. By what dista
A 72 mm focal-length lens is used to focus an image on the film of a camera. The maximum distance allowed between the lens and the film plane is 120 mm. How far ahead of the film should the lens be
If the boat heads due north to the Earth, determine the velocity of the boat relative to an observer standing on either bank.
If a second capacitor of capacitance 2C is connected in series to the first, the time constant of the new RC circuit will be:
A heat engine takes in 150 kJ of energy from a source at 740 K and expels 50 kJ to a reservoir at 300 K. Calculate the ideal efficiency and the actual efficiency of the engine.
The cabin is located 3ydsabove the lake. Please find the change in kinetic and potential energy of the stream in J/min.
What was the speed of the bullet before impact if the two objects move together after impact?
What would be the weight of the spherical mass at that location? Give your answer in the form "a.bc x 10^(y)" N.
A grinding wheel is in the form of a uniform solid disk of radius 6.99 cm and mass 1.97 kg. It starts from rest and accelerates uniformly under the action of the constant torque of 0.609 N ·
A potter's wheel-a thick stone disk of radius 0.500 m and mass 125 kg-is freely rotating at 50.0 rev/min. The potter can stop the wheel in 6.00 s by pressing a wet rag against the rim and exerting a
Two converging lenses, each of focal length 15.2cm, are placed 40.9 cm apart, and an object is placed 30.0 cm in front of the first lens. Where is the final image formed? What is the magnification o
A man standing 1.56 m in front of a shaving mirror produces an inverted image 17.6 cm in front of it. How close to the mirror should he stand if he wants to form an upright image of his chin that i
If the spheres are initially at rest and just touching, how much energy is required to separate them to 1.08 m apart? Assume that the only force acting on each mass is the gravitational force due to
The two blocks undergo a perfectly inelastic collision. What should the velocity of the red block be in order to have the two blocks move to the left with a speed of 0.56 after the collision?
A 1041 kg van, stopped at a traffic light, is hit directly in the rear by a 744 kg car traveling with a velocity of +2.00 m/s. Assume that the transmission of the van is in neutral, the brakes are n
If a proton is moving in a magnetic field with a speed of 4 × 106 m/s and is executing uniform circular motion with a radius of 10 cm, what is the magnetic field?
An electron with a velocity of v= (3x+ 4y+ 2z) × 106 m/s enters a region where there is both a magnetic field and an electric field. The magnetic field is B = (1x- 2y+ 4z)T. If the electron e
What is the acceleratin of the box? What was the total work done on the box? What is the final velocity? ( use work-energy theorem)