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Two copper wires have equal cross- sectionel area and length of 2.0m and 0.50m respectively.
(a) What is the ratio of the current in the shorter wire to that in the longer wire if they are connected to the same power supply?
(b) If you wanted the two wire to carry the same current, what would the ratio of their cross - sectional areas has to be?(Give your answer as a ratio of longer to shorter)
A physicist has developed a device that generates a beam of alpha particles (each of which is a helium nucleus, consisting of two protons, two neutrons, and no electrons).
You have a string with a mass of 0.0131 kg. You stretch the string with a force of 9.31 N, giving it a length of 1.89 m, What is the wavelength of the standing wave you create in the string
A 220 cm length of string has a mass of 1.9 g. It is stretched with a tension of 7.1 N between fixed supports. What is the wave speed for this string? What is the lowest resonant frequency of this string?
A hydrogen atom initially in the n =3 level emits a photon and ends up in the ground state. What is the energy of the emitted photon? If this atom then absorbs a second photon and returns to the n =3,state what must the energy of this photon be?
A longitudinal wave travels on a slinky or any long spring. The wave is represented by the equation x(x, t) = 2.10 cm cos(2000 rad/s t + 40.0 m-1x)
A small 0.280-kg object moves on a frictionless horizontal table in a circular path of radius 4.30 m. The angular speed is 8.02 rad/s.what is the radius of the smallest possible circle on which the object can move
What is the total resistance of the circuit below?
In a model AC generator, a 499 turnrectangular coil 5.0 cm by 28 cm rotates at 115 rev/minin a uniform magnetic field of 0.62 T. What is the maximum emf induced in the coil?
A small, 100g cart is moving at 1.70m/s on an air track when it collides with a larger, 3.00kg cart at rest. what is the speed of the large cart after the collision
A 14.8cm diameter loop of wire is initially oriented perpendicular to a 1.3T magnetic field, What is the average induced emf in the loop
The New England Merchants Bank Building in Boston is 152 m high. What is the total distance, side to side, that the top of the building moves during such an oscillation
A seed shoots out from the pod with the speed of 2.8 m/s but with a direction of motion 30° below the horizontal. What horizontal distance does it cover during its flight
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