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A merry-go-round starts from rest and reaches the angular speed of 4 rpm in the first two minutes. What would be the angular acceleration of the merry-go-round
A beam of gamma rays from a distant galaxy is observed through two polarizing filters whose transmission axis is at a 45 degree angle relative to each other here on earth. What is the intensity of t
An electric motor is plugged into a standard 120V electrical service. At startup a current of 23.4A is measured. what is the operating current with the new resistor added
115 g of glass beads, originally at a temperature of 75.0 oC, are added to 85.0 g of ethyl alcohol which is at a temperature of -50.0 oC. find the temperature of the mixture when thermal equilibrium
A cold room has walls constructed of 0.24 m brick on the outside, 0.15 m foam insulation in the middle and 1.6 cm of wood on the inside. Calculate the outside and inside surface temperature of the co
An object is launched with an initial velocity of 8.0 m/s to the horizontal from 327cm above the ground level. What is the final speed of the object
A car moves with an initial velocity of 5m/s and is subjected to a deceleration of 3m/s2 for 2 seconds. Calculate the distance the car traveled
A telescope mirror has a radius of curvature of 18.0 m. What is the diameter of the image of the Moon produced by this mirror
A converging lens and a diverging lens, separated by a distance of 20.5 cm, are used in combination. What is the focal length of the diverging lens
WThe vertical displacement of particles in a string (when a wave is propagating through it) is given by y = (0.02) sin[(10?)t %u2013 (8?)x]
Two of Angie's friends are talking to each other at a distance of 3.0 m from where Angie stands. What sound intensity does he measure for the two talkers
A current-carrying wire of length 0.5m is at the Equator. Assuming that the magnetic field of the Earth has magnitude of 5 x 10^-5 T, what current is required to allow the wire to be suspended
An electron moves in a circular path perpendicular to a magnetic field of magnitude 0.270 T. find the speed of the electron and the radius of the circular path
A transformer has a primary coil with 1200 turns and a secondary coil with 225.0 turns. what is the voltage output from the secondary coil
Consider a series circuit with the following elements: a 255 ohms resistor, a 50.0 mu/F capacitor, and a 107 mH inductor. What is the inductor%u2019s reactance Xl
Suppose V rms = 240 V for an alternating current power source. What is the amplitude of the voltage for the source
Suppose V max = 120 V for an alternating current power source. What is the rms voltage for the source
Write the general equation of Magnetic force on a current carrying wire of length L in a magnetic field B such that the magnetic field and the current direction make an angle different than 0^0 and
In a model AC generator, a 503 turn rectangular coil 5.0 cm by 21 cm rotates at 120 rev/min in a uniform magnetic field of 0.59 T. What is the maximum emf induced in the coil
What is the ph of a buffer that results when .40 mol nahco2 is mixed with 100 ml of 2.0 m hcl and diluted with water to 250 ml
Two moles of an ideal monoatomic gas undergo a cyclic process starting from state A at a vol. of 1L and a pressure of 2 atm. Find the total work done by the gas in one cycle
A 2.00 kg. frictionless block is attached to an ideal spring with force constant 300 n/m. At t=0 the block has velocity -4.0 m/s, what is the position of the block when its speed is 2.5 m/s
Calculate the inductance of a solenoid with 275 turns if the length of the solenoid is 30 cm and its radius is 2.5 cm
Two blocks connected by a massless rope are placed on an inclined plane as pictured on the right. What is the relationship between the two masses in order for the system to not move
A real 90 v battery (one with internal resistance) has a terminal voltage of 80 v when a motor with a resistance of 8 omega is connected to it. how large is the batterys internal resistance