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How many photons are emitted during 7.0 s of operation of a red laser pointer? The device outputs 2.5 Watts at a 635 nm wavelength
A high-voltage copper transmission line with a diameter of 2.60 cm and a length of 130 km carries a steady current of 1.03 103 A. what time interval does one electron travel the full length of the l
A 10-turn ideal solenoid has an inductance of 3.5 mH. When the solenoid carries a current of 8.0 A the magnetic flux (in mWb) through each turn is
An ac generator producing 10 V (rms) at 300 rad/s is connected in series with a 25-? resistor, The rms current in the circuit (in mA) is
A 5.60 kg of mass is pressed against a spring with a spring constant of 12500 N/m. how high above the ground does it go before coming to a stop
An ac generator producing 20 V (rms) at 200 rad/s is connected in series with a 50-%uF057 resistor, The rms voltage (in volts) across the capacitor is
A series circuit consists of a 15-%uF057 resistor, a 35-mH inductor, and a 25-%uF06DF capacitor. If the frequency is 100 Hz the power factor is
One hundred turns of insulated copper wire are wrapped around an iron core of cross-sectional area 0.100 m2. find the average current in amperes that flows through the resistor
Two identical launchers fire projectiles with the same initial velocity. One launcher is 3.54m above the ground and fires horizontally. what is the intial velocity of the projectiles
The heating element of a simple heater consists of a 2.2-m-long, 0.65-mm-diameter nichrome wire. calculate the resistivity of nichrome in this situation
A liquid is flowing through a horizontal pipe whose radius is 0.0216 m. What volume flow rate will keep the pressures in the two horizontal pipes the same
A series RCL circuit driven at angular frequency %u03C9 = 505 rad/s has a capacitive reactance XC = 851 %u03A9, What is the total impedance
A ball has a diameter of 3.9 cm and average density of 0.0839 g/cm3. What force is required to hold it completely submerged under water
A space probe is fired as a projectile from the Earth's surface with an initial speed of 1.78 x 10^4 m/s. What will its speed be when it is very far from the Earth
A satellite in Earth orbit has a mass of 91 kg and is at an altitude of 1.97 x 10^6 m. What is the potential energy of the satellite%u2013Earth system
A round pipe of varying diameter carries petroleum from a wellhead to a refinery. What is the volume flow rate of the petroleum along the pipe
A 55.0 kg crate rests on a level floor at a shipping dock. What horizontal pushing force is required to just start the crate moving
Three infinite nonconducting sheets, with uniform positive surface charge densities, sigma, 2sigma, and 3sigma, are arranged to be parallel. What is their order, from left to right
The density of gasoline at 0 degrees celsius is 0.68E3 kg/m^3. What is the density on a hot day when the temperature is 35 degrees celsius
A 1450 N uniform boom is supported by a cable as shown. The boom is pivoted at the bottom, and a 1270 N object hangs from its end. Find the tension in the cable holding up the boom
A metal sphere has a charge of +6.9uc. What is the net charge after 7.6x10^13 electrons have been placed on it
how to convert ac current to dc current? is there any conversion factor? how to select an autotransformer for dc motors
Hello Since a prop-airplane can remain in horizontal flight indefinitely, why then, in the air shows, when the airplane is pointing vertically upward
We're doing a buoyancy lab and this equation is derived using the apparent mass of a sinker, calculate the density of the cylinder of wood
Cell phone sends 1.25ghz magnetic waves. Field vector of the wave has a strength of 24 mv/m and points upward, Which direction does magnetic vector point