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A 120-V motor has mechanical power output of 2.10 hp. It is 80.0% efficient in converting power that it takes in by electrical transmission into mechanical power.
a) Find the current in the motor.b) Find the energy delivered to the motor by electricaltransmission in 2.50 h of operation.c) If the electric company charges $0.160/kWh, what does it costto run the motor for 2.50 h?
A car goes around a curve on a road that is banked at an angleof 30.0°. What is the radius of the curve
A certain lightbulb has a tungsten filament having a resistance of18 Ω at 25°C and 150 Ω whenhot. Assume R = R0[1 +α(T - T0)] can be usedover the large temperature range here. Find the temperature of the filament when it is hot.
A 1530-kg car is traveling with a speed of15.0 m/s. What is the magnitude of the horizontal net force that isrequired to bring the car to a halt in a distance of 41.0 m?
As you finish listening to your favorite compact disc (CD), the CD in the player slows down to a stop. Assume that the CD spins down with a constant angular acceleration. Part A If the CD rotates clockwise (let's take clockwise rotation as positiv..
A metal sphere hangs from a string and has 4 kg of mass. The sphere has a charge of +2.3 µC. What is the electric force on the metal sphere if the magnitude of the electric field is 106 N/C
when two identical ions are separated by a distance of 2.1times10-10 m the electrostatic force each exerts on the
A college student who was late for his physics class drove through a red traffic light, How fast did he need to drive for a Doppler shift this large
A 56.0 kg cheerleader uses an oil-filled hydraulic lift to hold four 120 kg football players at a height of 0.900m. what is the diameter of the football players' piston
If two adjacent natural frequencies of an organ pipe are determined to be 475 Hz and 575HZ. Calculate the fundamental frequency and the length of the pipe.
A spherical capacitor consists of two concentric spherical metal shells and has a radius a for the outer sphere and b for the inner sphere. Calculate the capacitance.
A wheel has angular acceleration of 3.5 rad/s2 and an inertiaof 11.5 kg per m2. what must be the net torque that is acting on the wheel
What minimum constant acceleration does this need if the aircraft is to be airborne after a takeoff run of 250 m.
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