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A 120-V motor has mechanical power output of 2.50 hp. It is 90% 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 electrical transmission in 3.00 hrs of operation.
A 6.90-g lead bullet traveling at 420 m/s is stopped by a large tree. what is the increase in temperature of the bullet
A thick, conducting, spherical shell of inner radiusa = 0.7 cm and outer radius b = 1.3 cm is uncharged. The shell surrounds a point charge +Q = 3.10×10-3 C at itscenter (see the figure). What is the surface charge residing on the inner surface oft..
The deflection plates in an oscilloscope are 10 cm by 2 cm with a gap distance of 1 mm. A 100 volt potential difference is suddenly applied to the initially uncharged plates through a 950 ohm resistor in series with the deflection plates.
What is the new acceleration of box
an icy planet at some mass M and radius R is spinning at some velocity W the ice melts into space at the constant rate of K (masses/sec), at what rate is the velocity changing
A 0.138-A current is charging a capacitor that has square plates 5.20 cm on each side. The plate separation is 4.00 mm. Find the displacement current between the plates
A 2.00-nF capacitor with an initial charge of 5.06 µC is discharged through a 1.28-k? resistor. What is the maximum current in the resistor
You are standing on a sheet of ice that covers the football stadium parking lot in Buffalo; there is negligible friction between your feet and the ice. If you catch the ball, with what speed do you and the ball move afterwards
A rocket fires two engines simultaneously. One produces a thrust of 760N directly forward while the other gives a thrust of 517N at an angle 39.6 above the forward direction
A vertical scale on a spring balance reads from 0 to 225. The scale has the length of 11.5 from the 0 to 225 reading. A fish hanging from the bottom of the spring oscillates perpendicularly at a frequency of 3. Ignore the mass of the spring, what ..
Imagine a Hydrogen atom to consist of a single proton as a nucleus and a single electron, which orbits the proton in a circular path. then what will be the radius of the orbit when it has lost half of its original kinetic energy
A railroad car with a mass of 2.46 x 10^4 kg moving at 3.25 m/s collides and joins with two railroad cars already joined together, each with the similar mass as the single car and initially moving in the same direction at 1.49 m/s.
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