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19. Find the capacitance of the Earth .the radius of the Earth is 6,400 km.By how much will the Earth`s potential chance if it receives a quantity of electricity equal to1C?
The antique projector has a 35 mm wide image at the center of the condenser lens. The focal length of the lens is 10 cm. Specifies the width of the image projected on the screen 10 m away from the projector lens.
The boiler operates on a Carnot heat pump, which is installed between a boiler in which the water is at 60 ° C and a basement in which it is 10 ° C.
(a) What is the efficiency of the heat pump?
(b) The pump heats water with a power of 1 kW. How much electrical power does the pump consume?
(c) When pouring water from a boiler with some flow, cold tap water flows into it. Indicate how you would come to a connection during the maximum flow at which this boiler is still "catching up" by continuously heating the supply water, and during the cold water temperature. If possible, complete this connection and state the meaning of all symbolic quantities used
The plate capacitor is already charged with some charge and disconnected to keep the charge on it. What changes increase the voltage across the capacitor?
• Increase the surface area of the plates
• Reduce the surface area of the plates
• Increase the distance between the plates
• Reduce the distance between the plates
• Insert a dielectric between the plates
One-meter-long coaxial cable is incorrectly connected to the output device, so part of the signal bounces back on the connection. Determines the speed of the signal along the wire if we see echoes in the signal with a delay of 10 ns.
The volume of 2.4 m3 of an ideal gas initially at 0C and pressure 1.013 x 105 Pa is compressed to 1.6 m3 and its temperature remains the same. Calculate the new pressure
Find the potential drop along a copper wire 500 m long and 2 mm in diameter if the current in it is equal to 2 A. Determine the potential drop in resistors. ρ(copper)=1.68×10−8 (Ω·m)Energy of charged capacitor.
. Determine the force (per unit area) which two like-charged infinitely long planes having the same charge surface density of 3 x 10^-8 C/cm2 will repel each other with
a projectile is fired with an initial velocity of 60 m/s upward at an angle of 30 degree to the horizontal from a point 80m above a level plain. what horizontal distance will it cover before it strikes the plain?
A 0.40 mm diameter copper wire carries a current of
3μA. Find the current density and he electron drift density in the wire
