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A dry cell when short-circuited will furnish about 30 amp for a brief time. If its emf is 1.5 v, calculate what is its internal resistance?
An ordinary household electric lamp takes about 1 amp will it be safe to connect it directly to the dry cell? Why?
A ball of mass 0.200 kg has a velocity of 1.58 m/s; a ball of mass 0.310 kg has a velocity of -0.405 m/s.They meet in a head-on elastic collision. Find the velocity of their center of mass before and after the collision
In the bohr model of the hydrogen atom an electron (mass 9.1*10^-31kg) orbits a proton at a distance of 5.3*10^-11 m. The protonpulls on the electron with an electrical force of 8.2*10^-8 N. How many revolutions per second does the electron make?
A certain substance has a mass per mole of 42 g/mol. When 313 Jis added as heat to a 25.0 g sample ofthis material, How many moles of the substance are present
a baseball is thrown by the center fielder from shoulder level to home plate where it is caught on the fly at an equal
a transverse wave traveling on a string is represented by yx 0.48cos5.6x84t. yx is measured in cm above or below
A wooden block is pulled 12 m across a frictionless surface using a rope. What angle does the rope make with the horizontal
calculate the inductance si units henries of a coil of wire having a loop diameter of 0.5 cm and length of 1 cm. the
The wire is located in a uniform magnetic field B directed perpendicular to the wire. Compute the magnitude of B when the force on the wire due to B is 0.200 N.
If the hour and minute hands of an analog clock are aligned at 00:00 (midnight), at what time will they next realign
two objects are connected by a light string that passes over a frictionless pully, find the magnitude of the acceleration of the suspended block as it falls
The boiling point of water increases with depth because pressure increases with depth. at what depth will fresh water have a boiling point of 150 degree celcius if the surface of water is at sea level
What is the magnitude of the auto's average acceleration.
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