Physics Answers

The current through a circuit, in which emf of a cell ε = 120V and internal

resistance r = 0.01Ω is connected with load R= 1000Ω, is:

A runner goes north 500 m, turns east 1050 m and then goes south for 800 m.  

             What is his displacement relative to his starting point? 

A uniform meterstick is supported at the 50 cm mark. A 25N weight is placed at the 10 cm mark. Where should a 200N weight be placed for the meterstick to be in equilibrium?

A system takes in 0.550 KJ of heat while it does 0.770KJ of work on the surrounding. What is the change in internal energy of the system?

1.0 mol of an ideal gas starts at 1.0 atm and 77°F and does 1 KJ of work during an adiabatic expansion. Calculate the final volume of the gas express your answer in litres.

What is the force of gravity between two sacks of rice and corn with a masses of 50.0 kg and 68.0 kg separately by 15.0 m?

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An electrically neutral metallic solid undergoes induction after which it loses l0'electrons. What is

the total charge on the metallic solid?

The furnace wall consists of 200m of fire brick and 115m insulating brick having thermal conductivity of 0.7m and 25w/m² respectively. Calculate the heat transfer per metre square of the furnace wall when the temperature difference across the slab is 500°C

If A=6i-8j , B=8i+3j and C=26i+19j determine a and b so that aA+bB+C=0

The vector is given by R=3i+4j-5k find the magnitude of the xy component and the angle between R and xy axis