Electric Circuits Answers

a 60 ohm resistor in parallel with a resistor of unknown value when 120V is applied to the circuit the current is 3A.Calculate a) unknown resistance b) total equivalent resistance

what is the effect of rise in temperature on conductivity of copper and silicon

12 volts is applied across a 4 ohm resistor. How much power is dissipated by the resistor?

An object is thrown upward from the edge of a tall building with a velocity of 10 m/s. Where will the object be 3 s after it is thrown? Take g = 10ms^{-2}
15 m above the top of the building
30 m below the top of the building
15 m below the top of the building
30 m above the building

2 A stone thrown from ground level returns to the same level 4 s after. With what speed was the stone thrown? Take g = 10ms^{-2}
20 m/s
10 m/s
30 m/s
15 m/s

3 What is common to the variation in the range and the height of a projectile?
horizontal velocity
time of flight vertical velocity, horizontal acceleration
vertical velocity
horizontal acceleration

4 A cart is moving horizontally along a straight line with constant speed of 30 m/s. A projectile is fired from the moving cart in such a way that it will return to the cart after the cart has moved 80 m. At what speed (relative to the cart) and at what angle (to the horizontal) must the projectile be fired?
35.8 m/s at 24 degrees
38.6 m/s at 54 degrees
27 m/s at 35 degrees
2

A platinum resistance thermometer has a resistance of 4 ohms at 0 degree celsius and 10 ohms at 100 degree celsius calculate the resistance of the thermometer when the temperature is 45 degree celsius

two identical conducting sphere are fixe in a place attract each other with force of 0.109N seperated by 50 cm (center to Center)the sphere are connected by a thin wire . When wire is removed, the sphere attrect each other with a force of 0.0360 . What are initial charge on spreres?

There is a net passage of 5.2 1018 electrons by a point in a wire conductor in 0.22 s. What is the current in the wire?