A point charge Q is placed on the x axis at x = 2.0 m. A second point charge, − Q, is placed at x = 3.0 m. If Q = 40 μC, what is the magnitude of the electrostatic force on a 30- μC charge placed at the origin?

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.

The voltmeter reads 117 v and ammeter reads 0.13 a .if the resistance of ammeter and voltmeter are 9 kilo ohm and 0.015 ohm respectively ,find the value of r. 3marks

You and your friend peter are putting new shingles on a roof pitched at 20 ∘ . you're sitting on the very top of the roof when peter, who is at the edge of the roof directly below you, 5.1 m away, asks you for the box of nails. rather than carry the 2.0 kg box of nails down to peter, you decide to give the box a push and have it slide down to him.