In Figure 4.27 four particles form a square of edge length a=5cm and have charges q1=+10nc, q2=-20nc, q3 = +20nc, q4=-10.0nc. In unit-rector notation, what net
electric field do the particles produce at the centre of square?

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Amodel rocket with a mass of 0.212 kg is launched into the air with an initial speed of 84 m/s. how much kinetic energy will the rocket have at a height of 214 m? assume there is no wind resistance. 634 j 303 j

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.