In a practical, students found that using an electric kettle produced around 2000 J of energy every second. It was left boiling for about 120 s and then turned off. It was found to have lost around 105 g of water. Calculate the specific latent heat of vaporisation for water using the students’ data.

If forces acting on an object are unbalanced, which factors may result fron an unbalanced force? check all that apply

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

A1000-kg weather rocket is launched straight up. the rocket motor provides a constant acceleration for 16-s, then the motor stops. the rocket altitude 20-s after launch is 510-m. you can ignore any effects of air resistance. a. what was the rocket’s acceleration during the first 16-s? b. what is the rocket’s speed as it passes through a cloud 5100-m above the ground?