John and Barry are pulling on a fence post with ropes while their friend Pat uses a chain-saw to shear it at ground level. John applies a force of 75.0 N [40 degrees] on one rope while Barry applies a fore of 85.0 N [340 degrees] on the other rope. What is the net force on the post?

The energy released by a chemical reaction can be measured using a calorimeter. when barium hydroxide octahydrate crystals are reacted with dry ammonium chloride inside of a coffee cup calorimeter, the temperature of the 18.00 g of water in the calorimeter decreases from 30.0°c to 8.0°c. the equation for calculating energy absorbed or released by a reaction is: where q is the energy released or absorbed, m is the mass of water in the calorimeter, cp is the specific heat of water, and δt is the observed temperature change. if the specific heat of liquid water is 4.19 j/g·°c, how much energy was absorbed by the reaction?

Which is not one of the major climate zones? question 3 options: rain forest polar tropical temperate

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?