Two vectors act at right angles to each other. If the magnitude of one of the vector is 16 meters and the resultant of the two vectors has magnitude 20 meters, what is the magnitude of the other vector, to the nearest meter? A.36 meters
B. 4 meters
C. 50 meters
D. 12 meters

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?

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.