Calculate the total energy radiated by a star in a period of 8.00 hours, given that the diameter of the star is 90,000 miles, and it is at a temperature of 8000 K. Take emissivity of the surface of the star as 0.94

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 of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

Determine the maximum r-value of the polar equation r =3+3 cos 0