Two groups of students were tested to compare their speed working math problems. Each group was given the same problems. One group with calculators, the other group computed without calculators. What is the independent variable, the dependent variable, the control variable, and constant variable?

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

A155.0 9 piece of copper at 182 °c is dropped into 2500 g of water at 23.9 °c. (the specific heat of copper is 0.385 1/9°c.) calculate the final temperature of the mixture. (assume no heat loss to the surroundings.)

When carbon disulfide is formed from its elements, heat is absorbed. calculate the amount of heat in (kj) absorbed when 5.66g of carbon disulfide is formed