D) A metal piece of mass 25 kg at 80°C is dropped into 0.12 kg water at 20°С. Find the final temperature measured. Specific heat of metal is 504 J kg-1 K-1 .

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?

Explain what will happen if decomposers were apsent from a forest ecoysystem.