Atub containing 53 kg of water is placed in a farmer's canning cellar, initially at 10∘c. on a cold evening the cellar loses thermal energy through the walls at a rate of 1200 j/s. without the tub of water, the fruit would freeze in 4 h (the fruit freezes at −1∘c because the sugar in the fruit lowers the freezing temperature). part a by what time interval does the presence of the water delay the freezing of the fruit? the specific heat of water is c = 4180 j/kg⋅∘c.

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?