How might a weather scientist feel about the market for helium filled balloons

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

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.

The receptor cells that convert light energy into neural signals are called