On a sunny day, the concrete at the side of the pool feels much hotter than the water even though both have received the same thermal energy from the sun. explain fully why the concrete is hotter? (2)

Let v1, v2, w be three linearly independent vectors in r 3 . that is, they do not all lie on the same plane. for each of the following (infinite) set of vectors, carefully sketch it in r 3 , and determine whether or not it is a vector space (i.e., a subspace of r 3 ). explain your reasoning

*drag each tile to the correct location in the sequence* the table shows chronological events in the life of our sun, a medium-sized star. place the missing events into the correct rows of the table.

What is the measurement of how fast an object moves relative to a reference point?