Al deslizar un bloque de madera de 50 kg sobre una superficie horizontal aparece una fuerza de fricción entre las superficies de 98.1 N. ¿Hallar el valor del coeficiente de fricción? *

a) cold, dry

explanation:

continental polar masses are cold and dry air masses because the cold air cannot hold much moisture. as they move into warmer air, they can trigger precipitation.

a.) is the correct answer.

explanation:

current flows in a wire

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.