What is the noticeable effect of the arrector pili muscle in humans Vasodialation of blood vessels in the dermis causing raised bumps on the skin

Cooler temperatures cause body hairs to flatten against the skin creating noticeable bumps.

Vasoconstriction of blood vessels in the dermis causing noticeable bumps on the skin.

Muscle contraction that causes body hair to stand on end creating "goose bumps

Scout feels ill one day before school. her mother puts a thermometer in her mouth and the temperature begins to climb to 100°f. what is happening between the cooler thermometer and scout's body? a) scout's body is applying a force to the particles in the thermometer. b) kinetic energy is being transferred from her mouth to the thermometer. c) potential energy is being lost by the thermometer and gained by scout's body. d) the potential energy stored in foods is converted to mechanical energy to raise the mercury in the thermometer.

What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal tube for 40 c water to flow through it at an average speed of 4.0 m/s?

What kind of simple machine is a catapult?