If the boy is floating in the pool, the forces acting on him are balanced. Compare the sizes and directions of the arrows in each picture representing forces acting on the boy. Which of the following diagrams shows that the forces acting on the boy in the pool are balanced? A boy floating in the pool on an tube in four different quadrants. In Quadrant A, there are two black arrows pointing down that are the same size. In Quadrant B, the black arrow pointing down is bigger than the black arrow pointing up. In Quadrant C, the black arrow pointing up is bigger than the black arrow pointing down. And in Quadrant D, the black arrow pointing up is the same size as the black arrow pointing down.

A
B
C
D

Clothing made of several thin layers of fabric with trapped air in between, often called ski clothing, is commonly used in cold climates because it is light, fashionable, and a very effective thermal insulator. so it is no surprise that such clothing has largely replaced thickand heavy old-fashioned coats. (a) consider a jacket made of five layers of 0.1-mm-thick synthetic fabric (k = 0.13 w/m·°c) with 1.5-mm-thick air space (k = 0.026 w/m·°c) between the layers. assuming the inner surface temperature of the jacket to be 28°c and the surface area to be 1.25 m2, determine the rate of heat loss through the jacket when the temperature of the outdoors is 0°c and the heat transfer coefficient at the outer surface is 25 w/m2·°c. (b) what would your response be if the jacket is made of a single layer of 0.5-mm-thick synthetic fabric? what should be the thickness of a wool fabric (k = 0.035 w/m·°c) if the person is to achieve the same level of thermal comfort wearing a thick wool coat instead of a five-layer ski jacket?

In an experiment, how can i change human errors? be specific.

Ateacher gives students four liquids commonly found in the kitchen - vinegar, apple juice, dish detergent, and milk - and ph indicator strips, which measure acidity. the teacher asks the students to put the liquids in order from most acidic to most basic. what type of investigation could the students conduct to determine the correct order for the liquids?