1.A hot air balloon lifts 50 meters vertically into the air and then comes back down. What are the displacement and distance of the balloon’s flight?(1 point) A. The displacement is 50 meters upward and the distance is 100 meters.

B. The displacement is 50 meters downward and the distance is 100 meters.

C. The displacement is zero and the distance is 100 meters.

D. The displacement is 100 meters and the distance is zero.

2. A soccer ball is kicked 8 m north. Then a teammate kicks it 6 m east into the goal. What is the soccer ball’s displacement from where it was first kicked?(1 point)

A.10 m northeast

B.14 m northeast

C.4 m southeast

D.100 m northeast

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

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?

How are series and parallel circuits simililar? both have multiple paths for electrons to travel. both require resistors in their circuits. both require a switch to complete the circuit. both have at least one path for electrons to travel.