Numerical problems Solve the following numerical problems:
A box weight 900 N and its base is a square of side 2m. What pressure
does the block exert on the ground.
The weight of a box is 300 kg. The lower surface area is 150 square meter.
What is the pressure exerted by the box? (g = 10m/s)
b.
(Ans. 255 Pa]
(Ans. 20 N/m or 20 Pa]
A 5m x 4m x 3m tank is filled with water. What pressure is exerted by
at its buttom
(Given; density of water = 1000 kg/m3 and g = 100m/s)
30000(P
Calculate the pressure exerted by a liquid at 4m if its density is 700kg/

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?

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.