Answer:Science is the body of knowledge that explores the physical and natural world. Engineering is the application of knowledge in order to design, build and maintain a product or a process
Explanation:
Answer:
D Reflection
Explanation:
It reflects the light from the sun. Then when the earth gets in the way, it casts a shadow causing crescent moons.
Answer:
Velocity of ball B after impact is and ball A is
Explanation:
= Initial velocity of ball A
= Initial velocity of ball B = 0
= Final velocity of ball A
= Final velocity of ball B
= Coefficient of restitution = 0.8
From the conservation of momentum along the normal we have
Coefficient of restitution is given by
Adding the above two equations we get
From the conservation of momentum along the plane of contact we have
Velocity of ball B after impact is and ball A is .
Answer:
Corps regulators now send threatening letters to farmers who switch from one crop to another, such as rice to orchards, or perform routine plowing.
Explanation:
The Corps says the farmers can be performing a “land-use” change that suddenly puts a farm under Corps jurisdiction. It is getting harder and harder, and in legal terms more dangerous, to be an American farmer these days, thanks to the aggressive behavior of the federal Environmental Protection Agency (EPA) and the U.S. Army Corps of Engineers. Increasingly, those regulations are changing at the arbitrary say-so of the Corps regulators who implement the EPA’s regulations on the ground, even though most practices followed by American farmers have been exempted from CWA prohibitions since it was written in 1977.
Answer:
upper bound = 20.4 GPa
lower bound = 3.71 GPa
Explanation:
Given data:
20% of BN ( Vb )
80% of AI ( Va )
Elastic modulus of AI ( Eai ) = 69 GPa
Elastic modulus of BN ( Ebn ) = 90 GPa
lets assume the Modulus of the composite to be 3GPa ( value not given in question ) ( Em )
Calculate the upper bound of the elastic modulus
upper bound = Em*Va + Ebn * Vb
= 3 * 0.8 + 90 * 0.2
= 2.4 + 18 = 20.4 GPa
lower bound =
= ( 3 * 69 ) / [ (0.8 * 69 ) + ( 0.2 * 3 ) ]
= 207 / 55.8 = 3.71 GPa