When is momentum conserved?
a. it is always conserved.

b. momentum is conserved when the system is closed, which means there are no forces, like friction, acting on it.

c. it is conserved when only two objects collide; more than two objects can't conserve momentum.

d. momentum is never conserved.

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

Write a full page that sumerizes thermodynamics it’s from the website visionlearnig

The second largest public utility in the nation is the sole provider of electricity in 32 counties of southern florida. to meet the monthly demand for electricity in these counties, which is given by the inverse demand function p = 1,200 – 4q, the utility company has set up two electric generating facilities: q1 kilowatts are produced at facility 1, and q2 kilowatts are produced at facility 2 (so q = q1 + q2). the costs of producing electricity at each facility are given by c1(q1) = 8,000 + 6q12 and c2(q2) = 6,000 + 3q22, respectively. determine the profit-maximizing amounts of electricity to produce at the two facilities, the optimal price, and the utility company’s profit