#21 a 0.30 kg softball has a velocity of 15 m/s at an angel of 35o below the horizontal just before making contact with the bat. what is the magnitude of the change in momentum of the ball while in contact with the bat if the ball leaves with a velocity of (a) 20 m/s, vertically downward, and (b) 20 m/s, horizontally back toward the pitcher?

After much consideration, you have chosen cancun over ft. lauderdale as your spring break destination this year. however, spring break is still months away, and you may reverse this decision. which of the following events would prompt you to reverse this decision? a. the marginal cost of going to cancun decreases.b. the marginal cost of going to ft. lauderdale decreases.c. the marginal benefit of going to cancun increases.d. the marginal benefit of going to ft. lauderdale decreases.

Xinhong company is considering replacing one of its manufacturing machines. the machine has a book value of $39,000 and a remaining useful life of 5 years, at which time its salvage value will be zero. it has a current market value of $49,000. variable manufacturing costs are $33,300 per year for this machine. information on two alternative replacement machines follows. alternative a alternative b cost $ 115,000 $ 117,000 variable manufacturing costs per year 22,900 10,100 1. calculate the total change in net income if alternative a and b is adopted. 2. should xinhong keep or replace its manufacturing machine

Consider an economy where the government's budget is initially balanced. the production function, consumption function and investment function can be represented as follows y equals k to the power of alpha l to the power of 1 minus alpha end exponent c equals c subscript 0 plus b left parenthesis y minus t right parenthesis i equals i subscript 0 minus d r suppose that taxes increase. what happens to the equilibrium level of output?