A base ball Gas a mass of about 0.2kg A, if the velocity of a ptched ball is 30m/s and after being
batted it is 50m/s in the opposite direction Find the
momentum of the ball and Impulse of the blow-
B. If the ball remains in contact with the bat for
0.002 sec. Find the average force of the blow​

What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.