12. A car is driven 15 kilometres East for 12 minutes before the road changes. The car is then driven 18 kilometres South for 18 minutes.
(a) Calculate the average speed of the car, kilometres per hour (kmh ').
(b) Calculate the average velocity of the car, in kilometres per hour (kmh-).
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Simple machines can a. increase force only b. decrease force only c. increase or decrease force

When conducting an investigation to determine which type of fertilizer produces the most flowers on a plant, which variable would be graphed on the x-axis once you collected the data? a. type of fertilizer b. amount of flowers c. amount of water d. number of days that the plants grew

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.