已知甲乙丙皆為正立方體的金屬塊不與水反應其邊長為1 cm 2 cm 3 cm密度分別為2 g/cm3 3 g/cm3 4G/cm3放入一個水桶裝在江水注滿將3塊金屬完全淹沒折尺3塊金屬手作 的福利總和為多少gw 54
36
27
18

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.

Coal contains energy. a. light b. kinetic c. chemical d. mechanical

Farmer a has a deep well and needs a lot of water for her animals and crops. her neighbor, farmer b, has a shallower well. he needs less water than farmer a because his farm is smaller. in years of drought, sometimes farmer b can't get any water from his wells. what can farmer b do to decrease the likelihood of his well running dry?