1. Two forces act on a parachutist during a drop. One force is the weight W(500N) of the parachutist. The other force is the upwards pull P(400N) from the parachute harness on the parachutist. The parachutist has a mass of 50 kg.
a. What is the size of the unbalanced force acting on the parachutist?
b. What is the acceleration of the parachutist?
1. A boat engine produces a force of 10000 N and the friction and water resistance total 3500 N. If the mass of the boat is 2000 kg, what will be its acceleration?
"1."
"\\vec F_1=500;\\vec F_2=400;m = 50"
"a)\\vec F =\\vec F_1+\\vec F_2=500-400 =100"
"b)\\vec F= m\\vec a"
"\\vec a = \\frac{\\vec F}{m}=\\frac{100}{50}=2"
"\\text {Answer:}\\vec F=100N;\\vec a = 2\\frac{m}{s^2};"
"2."
"\\vec F_1=10000;\\vec F_2=3500;m = 2000"
"\\vec F =\\vec F_1+\\vec F_2=10000-3500=6500"
"\\vec F= m\\vec a"
"\\vec a = \\frac{\\vec F}{m}=\\frac{6500}{2000}=3.25"
"\\text {Answer: }\\vec a = 3.25\\frac{m}{s^2};"
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