What is the strength of an electric field that will balance the weight of a 9.0 gg plastic sphere that has been charged to -1.6
1 answer:
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Answer:
Step-by-step explanation:
So basically the equation is (x+2) times (x+6). Use the FOIL method to multiply across like this:
x*x + x*6 + 2*x + 2*6
Combine like terms
x^2 + 8x + 12
Thank me later :)
Normal-travel DATA:
distance = 240 km
rate = x km/h
time = d/r
= 240/x hrs
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Bad weather DATA:
distance = 240 km
rate = (x-20) km/h
time = 240/(x-20) hrs
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Bad time - normal time = 2 hrs
240/(x-20) - 240/x = 2
120/(x-20) - 120/x = 1
120x -120(x-20) = x(x-20)
20 = x^2 -20x
x^2 - 20x - 20 = 0
x = [20 +- sqrt(20^2 - 4*1*-20)]/2
x = [20 +- sqrt(480)]/2
x = [20 +- 4sqrt(30)]/2
x = 10 +- 2sqrt(30)
Remember that dividing by a fraction is the same as multiplying by it's reciprocal. For example x ÷ 2/10 is the same as x * 10/2.
2÷
×-6×5÷
Lets convert all of the division to multiplication by using the reciprocal of the fractions
2×
×-6×5×
Simplify
3*-6*5*-4/3
-18*5*-4/3
-90*-4/3
120
Answer=120
2÷
Lets convert all of the division to multiplication by using the reciprocal of the fractions
2×
Simplify
3*-6*5*-4/3
-18*5*-4/3
-90*-4/3
120
Answer=120