Tutor profile: Harish N.
Subject: Physics (Electricity and Magnetism)
if two resistors are connected in parallel and each has 4Ω resistance. find total resistance and power if the voltage across the resistor is 10V.
total resistance in parallel connection is 1/Rt= 1/4Ω +1/4Ω thus Rt = 2Ω now power P=VI but we need I so V=IR I=V/R so I= 10V/4Ω I=2.5A power P = 10V * 2.5A => 25 watts power= 25 watts
in a triangle, if angle a =110° and b=20° then find the third angle c.
In a Euclidean space, the sum of measures of these three angles of any triangle is invariably equal to the straight angle, also expressed as 180° thus a+b+c = 180° thus 110° + 20° + c =180° thus c= 50°
2(2 − x) = 3y − 2 3x + 9 = 4(5 − y)
3x + 9 = 20 − 4y Subtract 9 from both sides. 3x + 9 − 9 = 20 − 9 − 4y Combine like terms on each side. 3x = 11 − 4y Divide both sides by 3 x = (11 -4y)/3 Substitute the value of x into the second equation and solve for y 4-2x=3y-2 replace x with above value 4 -2((11-4y)/3) = 3y-2 then simplify it to by taking lcm and multiplying values 12 − (22 − 8y) = 9y − 6 then assemble the same one on a side −10 + 8y = 9y − 6 then y= -4 now use it to get x from the first x value x=(11- 4*-4)/3 x=27/3 x=9
needs and Harish will reply soon.