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If Jessica weighs 45kg and sits on a seesaw at a distance of 2m from the centre of the seesaw.Micheal weighs 90kg. At what point on the opposite side should Micheal sit in order to balance the seesaw.

Micheal should sit at a distance of 1m from the pivot or half whatever distance Jessica sits. This is found intuitively here but can be found with any two masses by resolving moments.
HP
Answered by Hugh P. • Physics tutor
1796 Views

Explain dynamic equilibrium?

As reactants react products are made, which increases the concentration of the products. As we know, the higher the concentration the faster the rate of reaction. The forward reaction (the reaction of the re...
JW
Answered by Josh W. • Chemistry tutor
2669 Views

Solve the simultaneous equations 1) 3x + 2y = 4 & 2) 4x + 5y = 17

Find the lowest common denominator of either x or y. x in this example. ( 12x ) Multiply both equations such that the x's match this. ( 1) 12x + 8y = 16 & 2) 12x + 15y = 51 ) Combine these formulas by ta...
RT
Answered by Robert T. • Maths tutor
2872 Views

y = x^2 + 4x + 7 Find the turning point of the equation by completing the square.

Should start completing the square by figuring out what the square will be ( (x + 2) 2 ) Figure out what should be added/taken away from the square to complete it by multiplying out ( (x + 2) 2 + 3 ) Correct...
RT
Answered by Robert T. • Maths tutor
6912 Views

How to calculate conditional probabilities? E.g, say we roll a fair standard six sided die, what is the probability we rolled a 2, given that the roll is even?

Brief overiew of the answer: Since the roll is even, we either rolled a 2, a 4 or a 6, all with equal probabilities. Therefore, the probability we rolled a 2 is equal to 1/3.Formal answer: We write P(2|E) to...
KB
Answered by Karlo B. • Maths tutor
6385 Views