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Ann and Bob play on a uniform seesaw. The seesaw is 4m long and Ann and Bob weigh 600N and 800N respectively. If both Ann and Bob start at one end of the seesaw and Bob starts to walk up the seesaw at 2m/s, after how long will the seesaw turn?

(expect a diagram of a uniform seesaw with a pivot in the middle, infered from the question) For the seesaw to turn, Bob must create a greater Moment than Ann. Moment = Force * Perpedicular distance to pivot...
AS
Answered by Angus S. • Physics tutor
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(Much Ado About Nothing) How does Benedick change over the course of the play?

Introduction: Benedick begins Much Ado About Nothing as a sarcastic, uncaring individual but by the end of the play is genuine and heartfelt in the way he carries himself. Briefly go over points that will be...
MR
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25.00cm3 of sodium hydroxide was pipetted into a conical flask. It was titrated against 0.10mol/dm3 hydrochloric acid. The mean volume of acid needed was 24.00cm3. Calculate the concentration of sodium hydroxide used in the titration.

First write out the chemical equation: ​​​​​​ HCl + NaOH -> NaCl + H 2 0 Next construct a table with the information we have and in what units. Next write out what calculation triangle we need: Number of ...
MB
Answered by Matthew B. • Chemistry tutor
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Amy has cystic fibrosis which is caused by a recessive allele. Her partner is heterozygous for cystic fibrosis. What is the chance that her future child has cystic fibrosis?

Alleles are different forms of a gene which can become mutated to cause different characteristics or diseases. They can be dominant (usually denonimated by a captial letter H) or recessive (usually denominat...
RM
Answered by Rebecca M. • Biology tutor
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How do you expand (2x+9)^2?

(2x+9) 2 = (2x+9)(2x+9) Use FOIL to expand these brackets: First - ( 2x +9)( 2x +9) --> 4x 2 Outside - ( 2x +9)(2x+ 9 ) --> 4x 2 + 18x Inside - (2x +9 )( 2x +9) --> 4x 2 + 18x + 18x Last - (2x +9 )(...
AM
Answered by Alec M. • Maths tutor
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