How to find it? Thanks2 AnswersPhysics2 weeks ago
A factory makes a large number of ropes with lengths either 3 m or 5 m. There are four times as many
ropes of length 3 m as there are ropes of length 5 m.
One rope is chosen at random. Find the expectation and variance of its length
The answer for expectation is 3.4 but how to find it?
Thanks1 AnswerMathematics1 month ago
A particle in the string oscillates with an amplitude of 13mm. At time t, the particle has zero displacement
How to calculate ‘total distance moved by the particle from time to time (t+100ms)?
First, I calculate the length of ZX and I get 0.288675m. I choose Z as pivot and apply the equation clockwise moment equal to anti-clockwise moment which is 0.288675 x F cos 30 = 75(0.5) and I get 150N for the answer. However, the answer is 130N. Anyone knows how to solve it?
At a pressure of 2.00 × 107 Pa, 1.00 moles of nitrogen was mixed with 3.00 moles of hydrogen. The final equilibrium mixture formed contained 0.300mol of ammonia.
Calculate the amounts, in mol, of nitrogen gas and hydrogen gas in the equilibrium mixture.
The answers are 0.850 mol for nitrogen gas and 2.55mol for hydrogen gas but I can't get the asnwer.
This is what I had done:
N2 + 3 H2 <--> 2 NH3
NH3...0...........-(-0.3)......... 0.3 mol
Are there any mistakes?
May I know why’s the answer A instead or B or C?1 AnswerPhysics2 months ago
Anyone knows how to calculate?Physics2 months ago
The function g is defined by g(x)=2x-3 for x<=k
State the largest value of k possible for the composition fg to be defined
How to solve this question?
Thanks1 AnswerMathematics2 months ago