Two metal plates are a distance of 30cm apart in a vacuum.
A current exists between the two plates consisting of electrons moving at a constant speed of 1.5 × 106 ms–1.
At any instant, there is always just one electron travelling between the plates.
What is the current between the plates?2 AnswersPhysics2 weeks ago
A 0.80 m length of steel wire and a 1.4 m length of brass wire are joined together. The combined wires are suspended from a fixed support and a force of 40N is applied, as shown.
The Young modulus of steel is 2.0 × 1011Pa.
The Young modulus of brass is 1.0 × 1011Pa.
Each wire has a cross-sectional area of 2.4 × 10–6 m2
The wires obey Hooke’s law.
What is the total extension? Ignore the weights of the wires.1 AnswerPhysics3 weeks ago
Why is the answer D instead of C?1 AnswerChemistry4 weeks ago
10 cm3 of ethane is burned in 45 cm3 of oxygen at a pressure of 101kPa and a temperature of 200 °C. Complete combustion takes place.
What is the total volume of gas present when the reaction is complete, measured under the same conditions?
Thanks a lot.1 AnswerChemistry4 weeks ago
How to find it? Thanks2 AnswersPhysics2 months 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 AnswerMathematics2 months 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?1 AnswerChemistry3 months ago
May I know why’s the answer A instead or B or C?