Nyeleti Rachel 2022-06-02
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asked 2020-10-18

Three identical blocks connected by ideal strings are being pulled along a horizontal frictionless surface by a horizontal force F The magnitude of the tension in the string between blocks B and C is T=3.00N. Assume that each block has mass m=0.400kg. 
What is the magnitude F of the force? 
What is the tension in the string between block A and block B?

asked 2021-02-21

A 5.00 kg package slides 1.50 m down a long ramp that is inclined at 12.0 below the horizontal. The coefficient of kinetic friction between the package and the ramp is k =0.310. Calculate 
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asked 2021-02-11

Resolve the force F2 into components acting along the u and v axes and determine the magnitudes of the components.
image

asked 2021-01-02

A space traveler weights 540 N on earth. what will the traveler weigh on another planet whose radius is three times that of earth and whose mass is twice that of earth ?

asked 2022-06-07
Finding the limit of { n = 1 k 1 k 2 + n } k = 1
asked 2021-12-16

Give correct answer when have two random variables, X and Y. X is the value of a fair die, Y is the result of a coin flip, with heads being 1 and tails being 0.
E[X]=k=16k6=72,andE[Y]=12. Thus
E[X]E[Y]=74.
That the expectation of XY is not multiplicative, i.e.: E[X]E[Y] is not necessarily equal to E[XY]. But I'm confused about what E[XY] means in the first place. That is, is E[XY] each possible value of the two events combined, multiplied by the probability that the two events occur?
That is, is E[XY]=12(1)k=16k6+12(0)k=16k6=74? If not, what is it?
Due to a typo the last equation [XY]=12(1)k=16k6+12(0)k=16k6 was evaluated as 72,when I believe it shoud be 74. I'd appreciate it if responders told me whether this is a correct value for E[XY].
That concerned with how to calculate E[XY] in the quickest way possible, but how to interpret what E[XY] means. E[X]E[Y]=E[XY] for independent events doesn't concern me as much as why that is the case, and how to manually evaluate E[XY] in order to prove that indeed E[XY]=E[X]E[Y].

asked 2022-06-20
How to prove this basic fact: ( a ) ( 1 ) = a. How to prove that an additive inverse can be expressed multiplicatively?

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