Hawk

This page lists questions and answers that were posted by visitors named Hawk.

Questions

The following questions were asked by visitors named Hawk.

2Na3PO4 + 3CaCl2 ----> Ca3 (PO4)2 + 6NaCl how many moles of CaCl2 remain if .10 mol Na3PO4 and .40 mol CaCl2 are used? When amounts of both materials are listed one must worry about which is the limiting reagentalthough the problem seems to suggest that N...

N2 + 3H2 --> 2NH3 how many grams of hydrogen are needed to react with 50 grams of nitrogen? Three moles of H2 per one mole of N2. How many moles of N2 is 50 grams? 1.79 moles is 50 grams. You do these problems in steps. Step 1. Write a balanced chemical e...

Answers

The following answers were posted by visitors named Hawk.

I need to confirm my answer please: For a: First for the theorem W_E: The work is for the friction and for the spring (left side of the eq.) and the energy only for the potential(right side) I obtained: -ux^2/2 - kx^2/2 = -mgh then the x=1,.... For b: I a...

please somebody

you need to use conservation of momentum and conservation of energy..... v = 2,......

for part b, I considered only the conservation of energy.I think that the friction is only for work-energy analysis. But I am not so sure???

I did it in this way: using the theorem W-E for the point x=0,x=x1: kx^2 /2 - mV^2 /2 = -αmgx^2 /2 algebra,resolving for V: V= x*sqrt((αmg + k)/m) We know that V = dx/dt so: dx/x = (sqrt((αmg + k)/m))dt ln x = (sqrt((αmg + k)/m))t reolving for t: t= ln (1...

alpha is 1.5 m^-1

I don't know b. For a) x=1.085 c) The block will move back and reach a second stop somewhere between x=0 and x=x1. are those correct???

how can we find t???

In the equation of P(final), what does ''a'' mean??? Because integrating the first relation, I obtained: P(final) = P(initial)*e^(-Mgz/RT) and what is the value of M ???

Greco, alpha is 1.5 m^-1 or I am wrong???

Anonymous, I can't solve the problem..... Please some hint.

the answer for c was posted by KS

I tried in the next way: first I integrated the relation dT/dz =-α and I obtained: T = -6.5z+288 (T in kelvin) then, integrating this relation: dP/P = -Mg/RT dz I obtained: P(final)=P(initial)*e^((-Mgz)/RT) But here, I don't know which values I must repla...

some help....anybody????

some help....anybody???

Isn't it Velocity = x/t

C. to limit the impact of equilibrium pricing

B. It adds up the value of four groups of final goods and services.

D) The Federal Open Market Committee can act almost immediately.

D. taking advantage of minute-by-minute changes in stock prices.

B. Your cousin gives you a car worth $1,700.

C. It means that there are fewer workers available to work in industrial jobs.

A. distribute resources efficiently.

C. He says men know the difference between “temper” and “principle.”

A. He says he has “little superstition.”

2 is B. dramatic

It's A. y = 4x – 25

D. congruent diagonals

By the sine law, we know that sin(<A)/A is sin(<B)/B which is equal to sin(<C)/C. THEREFORE, sin(<120)/22m = sin(<30)/x We need to isolate x. x= 22m * (sin 30 degrees/sin 120 degrees) x=12.7017059222m Since we have an isosceles triangle, each side is abou...