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Questions (5)
a bottle has mass 81.509g when empty. a bottle with pure water has mass 610.5g (density=1.00g/mL). a bottle with isopropanol has
0 answers
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calculate the # of oxygen atoms in 30 grams of CaSO4
#O atoms= 4 times the moles of CaSO4 * avagradoo's number. How many moles of
0 answers
581 views
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.
1 answer
2,151 views
2Na3PO4 + 3CaCl2 ----> Ca3 (PO4)2 + 6NaCl
how many moles of CaCl2 remain if .10 mol Na3PO4 and .40 mol CaCl2 are used? When
2 answers
6,269 views
has anyone taken a chemistry placement exam prior to their 1st year of college? what's it like?
look up chemistry placement exam
0 answers
712 views
Answers (32)
By the sine law, we know that sin(
D. congruent diagonals
It's A. y = 4x – 25
A. dramatic
2 is B. dramatic
A. He says he has “little superstition.”
C. He says men know the difference between “temper” and “principle.”
A. distribute resources efficiently.
C. It means that there are fewer workers available to work in industrial jobs.
C. Group of 20
B. Your cousin gives you a car worth $1,700.
D. taking advantage of minute-by-minute changes in stock prices.
D) The Federal Open Market Committee can act almost immediately.
B. It adds up the value of four groups of final goods and services.
C. to limit the impact of equilibrium pricing
Isn't it Velocity = x/t
some help....anybody???
some help....anybody????
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
the answer for c was posted by KS
Anonymous, I can't solve the problem..... Please some hint.
Greco, alpha is 1.5 m^-1 or I am wrong???
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 ???
please
how can we find t???
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???
alpha is 1.5 m^-1
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
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???
you need to use conservation of momentum and conservation of energy..... v = 2,......
please somebody
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
