A mass of 0.3 kg hangs motionless from a vertical spring whose length is 1.05 m and whose unstretched length is 0.40 m. Next the mass is pulled down to where the spring has a length of 1.30 m and given an initial speed upwards of 1.9 m/s. What is the maximum length of the spring during the motion that follows?
In: Physics
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Question 1 1 pts
Calculate the molarity of 2.45 mol CaCl2 in 0.3 L solution.
| 8.16 M |
| 0.735 M |
| 0.122 M |
| 5.42 M |
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Question 2 1 pts
What are the products of this acid-base reaction: HI(aq) + Ba(OH)2(aq)?
| BaI2 and H2O |
| BaH2 and I(OH)2 |
| BaO and H2O |
| BaI2 and 2OH- |
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Question 3 1 pts
Write the complete ionic equation for: Pb(NO3)2(aq) + 2KCl(aq) -->PbCl2(s) + 2KNO3(aq)
| Pb2+(aq) + 2NO3-(aq) + 2K+(aq) + 2Cl-(aq) -> PbCl2(s) + 2K+(aq) + 2NO3-(aq) |
| Pb2+(aq) + 2NO3-(aq) + 2K+(aq) + 2Cl-(aq) -> Pb2+(aq) + 2NO3-(aq) + 2KCl(aq) |
| Pb2+(aq) + 2NO3-(aq) + 2K+(aq) + 2Cl-(aq) -> Pb2+(aq) + 2Cl-(aq) + 2KNO3-(aq) |
| Pb2+(aq) + 2NO3-(aq) + 2K+(aq) + 2Cl-(aq) -> Pb2+(aq) + 2Cl-(aq) + 2K+(aq) + 2NO3-(aq) |
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Question 4 1 pts
What is the molarity of CO32- in 0.24 M Al2(CO3)3?
| 0.72 M |
| 0.48 |
| 0.24 M |
| 0.08 M |
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Question 5 1 pts
If 430 mL of a 5.5 M glucose solution is diluted to 1500 mL, what is the molarity of the diluted solution?
| 1.58 M |
| 2.0 M |
| 0.13 M |
| 3.2 M |
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Question 6 1 pts
To what volume would you dilute 35 mL of a 9.5 M stock HCl solution to obtain a 1.4 M HCl solution?
| 238 mL |
| 530 mL |
| 300 mL |
| 425 mL |
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Question 7 1 pts
What volume of 2.5 M glucose solution contains 0.78 mols of glucose?
| 0.312 L |
| 0.631 L |
| 0.095 L |
| 2.5 L |
In: Chemistry
A mass of 0.3 kg hangs motionless from a vertical spring whose length is 0.88 m and whose unstretched length is 0.48 m. Next the mass is pulled down to where the spring has a length of 1.08 m and given an initial speed upwards of 1.9 m/s. What is the maximum length of the spring during the motion that follows?
In: Physics
Using the following returns, calculate the expected returns, the variance, standard deviations and coefficient of variation for X and Y.
Prob | Rx | Ry |
0.35 | 12.2 | 9.65 |
0.3 | 0 | -2 |
0.35 | 6.5 | 12.5 |
Show All in Excel.
In: Finance
One year ago, you bought the ABC bond with a maturity of 30 years for $980. The bond’s capital gains yield is -0.3% as of today. The bond’s coupon rate is 7.0% with semiannual payment of coupon. What is the YTM for the bond as of today?
In: Finance
27.58=0.5⋅(10(4.53678−(1149.360/(x+24.906)))+(0.3⋅(10(4.37576−(1175.581/(x−2.07)))+(0.2⋅(10(4.3281−(1132.108/(x+0.918)))
Hello We dont know how to solve for x in the above equation.
In: Advanced Math
Calculate to the accuracy of 10%
Suppose you measure the terminal voltage of a 0.2-Volt alkaline cell having an internal resistance of 0.3 Ω by placing a 8.6-kΩ voltmeter across its terminals. Find the terminal voltage U.
In: Physics
5. Solve equation y'+2y=2-e^-4t, where y(0)=1
6. Use Euler’s method for a previous problem at t=0, 0.1, 0.2, 0.3. Compare approximate and the exact values of y.
In: Math
Calculate the pH, pOH, [H3O+], and [OH-] of the following
solutions:
(a) 0.001 M HNO3,
(b) 0.3 M Ca(OH)2;
(c) 3.0 M HNO3,
(d) 6.0 M NaOH,
(e) 0.05 M HBr
In: Chemistry
Let A and B be events with P(A) = 0.5, P(Bc ) = 0.4, P(Ac ∩ Bc ) = 0.3.
(a) Calculate P(A ∪ B), P(A ∩ B), P(B|(A ∪ B)), and P(Ac |B).
b) Are A and B independent? Explain why.
In: Statistics and Probability