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At a certain point on Earth, the horizontal component of Earth’s magnetic field is 2.5 × 10-5 T due to north. An electron moves eastward with just the right speed, so the magnetic force on it balances its weight. Find the speed of the electron.
What is the magnitude of the field if a charge of 10 C travelling at a speed of 8 × 106 m/s in a direction perpendicular to a magnetic field experiences a magnetic force of 8.7 × 10-3 N?
An electron is placed in an electric potential of 1nV. Determine the velocity of the electron after passing through the potential assuming it was motionless in the beginning
A certified public accountant claims that more than 30% of all accountants advertise. A sample of 400 accountants in Rizal province showd that 112 had used some form of advertising. At a ?0.01, is there enough evidence to support the claim? (Use p-value method)
Calculate the pH and pOH of the following solution and identify each solution as acidic, basic or neutral. (with solutions)
1. [H3O+] = 1.0 x 10-9 M
2. [OH-] = 1.0 x 10-8 M
3. [H3O+] = 0.0010 M
4. [OH-] = 0.010 M
Which statements about dilute sulfuric acid are correct?1. 1. It turns red litmus paper blue. 2. It reacts with magnesium(II) oxide to form magnesium(II) sulfate and water. 3. It reacts with magnesium to form magnesium(II) sulfate and carbon dioxide. 4. Its pH is below pH 7
Average Senior High School annual cost of tuition fee for all private schools last year was Php43,700. A random sample of costs this year for 45 private schools indicated that the sample mean was Php45,800 and a sample standard deviation was Php5,600. At 0.01 level of significance, is there sufficient evidence to conclude that the cost increased?
Identify the conjugate base and conjugate acids of each acid and bases
1. HOCl
4. F-
2. H2PO4-
5. HCO3-
3. H2O
6. H2O
. Calculate the following buffer solution using the Henderson-Hasselbalch equation.
1. Calculate the pH of the buffer solution that contain 0.20 M HOCl (Ka= 4.0 x 10-8) and 0.10 M HCl.
2. What is the pH of a buffer solution that contains 0.50 M CH3CO3H (Ka = 1.8 x 10-5 ) and 0.02 M
H2CO3?
A solution is prepared by dissolving 150 ml of isopropyl alcohol in enough water to produce 1.5 ml of rubbing solution.
A. What is the volume percent of alcohol in the solution?
B. What is the proof of the solution?
#339914 on Dec 2023