QUESTION 19 A sample of lake water at 25°C has a hardness of 25 mg/L and [Mg2+] 1.0×104 M. Which of the following statements is true? OA Hardness index of the lake water is 25 mg CaCO3/L OB. Hardness index of the lake water is 0.25 M. OC Hardness index of the lake water is 25 M DD. Hardness index of the lake water is 2.5 M

Q: How many significant digits are there in the number 4530.0. Answer: 5 x

A: According to question we need to find number of significant digits.

Q: Convert the following to Sl units: 4.55 ms HA Value Units

A: Solution: Given,  4.55 ms Unit of above number is ms(millisecond) millisecond is a unit of time SI…

Q: In the figure R₁ = 1200, R₂ = R3 = 55.00, R4 = 73.7 0, and the ideal battery has emf ε = 6.00 V. (a)…

A:

Q: (b) What is Hall effect? Find the torque on a current carrying conducting rectangular loop of length…

A: Definition: When magnetic field is applied in a direction perpendicular to flow of current,…

Q: the answer is A so the solution you have sent is incorrect

A:

Q: There are many exceptions to the Law of Conservation of Mass. True False

A: By the Law of Conservation of Mass, matter can neither be created nor be destroyed in a chemical or…

Q: both of the answer is incorrect

A:

Q: how about if it 87%

A:

Q: 7. A Pyramid in Egypt has a square base 230 m on each side. The faces of the pyramid make an angle…

A: Pyramid is an example for a square prism.  Variables known, The length of the square base is 230m,…

Q: In the figure R₁ = 11002, R2 = R3 = 38.00, R4 = 75.6 02, and the ideal battery has emf ε = 6.00 V.…

A:

Q: nswers were wrong

A: Given, Initial speed, v0  = 53 km /h = 53 ×10003600 m/s = 14.72 m/s Reaction time = 1s Stopping…

Q: The deck has a mass of 1000-kg and is supported by cables A, B, and C. What are the tensions in the…

A: We have given  that the mass of object is 1000 Kg. It is supported by three cables.  As there is no…

Q: 4. Discuss the application of physics in the field of textile. Briefly.

A: Physics plays an important role in textile technology. The study of the structure and physical…

Q: am confused about the solutions

A: Express answers in parts (a), (b), and (c) in terms of m, L, v, and physical constants as…

Q: (d) Number (e) Number Mo i Units Units

A:

Q: A hypothetical NH molecule makes a rotational-level transition from I= 3 to l = 1 and gives off a…

A:

Q: Determine the magnitude of the towing force F if the resultant force has a magnitude Fr=13 kN and is…

A: We will first resolve the given forces into components along x and y axis. Then we will use given…

Q: What is a base unit

A: The quantities can be classified into two groups i.e. base units and derived units. Base unit is one…

Q: Convert to full form f) 2.37 x 10-2 g) 3.22 x 106 h) 5.49 x 103

A:

Q: The solar power per unit area at the Earth's distance from the sun--called the "solar constant"--is…

A:

Q: 1. For the graph shown, the dependent variable is and independent variable is 120 100 80 60 40 20 8.…

A: 1. Dependent variable = extension     Independent variable = mass 2. The scale chosen for Y axis is…

Q: resolve correctly

A: Given: Current in the 4 ohm resistor is I = 0.2 A. Required: Potential drop across the 4 ohm…

Q: In the case of half-wave rectifier, what is the correct answer:

A: As per the company policy, only 1st question will be answered here, please post the rest separately.…

Q: 15) Food Fightl Someone throws a perfectly good hamburger across the cafeteria. What velocity does…

A: Given Data: Mass, m=0.35 kg Kinetic Energy, K.E=79 J

Q: https://www.compadre.org/PQP/applications/section14_3.cfm

A: The electric field at a point inside a spherical shell is zero. This applies to the region between…

Q: What is financial repression and why does it exist?

A:

Q: How many kw-hr of energy does a 40 Watt light bulb use in one hour?   B) FPL charges 10.8 cents…

A:

Q: Gram is the fundamental unit of mass in SI system

A: SI base unit of mass is kilogram.It is represented by letter Kg.

Q: ) if A = = 3i+4j +2K and B= -2i +6j +5k find A. В. (A.B änjö a)

A: Option b

Q: How to determine c urrent using right hand rule

A:

Q: In the figure, block 1 has mass m₁ = 480 g, block 2 has mass m2 = 560 g, and the pulley is on a…

A:

Q: (B) What happens to the velocity of a body as it moves away from the sun? Kepler's First Law Write…

A: Hi, as per guidelines for multiple questions, the first two questions have been answered. When a…

Q: A signed value is one that can be positive, negative, or zero.   True   False

A: Signed value is 32 bit datum that encodes an integer which may be positive, negative or zero.