According to Fidelity Investment Vision Magazine, the average weekly allowance of children varies directly as their grade level. In a recent year, the average allowance of a 9th-grade student was 9.66 dollars per week. What was the average weekly allowance of a 7 th-grade student? The loudness, L, of a sound (measured in decibels, dB) is inversely proportional to the square of the distance, d , from the source of the sound. A person 9 feet from a jetski, it is 100 decibels loud. How loud is the jetski when the person is 50 feet away? Wind resistance is jointly proportional to velocity and surface area of the object. If an object is traveling 57 mph and has a surface area of 5 square feet it will experience a wind resistance of 64.125 Newtons. How fast must an object be moving to experience a wind resistance of 222.075 Newtons if it has a surface area of 21 square feet?

Q: You have your ear against a new speaker when it emits a sounds with an intensity of 160 decibels

A: 1)Sounds below 70db don't cause any hearing damage.   2) Beyond 70db sounds isn't good for your ears…

Q: The safe load, L, of a wooden beam supported at both ends varies jointly as the width, w, and the…

A:

Q: Dallas-Ft. Worth, Texas has an average January temperature of 44.1 degrees Fahrenheit. What is this…

A: Dallas-Ft. Worth, Texas has an average January temperature of 44.1 degrees Fahrenheit

Q: 24 volts is 1/2% of what?

A: To write 24 volts is (1/2)% of what

Q: If John has a body density of 1.058 kg/L, what is his body fat percentage? (Answer to 1 digit after…

A: According to SIRI equation the body fat percentage is, %fat = [(4.95/D) – 4.50] × 100, where D is…

Unitary Method

The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products. 

Speed, Time, and Distance

Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.

Profit and Loss

The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.

Units and Measurements

Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.