If we put a cool object into a preheated oven, Newton's law of heating tells us that the difference between the tem perature of the oven and the tem perature of the object decreases exponentially with time. The percentage rate of decrease depends on the material that is being heated. Suppose a potato initially has a tem perature of 75 degrees and the oven is preheated to 375 degrees. Use the form ula D = 300 x 0.98t, where D is the tem perature difference between the oven and the potato, tis the time in minutes the potato has been in the oven, and all tem peratures are measured in degrees Fahrenheit. What is the tem perature difference after 45 minutes? (Round your answer to the nearest degree.)
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.
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