You see a bolt of lightning and hear thunder two seconds later. The speed of sound is about 343 m/s. Estimate?
Time：2012-10-19 21:43:44 +0000 - 1 year ago
The thickness of a book is 3.2 cm, measured between the insides of its covers. The highest page number in the book is 1,096. What order-of-magnitude estimate does that give for the thickness of a page of the book?
You need to estimate the floor area of your unusual oval-shaped living room from memory. You remember that it is longer than it is wider, and is about 6 m long. So you take it to be rectangular with a width of 0.5 m and multiply width by length to get an estimate of 3 m2. Why was your estimate not done correctly?
The floor was not really rectangular.
The area of a rectangle is not simply its length multiplied by its width.
The assumed width was unrealistic.
The estimate ignored the space occupied by the furniture.
Why would scientists perform an order-of-magnitude calculation of the number of stars in the universe, rather than calculating them exactly?
An order-of-magnitude calculation contains more information.
The information needed for an exact calculation is unknown.
An order-of-magnitude calculation is more accurate.
An order-of-magnitude calculation does not require rounding off.
You construct a pendulum by attaching a weight (the bob) to a string. You notice that the bob swings a distance of 2 in. every second. Estimate the average speed at which the bob moves. Assume that 1 in. is approximately 2.5 cm.
5 × 10^-2 m/s
5 × 10^-4 m/s