By Tom Hsu
Ebook by means of Hsu, Tom
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Extra resources for Foundations of Physics
Sample text
1) This is a two-part problem asking for distance in kilometers and time in hours. 2) You are given a speed and time for the first part, and a speed and distance for the second. 2 Observations of Motion Knowing how quantities like speed are affected by other variables is an important part of physics. For example, the speed of a ball rolling downhill is different at different positions along the hill. The relationship between the position and speed of the ball is described by a model. In physics, a model is a description of the relationship between variables.
You usually want to identify a moment in time relative to the rest of the universe and everyone in it. To answer this question, you would look at a clock or at your watch at one particular moment. M. Eastern Time on April 21, 2004, tells the time at a certain place on Earth. How much time? ” (did something take to occur, for instance), you are looking for a quantity of time. To answer, you need to measure an interval of time with both a beginning and an end. For example, you might measure how much time has passed between the start of a race and when the first runner crosses the finish line.
5. How many minutes are in one year? a. 4 millimeters 6. Express each number in scientific notation: b. 24 kilometers a. 10,000 c. 300,000,000 e. 000023 c. 31 feet b. 520 d. 000001 f. 00444 d. 1 centimeters Convert: a. 25 kilometers = ___ miles b. 3 miles = ___ feet c. 400 centimeters = ___ meters d. 5 m tall. a. Calculate its surface area in m2. b. Calculate its surface area in cm2. c. Calculate its volume in m3. A cylindrical can is 15 cm tall and has a radius of 3 cm. a. Calculate the can’s surface area in cm2.