In SI units, speeds are measured in meters per second (m/s). But, depending on where you live, you’re probably mole comfortable of thinking of speeds in terms of either kilometers per hour (km/h) or miles per hour (mi/h). In this problem, you will see that 1 m/s is roughly 4 km/h or 2 mi/h, which is handy to use when developing your physical Intuition. More precisely, show that (a) 1 .0 m/s = 3 .6 km/h and 1 .0 m/s = 2 .2 mi/h .
In SI units, speeds are measured in meters per second (m/s). But, depending on where you live, you’re probably mole comfortable of thinking of speeds in terms of either kilometers per hour (km/h) or miles per hour (mi/h). In this problem, you will see that 1 m/s is roughly 4 km/h or 2 mi/h, which is handy to use when developing your physical Intuition. More precisely, show that (a) 1 .0 m/s = 3 .6 km/h and 1 .0 m/s = 2 .2 mi/h .
In SI units, speeds are measured in meters per second (m/s). But, depending on where you live, you’re probably mole comfortable of thinking of speeds in terms of either kilometers per hour (km/h) or miles per hour (mi/h). In this problem, you will see that 1 m/s is roughly 4 km/h or 2 mi/h, which is handy to use when developing your physical Intuition. More precisely, show that (a)
1
.0 m/s = 3
.6 km/h
and
1
.0 m/s = 2
.2 mi/h
.
(a) Calculate how many meters are in 1 inch. How many inches are in 1 m? (b) A mile is 5 280 feet and a foot is 12 inches. The speed of sound in the atmosphere at sea level is 345 m/s. Express the speed of sound in miles per second and miles per hour. (c) There is a delay between lightning and thunder in a storm, because light reaches us almost instantaneously, but sound is slower. How many meters, kilometers, and miles away is lightning if the sound reaches you 3.00 s after the light?
You get lost and stop at a gas station to ask for directions. The attendant tells you that your destination is "about 1 mile down the road". You drive to your destination, but you notice that, according to your trip odometer, you have driven 1.9 miles. What was the % error in the attendant's distance estimate?
( Note: We will temporarily ignore the sign for error calculations.
The correct answer for each calculation is an integerbetween 0 and 100, inclusive.
Do NOT enter the percent sign (%) or a minus sign (-). )
(a) A car speedometer has a 5% uncertainty. What is the range of possible speeds when it reads 90 km/h? (b) Convert this range to miles per hour. Note 1 km = 0.6214 mi.
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