a) To the nearest power of 10, what is the population of the world? b) To the nearest power of 10, how old is the Earth is years? c) To the nearest power of 10, what is Earth's circumference in meters?

Estimate the number of steps you would have to take to walk a distance equal to the circumference of the Earth. (We estimate that the length of a step for an average person is about 18 inches, or roughly 0.5 m. The radius of the Earth is 6.38 x 106 m.) 105 steps 108 steps 1011 steps 1015 steps O 1020 steps

1)A grocery store sells 5-lb bag of apples. A customer bought apples weekly and made a record of his purchases: The weighing scale in the grocery store has an uncertainty of 10.3 lb. The customer obtained the following measurements: Week 1: weight is 4.8 Ib Week 2: weight is 5.3 lb Week 3: weig is 4.9 Ib Week 4: weight is 5.4 lb What is the Percent Uncertainty of the bag's weight?

I need help with a University Physics 1 (significant figures) - The problem is described in the image below:

Run up a flight of stairs as fast as you can, measure the time it takes and the height of one stair, and count the number of stairs. If you don't know your weight, measure that too. These measurements need not have three significant digits, but the calculated values do. Recall that 1 inch is about 2.54 centimeters, and 2.2 pounds is the weight of about 1 kg of mass.weight =  148.5 poundstime =  1.66 sheight of one stair = 18.5 cm, number of stairs = 12a. What is your power while running up stairs? Include units in your answer. b. The human body has an efficiency of about 28 percent. If you could maintain this stair-climbing pace around the clock, you could consume how many calories of food energy each day and not gain weight? (1 food calorie = 4186 joules)

How many years older will you be 1.30 billion seconds from now? (Assume a 365-day year.) dont provide handwritten solution

what would be the best UNIT OF DISTANCE to measure the diameter of a penny?

An ostrich runs with velocity 20 km/h for 2 hours (hrs), 12 km/h for 3 hours, and 40 km/h for another hour.Compute the total distance traveled and indicate with a graph how this quantity can be interpreted as an area.

Hello, I am having trouble with this homework question. What would be the best approach in solving this problem and getting the answer in both scientific notation and as a whole number?   Unit Conversions (Metric < -- > United States customary) 1 mile = 5280 feet = 1.6 km1 lb = 0.454 kg = 16 oz1 liter = 33.8 oz1 gallon = 3.78 liter 7) How many ounces are in 6 pounds? e.g.      6 lb x 16 oz ^ 1 lb = _______ oz   8) Convert 23 miles to feet.___________________________________________ ft9) Convert 120 lbs to kilograms.____________________________________________ kg10) Convert 451 mL to ounces.____________________________________________ oz11) Convert 2.5 miles to km.____________________________________________ km12) Convert 2 days to seconds._________________________________________ s13) Convert 75 minutes to days._________________________________________ days14) Convert 1.8 gallon to ounces.____________________________________________ oz

Given that 4.82803 kilometers (km) is approximately equal to 3 miles (mi):  Part A: Express the kilometer to mile ratio as a unit ratio. Round to 5 decimal places.