A world record for the men's marathon was set by Dennis Kimetto of Kenya on September 28, 2014. He ran the race in 2:02:57. The official marathon length is 26.219 miles. What speed, in meters per second, did Dennis Kimetto run for that marathon? What was his speed in miles per hour?

An optician measures the diameter of her patient's pupil. The diameter is 0.0016m . What is the diameter in millimeters? Write your answer as a decimal.

Bronze is an alloy made of copper (Cu) and tin (Sn). Calculate the mass of a bronze cylinder of radius 9.31 cm and length 36.28 cm. The composition of the bronze is 79.42 percent Cu and 20.58 percent. Sn and the densities of Cu and Sn are 8.94 g/cm3 and 7.31 g/cm3, respectively. What assumption should you make in this calculation? Enter your answer in scientific notation.

A runner runs 4875 ft in 6.85 minutes. What is the runner's average speed in miles per hour?

A student was given an unknown metal.  The student determined that the mass of the metal was 30.2 g.  The student placed the metal in a graduated cylinder filled with 20.0 mL of water.  The metal increased the volume of water to 22.9 mL.  Calculate the density of the metal and determine the identity of the metal using the table below.

Suppose you are trying to find the volume of a box based on the given measurements for the length, width, and height of the box, where the height was measured in two parts.      length, l = 2.20 in      width, w = 3.71 in      height, h = 10.4 in + 1 in Calculate the height, ℎ, of the box, first keeping all digits, then rounding to the proper number of significant figures. unrounded h = ____in rounded h =____  in  Calculate the volume (V) of the box using V =l x w x h. Round to the proper number of significant figures.  v=_____in3

if a mosquito can fly 0.6708 m/s at top speed, what is this speed in miles per hour? 1 mile=1.61 km

In 1999, scientists discovered a new class of black holes with masses 100 to 10,000 times the mass of our sun, but occupying less space than our moon. Suppose that one of these black holes has a mass of 8×103 suns and a radius equal to one-half the radius of our moon. What is its density in grams per cubic centimeter? The mass of the sun is 2.0×1030kg and the radius of the moon is 2.16×103mi. (Volume of a sphere =43πr3.)

In 1999, scientists discovered a new class of black holes with masses 100 to 10,000 times the mass of our sun, but occupying less space than our moon. Suppose that one of these black holes has a mass of 1×10^3 suns and a radius equal to one-half the radius of our moon. What is its density in grams per cubic centimeter? The mass of the sun is 2.0×10^30 kg and the radius of the moon is 2.16×10^3 mi (Volume of a sphere =4/3πr^3)

The men's world record for swimming 1500.0 m in a long course pool (as of 2007) is 14 min 34.56 s. At this rate, Step 2: Convert 0.150 mi to meters using 1 mi = 1609 m. how many seconds would it take to swim 0.150 miles (1 mi = 1609 m) ? distance: m