A nerve impulse travels along a myelinated neuron at 60.3 m/s. What is this speed in mi/h and What is this speed in cm/ms?

Newton's law of universal gravitation can be expressed by the equation F = G  Mm r2 , where F is the gravitational force, M and m are masses, and r is a length. Force has the SI units kg · m/s2. What are the SI units of the proportionality constant G?

An object’s average density ρ is defined as the ratio of its mass to its volume: ρ = M/V. The earth’s mass is 5.94 x 1024 kg, and its volume is 1.08 x 1012 km3. What is the earth’s average density?A. 5.50 x 103 kg/m3           B. 5.50 x 106 kg/m3C. 5.50 x 109 kg/m3           D. 5.50 x 1012 kg/m3

Tom Cogwagee Longboat, of the Six Nations of the Grand River, is one of Ontario's best known distance runners. In 1907, he set a new Boston Marathon record, beating all of the previous decade's champions by almost 5 minutes! If he ran the 39.2 km course in 2 hours, 24 minutes and 24 seconds, what was his speed? HINT: we'll need our units to be metres per second - what do you need to convert in the question? 0.221 m/s O 0.272 m/s O 4.52 m/s O 17.5 m/s

You have been given a small rock sample to identify based on its density. Suppose that you use the displacement method to determine the volume of the rock sample to be 95 cm³ . The mass of the sample is 285 g. Which of the following is the most likely composition of this sample? Granite: density = 2650 kg/m³ O Limestone: density = 1978 kg/m³ Iron-Nickel Alloy: density = 9900 kg/m³ Basalt: density = 3000 kg/m³ Granite: density = 2150 kg/m³ Peridotite: density = 3300 kg/m3

Suppose a machine is invented to measure the amount of knowledge in a student’s head in units called “factoids.” One student is measured at F(t) = t³ − 6t² + 9t factoids at time t, where t is measured in weeks. a. Find the rate at which the student is gaining (or losing) knowledge as a function of time (be sure to give the units). b. During what time between t = 0 and 11 is the student losing knowledge? c. Sketch a graph of the function F(t).

A​ "bullet" train set a new world record for train speed at 552 kilometers per hour during a manned test run on the Test Line in April 1999. The Test Line is 42.8 kilometers long. How many minutes would a test run on the Test Line last at this​ record-setting speed?

v (m/s) 1.0 0.5 t (s) 0.60 0.20 0.40 FIGURE P2.18

a.     A painter uses 4.5 litres of paint to cover a wall with an area of 50 m2. Calculate the average rate of paint coverage in m2/L. b     The painter works for 1.5 hours and then rests for half an hour before completing the painting in another hour. Find the average rate at which the painter paints the wall in m2/h.

You are driving 65.0 miles/hour and you see a police car, so you slow down to 42.5 miles/hour. It takes you 3 seconds to do this. What is your deceleration? (I asked this one before, but someone plugged in -22.5 miles/hr x 2.237 m/s / 1 mile an hour which I didn't understand)