Can a measurement be exact

When a body falls to the earth, the earth also move up to meet it but the earth motion is not noticeable. why?

How many independent variables are present in the electrolysis experiment?

If the sun were to suddenly stop providing energy to earth, what would happen to Earth and its inhabitants?

In what two ways can a machine alter an input force?

The specific latent heat of fusion of ice is 3.3*105J/kg

the half-life of carbon - 14 is 5730 years. What fraction of carbon-14 would remain after 11,460 years?

An object with a mass of 10.9 kg experiences a force of 18.53 N. What is the acceleration of the object? A. 2.2 m/s2 B. 1.7 m/s2 C. 16.83 m/s2 D. 1.3 m/s2

A proton, starting from rest, accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field. What is the radius of the proton's resulting orbit

Which of the following terms are needed to completely describe speed? Check all that apply. A. Units B. Direction C. Number D. Mass

Drivers are able to see objects ahead of them because light travels through windshields.