An electron (m = 9.11 x 10 ^-31 kg) moves in a circle whose radius is 2.00 x 10^-2 m. If the force acting on the electron is 4.60 x 10^-14 N, what is the speed?

What is another name for matter/material

Give a critical discussion on why hardness test needs to perform in engineering practice. b) Discuss 2 possible source of errors (other than parallax error) and how it's can effect the result.

An elements properties can be predicted from its

Which type of materials would you expect to have the smallest resistivities?

When must scientific theories be changed? A. When one experiment shows a surprising result. B. When a new government is elected. C. When an old scientist dies D. When new evidence is discovered

The scientific method begins with recognizing a problem. The recognized problem in this scenario is, "Why is the printer in the office not working?" Choose the hypotheses that are testable and from which an experiment can be formed.

The correctly balanced equation for H2O2 → H2O + O2 is

How would an unbalanced chemical equation convey misleading information about what took place during a chemical reaction?

A car rounds a 75-m radius curve at a constant speed of 18 m/s. a ball is suspended by a string from the ceiling the car and moves with the car. the angle between the string and the vertical is:

Emission of light from an atom occurs when an electron