3. A block with a force of the Earth of -300. N is moved at constant velocity over a horizontal surface by a force of +50.0 N applied parallel to the surface. What is the coefficient of kinetic friction?

Which of the following represents a virtual image?

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples

Humidity is to blame for that muggy, steamy feeling you experience on some hot summer days. what gas in the atmosphere causes humidity? a) oxygen b) hydrogen c) nitrogen d) water vapor