Which could be true about an unknown sample with a pH of 7?

A small sphere with mass 5.00.*10-7kg and charge + 3.00μC is released from rest a distance of 0.400 m above a large horizontal insulating sheet of charge that has uniform surface charge density σ=+8.00pC/m2.

An airplane takes 4 hours to travel a distance of 3600 miles with the wind. The return trip takes 5 hours against the wind. Find the speed of the plane in still air and the speed of the wind.

An illness caused by protist.

How many collisons occur when a vehichle hits a solid object A 2 B 3 C. 0 D 1

Diamond has an index of refraction of 2.419. What is the critical angle for internal reflection inside a diamond that is in air? A) 155° B) 105° C) 48.8° D) 24.4° E) 131°

The siren of a fire engine that is driving northward at 30.0 m/s emits a sound of frequency 2000 Hz. A truck in front of this fire engine is moving northward at 20.0 m/s.

If an atom has 34 protons and 40 neutrons, what is the mass number?

The atomic mass of an atom (in amu) is equal to Question 11 options: A. the total number of its protons, neutrons, and electrons B. the total number of electrons C. the total number of protons D. the total number of its protons and neutrons E.

12. Which of these describes the gravitational force from a planet?" O large and pulls objects toward itself small and pulls objects toward itself O small and pushes objects away from itself O large and pushes objects away from itself

In a laundromat, during the spin-dry cycle of a washer, the rotating tub goes from rest to its maximum angular speed of 4.7 rev/s in 8.3 s. You lift the lid of the washer and notice that the tub decelerates and comes to a stop in 17.5 s.