How do you find the density of an object?

A metal ball with diameter of a half a centimeter and hanging from an insulating thread is charged up with 1010 excess electrons.

The speed of sound in air is about 340 meters per second. You see a flash of lightning, then hear the thunder 9 seconds later. Calculate the distance between you and the storm in meters, then convert to kilometers.

Salt is added to water and the mixture is stirred until no more salt dissolves. some solid salt does not dissolve and settles to the bottom of the beaker, as shown in the figure below.

Which two supreme court cases delt with the first amendment rights of students in public schools

Which of the following statements is untrue in regard to sound traveling in air? A. During a single vibration of the diaphragm, molecules in the air near it will also complete one vibration. B.

Since there are no aurora observed on Venus we can conclude that Venus a. lacks atmospheric oxygen b. is too hot for magnetic forces. c. lacks a strong magnetic field. d. lacks strong winds.

A grocery shopper tosses a (n) 9.1 kg bag of rice into a stationary 19.3 kg grocery cart. The bag hits the cart with a horizontal speed of 6.6 m/s toward the front of the cart. What is the final speed of the cart and bag? Answer in units of m/s.

Where do most metamorphic rocks processes take place?

A 13,500 kg railroad freight car travels on a level track at a speed of 4.5 m/s. It collided and coupled with a 25,000 kg second car, initially at rest and with brakes released. What is the speed of the two cars after collision

What type of waves move energy forward, but the source makes up and down