Scientist to propose one of the first models of atoms

Which of the following statements is false? A. Two or more atoms combine chemically to form a molecule. B. Two or more different substances combine physically to form a mixture. C. Two or more different atoms combine chemically to form an element. D.

If the force experienced by a positively charged balloon is 2.7 newtons and the electric field strength is 7.8 * 105 newtons/coulomb, what is the magnitude of the charge on the balloon?

What is the frequency of a simple pendulum 2.7 m long in the following situations? (a) in a room that is stationary Hz (b) in an elevator accelerating upward at a rate of 1.1 m/s2 Hz (c) in free fall Hz

Frequency of electromagnetic waves that a radio station is assigned

An electrolytic cell can be used to plate gold onto other metal surfaces. The plating reaction is: Au (aq) e - - -> Au (s) Notice from the reaction that 1 mol e - plates out 1 mol Au (s).

A rod of mass M and length L can rotate about a hinge at its left end and is initially at rest. A putty ball of mass m, moving with speed V, strikes the rod at angle θ from the normal and sticks to the rod after the collision.

A satellite with a mass of 2,000 ㎏ is inserted into an orbit that is twice the Earth' s radius. W hat is the force of gravity on the satellite? The radius of the Earth is 6380 km, and the mass of the Earth is 5.98 X 1024 kg a. 2,000 N h.

our canisters contain helium gas. If all the canisters had the same amount of particles, which canister would have the fastest moving particles?

The acceleration due to gravity is

How does gravitational force and electric force compare?