Which statement best defines open system.

a) Open systems allows nothing to go in or out of the system.

b) Open systems allows something to go in and out of the system.

c) Open systems cannot give or take at all with another system

What is an example of when momentum is not conserved?

A town interested in installing wind turbines to generate electricity measures the speed of the wind in the town over the course of a year.

If the potential energy of the product is less than that of the reactants, the energy released when an activated complex forms a product will be more than the activation energy resulting in an exothermic reaction. 1. True2. False

Which of the following statements is true about magnetic fields. The earth's magnetic field is confined within the core of the earth. Magnetic fields are unreliable for use in navigation.

Carbon-12 Carbon-13 Carbon-14 Which BEST describes the difference between carbon-12 and carbon-14? A. Carbon-12 has one more neutron than carbon-14. B. Carbon-12 has two less protons than carbon-14. C. Carbon-14 has one less proton than carbon-12. D.

How far does a car go in 30 seconds at a speed of 29 m/s?

Classify the health care system in the US. Is it market based or command based? Why?

If a motorcycle moves with a constant velocity, can you conclude that there is no net force acting on it?

Which defintion of heat is most scientifically accurate

What is the name of the effect that causes water to travel at an angle to trade winds?