a train travels 81 kilometers in 2 hours and then 88 kilometers in 2 hours what is its average speed

Which of the following is not an ethical consideration of social research? a. protecting the anonymity of the participants b. creating a safe environment for research c. using research to reform society d.

Name two examples of greenhouse gases

Why is it important for scientists to use the scientific method?

If the energy of a photon is 1.32 * 10¯18 j, what is its wavelength in nm? a. 1.50 * 10¯7 nm b. 150. nm c. 1.99 * 1015 nm d. 1.99 * 1024 nm e. none of these choices is correct.

A piece of silicon sample has a resistivity of 0.1 ω. Cm. Its thickness is 100µm. The electron mobility is 1350cm 2 v - 1sec-1. When a magnetic field of bz and an ix of 1ma is supplied, the hall voltage is found out to be - 70µv.

You push against a steamer trunk with a force of 750 N at an angle of 25° with the horizontal. The trunk is on a flat floor and the coefficient of static friction between the trunk and floor is 0.77.

How does an electric field change due to voltage?

Voltage can exist without A. current. B. resistance. C. a closed circuit. D. all of these

How much work is done by the force of gravity when a 45 N object falls to the ground from a height of 4.6 m?

If you put a coin in a bottle and then stop the opening with a cork. how can you get the coin out of the bottle without pulling out the cork or breaking the bottle?