the speed of sound in the air is about 340m/s. what is the wavelength of a sound wave with a frequency of 400Hz?

If you wanted to detect x-rays coming from the sun, where would you place the detector?

A soccer player runs with a speed of 4.6m/s how long does it take him to run 60m

How does the number of valence electrons affect the reactivity?

Which of these illustrates that sound waves can travel through a liquid? A. Voices can be heard as people speak to one another B. Whales and porpoises signal each other by making sounds C.

Which of the following is not a force causing plate motion? A. Slab pull B. Ridge push C. Gravity

One of the heating systems we talked about in this course comprises of a system of ducts. What is the process by which heat is transferred in this system? a. Conduction b. Convection c. Radiation d. None of the above

If the north pole of a magnet in a compass is attracted to Earth's geographic north, what must be the polarity of Earth's magnetic north pole? A. north B. south C. It can't be determined from the information given.

A canoe started its trip at 8 am. If the cannoe travelled at a speed of 70 mph how far did it travel by 1:36 pm?

1. Tariff of 1828 John C. Fremont 2. abolitionist who led the raid on Harper's Ferry John Brown 3. published The Liberator Santa Anna 4. Underground Railroad Harriet Tubman 5. died at the Alamo William Lloyd Garrison 6.

Which interaction of nature is weakest? a. strong c. electromagnetic b. weak d. gravitational