Which describes the correct energy conversion when a solar cell is used to light a street lamp?

solar to light

solar to light and heat

solar to electric to light and heat

heat to electric to light

What are three physical properties of sodium

A college student holds the back of his hand near an iron to see if it is hot. Heat is transferred to his hand by ... A Conduction B Convection C Radiation

Which unit of pressure is derived from the early barometers used to measure pressure? mmHg bar Pa atm

A cyclist rode at an average speed of 20 mph for 15 miles. How long was the ride?

One kind of baseball pitching machine works by rotating a light and stiff rigid rod about a horizontal axis until the ball is moving toward the target.

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