A light-year is the distance that light can travel in one year. If the sun is 1.5 x 10⁸ km away, how many light years is the sun from earth? Assume that light travels at a speed of 3.0 x 10¹⁰ cm/s.

How do you solve for net force

You leave the doctor's office after your annual checkup and recall that you weighed 687 N in her office. You then get into an elevator that, conveniently, has a scale.

A teacher stands well back from an outside doorway 0.88 m wide, and blows a whistle of frequency 780 Hz. Ignoring reflections, estimate at what angle (s) it is not possible to hear the whistle clearly on the playground outside the doorway.

A 6.0 kg bucket of water is raised from a well by a rope. if the upward acceleration of the bucket is 3.9 m/s2, find the force exerted by the rope on the bucket

What is the definition of half metals or semi metals?

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