Scientists used to believe that the earth was the center of the universe. which invention was primarily responsible for obtaining evidence against this?

a. sextant

b. astrolabe

c. hubble telescope

d. optical telescope

A satellite of mass 4500 kg orbits the Earth in a circular orbit of radius of 7.2 * 106 m (this is above the Earth's atmosphere). The mass of the Earth is 6 * 1024 kg. What is the speed of the satellite?

In which phase change does a substance change from a liquid to a gas

Tamara says that the calcium (Ca) ion has a + 1 charge. Using the periodic table, is she correct? Explain why or why not.

An object accelerates from rest to 85m/s over a distance of 36m. What acceleration did it experience?

You need to lift up a 45-N object. Explain the strength and direction of the force used to lift the object.

Is a lung a living organism, why or why not?

A wire carries a steady current of 2.20 A. A straight section of the wire is 0.750 m long and lies along the y axis within a uniform magnetic field, vector B = 1.70 k T.

A 5.00-kg howler monkey is swinging due east on a vine. It overtakes and grabs onto a 6.00-kg monkey also moving east on a second vine. The first monkey is moving at 10.0 m/s at the instant it grabs the second, which is moving at 7.00 m/s.

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.