The mass of the Moon is 7.35*10^22 kg and the mass of the Earth is 6.00*10^24 kg. The distance between the Moon and the Earth is 3.80*10 km. Choose your coordinate system so that the center of the Earth is at the origin and the center of the Moon is on the x-axis at x = 3.80*10^8 m. Calculate the location xem of the center of mass of the Earth- Moon system

According to the law of conservation of mass, in a chemical reaction the total starting mass of all the reactants equal the total final mass of all the products. true or false?

Work = force × a. work b. energy c. distance d. momentum

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)