Objects are attracted to one another by the force of gravity. Gravity is proportional to the mass-the amount of matter-objects have; gravity decreases as the distance between the objects increases. An object's weight is a measurement of the Earth's gravitational pull on the object. What happens to the mass and weight of a rocket as it travels beyond Earth's orbit?

Pluto has a diameter of just 1,438 miles. It is made mostly of ice and frozen rock. It is very small and has an irregular orbit. It was originally classified as the ninth planet from the Sun, but it has been recategorized as a dwarf planet within the Kuiper belt. Which of the following is not a factual detail about Pluto?

Which of the following is implied by the fact that seafloor spreading at the Mid-Atlantic Ridge is causing the Atlantic Ocean to widen by about 5 centimeters a year?

When a cell reproduces through cell division, scientists call the reproducing cell the parent cell, and the two cells that result from the division are called daughter cells. The daughter cells are genetically identical to the parent cells. Before a parent cell starts to divide, the DNA in its nucleus replicates, or makes a complete copy of itself. Why is this process necessary?

You run an experiment to test which brand of food your dog prefers. You offer her three different brands of food at each meal, presenting them all at the same time (so that she does not just prefer the one that comes first!). Three weeks of data collection indicate that she ate Brand C more often than Brand A or Brand B. What can you conclude from these results?

"The World Health Organisation has recorded 184 human cases of the H5N1 strain of bird flu, all of them caused by contact with infected birds. That 103 of these have resulted in death indicates how dangerous this virus is, and no vaccine has yet been developed. For there to be a worldwide epidemic of H5N1 amongst humans, it would have to be possible for the virus to be passed easily from one person to another. Unlike normal influenza, H5N1 can only bind to receptors deep in the lungs. As a result, it cannot multiply in the upper respiratory system and thereby be transmitted by sneezing and coughing. So it cannot be transmitted easily between people. Influenza viruses can mutate, and thus possibly change the way in which they infect victims." Which of the following can be drawn as a conclusion from the passage above?

A ballet dancer of mass 80 kg and a wingspan of 80cm is executing a spin. She then folds her arms and brings them to within 20 cm from the central axis of her body. If she was initially making 3 rotations per second, how many does she make now?