An individual is a fifty-year-old smoker that lives in a highly polluted city, gets no exercise, eats fast food every day, and

has a family history of lung cancer. Which of the following is an uncontrollable risk factor?

The following diagrams show five pairs of asteroids, labeled with their relative masses (M) and distances (d) between them.

Explain our ideas about why the terrestrial planets are rocky and have less gas than the giant planets.

Negative charge in a conductor is a result of: lack of electrons neutralization by the atom's nucleus. surplus of electrons

The rechargeable batteries for a laptop computer need a much smaller voltage than what a wall socket provides. Therefore, a transformer is plugged into the wall socket and produces the necessary voltage for charging the batteries.

Oil can be used to reduce friction. true or fales take 100 mark for solving gg

An empty train car of mass 2.0 x 104kg coasts along at 10 m/s. A 3000-kg boulder is suddenly dropped vertically into the car. Find the speed of the car immediately after the boulder is dropped in.

Measuring which physical property is most likely to produce the most precise results when trying to identify a substance? luster hardness density viscosity

How is current transferred from the moving armature to the rest of the circuit in an alternating current generator?

There are two types of waves, mechanical and electromagnetic. Microwaves, infrared, and radio was are examples of electromagnetic waves. Which statement is true about the speed of an electromagnetic wave? A) It is not affected by changes in media.

Which of the following changes occurs naturally in a system over time?