Determine the amount of time for polonium-210 to decay to one fourth its original quantity. The half-life of polonium-210 is 138 days. Explain.

A car has a mass of 1,000 kilograms. The weight of the car is newtons. Use g = 9.8 N/kg for gravity.

The invention of the microscope made it possible for people to discover a-plants b-skin c-animals d-cells.

Question A: If the gastropods listed in line 3 and line 6 were collected from shale containing leaf fossils what would their possible age be? Question B: Could you use radiocarbon dating to assign a numerical date/age to this rock unit? Explain

What causes the frequency of a wave to increase? A. Adding energy B. Decreasing energy

An object weighs 39.36 newtons. What is its mass if a gravitometer indicates that g = 9.83 m/s2? 4.0 kg 386.9 kg 0.3 kg

A 2 kg book is pushed across a table is a force 4. Assuming no friction, what is the acceleration of the book?

When electricians use wiring for houses they use both copper and rubber. Which do you think is used as a conductor?

Suppose that 600 W of radiation in a microwave oven is absorbed by 250 g of water in a very lightweight cup. Approximately how long will it take to heat the water from 20 C to 80 C? (A) 50 s (B) 100 s (C) 150 s (D) 200 s

Calculate the velocity of a 1650kg satellite that is in a circular orbit of 4.2 x 10^6m above the surface of a planet which has a radius 3.95 x 10^5 m and the period of the orbit is 2.0 hours.

A "conventional gear" tailwheel airplane has the center of mass aft of the two main wheels and a smaller, third wheel at the tail. a "tricycle gear" airplane has the center of mass forward of the two main wheels and the third wheel near the nose.