Carbon-14 has a half-life of 5,730 years. if the age of an object older than 50,000 years cannot be determined by radiocarbon dating, then

A scientist is studying a sample of matter the matter has no definite shape or volume and it can conduct an electric current. The sample is most likely in which of the following states A. solid B. Liquid C. gas D. plasma

The method of heat transfer by which the sun energy reaches the earth is A) conduction B) convection C) radiation D) solaration

Many of the whales in the ocean rely upon tiny marine organisms, called plankton, for food. If all of the plankton suddenly died, what might happen to the whales? A. They would start eating fish. B. They would not survive either. C.

A geologist is comparing the properties of different minerals. He rubs each one on a piece of white tile and observes the color of he power that is left behind. What type of test did he perform? color hardness luster streak

Write the equation of a line with a gradient of 5, if y=7 when x=1

A skydiver with a mass of 60 kg jumps from an airplane. Five seconds after jumping the force of air resistance is 300 N. What is the acceleration of the sky diver, five seconds after jumping?

How many basic wave forms are there? A.) 1 B.) 2 C.) 3 D.) 4

How much power is reqired to lift a 10-n box 2 meters

Dolphins and other sea creatures can leap to great heights by swimming straight up and exiting the water at a high speed. A 200 kg dolphin leaps straight up to a height of 7.8 m.

An example of renewable energy resource is ... A - uranium B - Wind C - natural gas