Which eon of the geological time scale means " visiblr life "

A. phanerzoic

B. proterozoic

C. hadean

D. archean

A loudspeaker is placed between two observers who are 125 apart, alonq the line connecting them. If one observer (observer A) records a sound level of 55 dB and the other (observer B) records a sound level of 85 dB, how far is the speaker from each

Which of the following is an impact of trampling of beach grass by humans and vehicles? Decrease in air pollution Decrease in beach erosion Increase in sea water pollution Increase in marine plants and animals

List five examples of electromagnetic radiation. what is the speed of all forms of electromagnetic radiation in a vacuum

A 640 kg automobile slides across an icy street at a speed of 63.9 km/h and collides with a parked car which has a mass of 816 kg. The two cars lock up and slide together. What is the speed of the two cars just after they collide?

What is the force required to accelerate a baseball with a mass of 0.145 kilograms and an acceleration of 35.00 meters/second squared?

The probability that a battery will last 10 hr or more is 0.8, and the probability that it will last 15 hr or more is 0.11. Given that a battery has lasted 10 hr, find the probability that it will last 15 hr or more

What is the sum of 9260 and 3240? Express your answer numerically to at least three significant figures.

What could you do if the plant is placed in your community and later leads to pollution beyond the amounts allowed by the EPA?

The friends now feel ready to try a problem. Suppose an Atwood machine has a mass of m1 = 2.5 kg and another mass of m2 = 8.5 kg hanging on opposite sides of the pulley. Assume the pulley is massless and frictionless, and the cord is ideal.

What are the 3 main branches of natural sciences