Which period of geological history marks a time of life rapidly becoming more complex for the first time and a time for which we have an extensive fossil record

What is the resultant velocity

The electric field of a sinusoidal electromagnetic wave obeys the equation E = (375V/m) cos[ (1.99*107rad/m) x + (5.97*1015rad/s) t]. a. What is the amplitude of the electric field of this wave? b.

How does charging by conduction work?

Which atmospheric gas is primarily responsible for the greenhouse effect? a. carbon dioxide (co2) b. oxygen (o2) c. nitrogen (n2) d. water vapor

When returning from sea a green navigational buoy should be passed in what manner?

What is the density of cylindrical (coin) object if it has a mass of 0.69 kg, and a radius of 0.03 m, along with a thickness of 0.003 m?

A horse canters away from its trainer in a straight line, moving 37 m away in 9.1 s. It then turns abruptly and gallops halfway back in 1.8 s. Calculate its average speed for the entire trip. Express your answer using two significant figures.

A 13,000 N car starts at rest and rolls down a hill froma height of 10 m. It then moves across a level surfaceand collides with a light spring-loaded guardrail.

Convert 52.3 weeks into days 367.5 days 366.1 days 450 days

From the earth, the moon subtends an angle of approximately 0.5°. If the distance to the moon is approximately 240,000 miles, find an approximation for the diameter of the moon accurate to the nearest hundred miles.