Se o Universo tem uma idade definida, de aproximadamente 13,7 bilhões de anos, o que existiu antes do big-bang?

To get up on the roof, a person with a mass m=75kg they use a aluminum ladder (mass 12.5kg and length 6.0m) against a house on a concrete pad with the base of the ladder 2m from the house.

HCI is___ An acid A base A salt

The Solar System formed from the ... A. Collapse of an interstellar cloud B. Collision of two massive stars C. Explosion of an interstellar sun D. Grouping together of asteroids

Calculate the power rating of a home appliance (in kilowatts) that uses 8 amps of current when plugged into a 120-volt outlet.

Why might the cost of fossil fuels become more expensive in the future?

A bird has a mass of 0.8 kg and flies at a speed of 11.2 m/s. How much kinetic energy does the bird have?

You've already gathered data to measure the relationship between reading skills and extroversion. Now, you look at the data to determine if reading skills and extroversion have a negative or positive correlation.

Many people believe that a vacuum created inside a vacuumcleaner causes particles of dirt to be drawn in. Actually, however, the dirt is pushed in. Explain.

Earth's magnetic field flips every A. half million years B. every other year C. 100years

What could u test to determine the stage of a stars cycle