Scientists used to believe that the earth was the center of the universe. which invention was primarily responsible for obtaining evidence against this?

a. sextant

b. astrolabe

c. hubble telescope

d. optical telescope

How does lighting work?

a 1000 foot spool of bare 12-gauge copper wire weighs 19.8 pounds. How much will 18 inches of the wire weigh, in ounces?

A weight lifter struggles but manages to keep a heavy barbell abovehis head. Occasionally he slips and the barbell starts to fall downward, but he always recovers.

How does the Sun release nuclear energy? through the fusion of a uranium nucleus into smaller nuclei through the fusion of hydrogen nuclei into a heavier nucleus through the fission of a uranium nucleus into smaller nuclei through the fission of

ick jumps off his roof which is 10 meters tall onto his trampoline which has a height of 1 meter and acts like a spring. Nick has a mass of 70 kg and sinks 0.4 meters into the trampoline before coming to a complete stop.

What are the arrangement of resistors in series

A pilot flies horizontally at 1300 km/h, at height h! 35 m above initially level ground. However, at time t! 0, the pilot begins to fly over ground sloping upward at angle u! 4.3° (Fig. 2-38).

A helicopter flies 30 km 30 degrees north of east, drops of the supplies to a research team; it then heads 50 degrees north of west traveling 70 km to drop the supplies to a filming crew. What is the resultant displacement of the helicopter?

Plaskett's binary system consists of two stars that revolve in a circular orbit about a center of mass midway between them. This statement implies that the masses of the two stars are equal (see figure below).

Is mercury (the planet) rocky or gaseous (meaning relating to or having the characteristics of a gas.)