Which astronomer spent 20 years plotting the positions of the planets

A small but bright light is at the bottom of a pool 2.2 m deep. How wide is the circle of light that exits the surface of the water when that light shines in the middle of the night? Remember that nwater=1.33 .

A crate is lifted vertically 1.5 m and then heldat rest. The crate has weight 100 N (i. e., it issupported by an upward force of 100 N). How much work was done in lifting thecrate from the ground to its final position?1. More than 150 J2. 150 J3.

8 Grade Science Explain how a Lava lamp demonstrates convection currents.

What is free-fall acceleration on the surface of the moon?

A visitor to a lighthouse wishes to determine the height of the tower. The visitor ties a spool of thread to a small rock to make a simple pendulum, then hangs the pendulum down a spiral staircase in the center of the tower.

1. Strzała o masie 20 g tuż po wystrzale ma prędkość 50 m/s. Oblicz pracę wykonaną przez zawodniczkę. Ile wynosi energia potencjalna sprężystości napiętej cięciwy? 2. Na trampolinę o współczynniku sprężystości k=2 kN/m stanął zawodnik o masie 80 kg.

Two small plastic spheres between them has magnitude 0.22 N. What is the charge on each sphere is one the other? Explain whether it can be determined from the information give, whether the charges are positive or negative.

If it has enough kinetic energy, a moleculeat the surface of the Earth can escape the Earth's gravitation. The acceleration of gravity is 9.8 m/s2, and the Boltzmanns' constant is 1.38066*10-23 J/K.

True or False. Alcohol is toxic to most fruit flies, but fruit flies that metabolize alcohol quickly survive alcohol exposure better than normal metabolizers.

Aerobic exercise is exercise where oxygen is not present. Question options: True False