You observe the moon rising at 6 p. m., around sunset. its phase is

The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed? A. 25 g B. 100 g C. 75 g D. 50 g

When did dalton form his atomic theory?

A hydroelectric plant takes energy from water and turns it into electrical energy. What are the transformations of energy in the water molecules that are used in the process of generating electricity this way?

A bike rider rides at an average of 12 m/s for 30 minutes. How many km can the rider travel in that time? Show your work. (What it means by that time? I meant the 30 min just to let you guys know^^)

Which activity will create tension in the legs

On which moment of inertia of an object does depend on?

How much energy is needed to melt 600 g of ice at 0 degrees C?

The speed of water waves decreases as the water becomes shallower. suppose waves travel across the surface of a lake with a speed of 2.0 m/s and a wavelength of 1.5 m. when these waves move into shallow part of the lake, their speed decreases to 1.

A rock is dropped at the same instant that a ball at the same height is thrown horizontally. which will will have the greater speed when it reaches the ground? ball rock both will reach at the same time impossible to answer

A cold beer initially at 35ºF warms up to 40ºF in 3 min while sitting in a room of temperature 70ºF. How warm will the beer be if left out for 20 min