If 50% of a radioactive element remains after 4000years what is the half life

How does the eye and brain work together to give you perception of color

On a cold winter day, the air temperature is 2°c and the wet-bulb temperature is - 1°c. what is the relative humidity at this location?

Soul that drains slowly and most likely has a high amount of what?

A 12-V battery is connected to an air-filled capacitor that consists of two parallel plates, each plate has an area of 7.60 cm2 . The separation between the plates of the capacitor is d = 0.30 cm.

A ski that is placed on snow will stick to the snow. However, when the ski is moved along the snow, the rubbing warms and partially melts the snow, reducing the coefficient of kinetic friction and promoting sliding.

Why does it hurt your hands when you carry heavy shopping in carrier bags?

Why did scientists choose carbon as a base for the atomic mass unit? Which isotope of carbon did they use?

What organelle is found in all animal cells and some plant cells

Basic of Archimedes's principle of how fluid can make body to float and sink.

A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gun powder. What is the average force (in N) exerted on a 0.0500 kg bullet to accelerate it to a speed of 625 m/s in a time of 1.10 ms (milliseconds)