Calcium-51 has a half-life of 4.5 days. Only 0.75 gram remains of a sample that was initially 12 grams. How old is the sample of calcium-51? 4.5 days 9.0 days 13.5 days 18 days

Why does light change path when it changes mediums

A block of 250-mm length and 48 * 40-mm cross section is to support a centric compressive load P. The material to be used is a bronze for which E = 95 GPa.

Usually, it is observed that climates in coastal regions are moderate as compared to climates in the interiors of continents. Why is this so? A. Regions along the coast receive rain throughout the year; regions inland do not. B.

Jack has two boxes. One is 148g and one is 78g. If jack pushes both boxes with the same amount of force, which will accelerate faster? A. They will accelerate at the same rate, cause the same amount of force was applied B.

The energy stored in oil come from the sun. Describe how energy from the sun became stored in oil

The force of attraction exerted by non moving static charges in each other A) electrostatic force B) gravitational force C) electromagnetic force D) attractive force

Is the planet Jupiter magnetic. Yes or no

The number of spiders in the house and the outside air temperature have an indirect relationship. What will happen to the number of spiders in the house as the outside air temperature decreases?

A 1200 kg car is moving at 5.0 m/s east. it strikes an 1800 kg car at rest. the cars have an elastic collision and move in the east or west direction. the velocity of the 1200 kg car after the collision is:

Describe the movement of particles when water vapor touching cold surface