A radioactive isotope of the element potassium decays to produce argon. If the ratio of argon to potassium is found to be 31:1, how many half-lives have occurred?

Do mirrors reflect light

How much work is done on a a 60 n box of books that you carry horizontally across a 6 m room?

a rocket blasts off and moves away (distance is increasing) form earth. how is the rocket affected by the earths gravitational pulls as it moves further away?

How dense the medium is in the compression part of the wave, and how

A projectile is launched at an angle with the horizontal. Which statement is true about its motion when it is travelling upward? A. The magnitude of the horizontal velocity increases. B. The magnitude of the vertical velocity remains constant. C.

As stream velocity decrease, which factor will likely increase? A) erosion of the stream bank B) deposition of material in the stream C) amount of material carried downstream D) size of the particles carried downstream

What cells in the nervous signals travel through the nervous system

A mechanic pushes a 3.60 ✕ 103-kg car from rest to a speed of v, doing 5,130 j of work in the process. during this time, the car moves 21.0 m. neglecting friction between car and road, find v and the horizontal force exerted on the car.

Anika asks Eva to roll a basketball and then a bowling ball to her. Which requires more force to roll, and why?

Why does a buoyant force act on every object in a fluid? Pressure pushing up on the bottom of the object is greater than the pressure pushing down on the top.