Any substance that yields a hydrogen ion when placed in a water solution is called

a.)acid
b.)base
c.)hydronium ion
d.)hydroxide ion

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s

The least penetrating form of radiation is