What is the amount of NH4Cl that will dissolve at 20C for form a saturated solution? 10 20
30
40

What is the measurement of how fast an object moves relative to a reference point?

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

Write down two additional questions about earth's magnetic field that will make your presentation more informative.