If the electric force between two charges is 4.2 x 10-2 N, what would the new force be if the distance between the charges is doubled and the charge on one of the
charges is tripled?

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

We have a colorless transparent liquid. it looks like water. we seperated it into a solid and a liquid by evaporration and condention was this a chemichal or a physical seperation a. chemical seperation b. physical seperation

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