1. How do you find the electric field strength, and how to draw the electric field lines? 2. What is the electric force on object?

3. a=?

4. How do you find the maximum height and time spent to reach max height?

5. What is the range?

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

What is the coefficient of kinetic friction μk between the block and the tabletop?

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?