A car accelerates from rest at 6.6 m/s^2. How much time does it need to attain a speed of 7m/s?

Which of the following is an example of units for speed

Which accurately compares concave and convex lenses?

Panel bc in fig. p2.76 is semi-circular, with the 3 meter radius and horizontal straight edge through point b. compute (a) the hydrostatic force of the water on the panel, (b) its center of pressure, and (c) the moment of this force about point b. assume atmospheric pressure on the dry side of the panel