A cannonball is shot from a cannon at a launch angle of 35 and an initial velocity of 147 m/s. The gravitational acceleration is -9.8 m/s^2. Assuming NO air resistance, how long will it take the cannonball to reach the peak of its trajectory? A.)9.8 s
B.)40.2 s
C.)26.7 s
D.)8.6 s

Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.

If gases like carbon dioxide and methane make up less than 1% of the total atmosphere, why is it important for scientists to monitor changes in percentages of these gases?

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