A player kicks a football from ground level with an initial velocity of 27.0 m/s, 30.0° above the horizontal, as shown in the figure. Assume that forces from the air on the ball are negligible.
Find the ball's hang time (time of flight).

Two trains leave a station at the same time, train a travels at a constant speed of 16 m/s. train b starts at 8.0 m/s but accelerates constantly at 1.0 m/s squared. after 10.0 seconds, which train has the greater speed?

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.

There are 3 ways heat can be transferred: through solids, called , through liquids and gases , called , and through electromagnetic waves, called