need help!! In the first law of thermodynamics, ΔE=Q−W , what does Q stand for? the work done by the piston the heat added to the system the change in the internal energy of the system the internal energy of the system

Aball is thrown horizontally from a cliff at 8m/s .in what direction is the ball moving 2s later?

Aball is thrown from the top of a building with an initial velocity of 21.9 m/s straight upward, at an initial height of 51.6 m above the ground. the ball just misses the edge of the roof on its way down, as shown in the figure. (a) determine the time needed for the ball to reach its maximum height. (b) determine the maximum height. (c) determine the time needed for the ball to return to the height from which it was thrown, and the velocity of the ball at that instant. (d) determine the time needed for the ball to reach the ground. (e) determine the velocity and position of the ball at t = 5.35 s.

Atorque acting on an object tends to produce a. equilibrium b. rotation c. linear motion d. velocity e. a center of gravity