The work done to a 300 gram baseball as it is hit is equal to 1800 J. When the ball is hit, 200 J of energy is released as sound energy (not KE). The ball is hit at a 30° angle into the air and
travels as a projectile. For 5 bonus points, calculate the initial velocity of the ball as it leaves the
bat. For another 5 points, find the gravitational potential energy of the baseball when it reaches
the highest point in its flight (ignore air resistance)? You may need to incorporate what we know
about projectile motion.

Apositive rod is placed to the left of sphere a, and the spheres are separated. which best describes the spheres? sphere a is negative and sphere b is positive because protons from sphere a are attracted to the rod and move to sphere b. sphere a is negative and sphere b is positive because electrons from sphere b are attracted to the rod and move to sphere a. sphere a is positive and sphere b is negative because electrons from the rod move to sphere b and protons then move to sphere a. sphere a is positive and sphere b is negative because protons move from sphere b to the rod and also to sphere a.

How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?