100 J of work was done to lift a 10-N rock and set it at Position A near the edge of a cliff. 1. If the 100 Joules of work lifted the rock to the top of the cliff, how much potential energy did the rock gain?

2. At point C, the rock’s potential energy will be _.

3. The rock’s kinetic energy at point A is _.

4. At point B, some of the rock’s potential energy will be changed to _ energy.

5. What is the mass of the rock?

6. What is the rock’s velocity just before it hits the ground?

Abatter hits the baseball a with an initial velocity of v0 = 110 ft/sec directly toward fielder b at an angle of 23° to the horizontal; the initial position of the ball is 2.2 ft above ground level. fielder b requires 0.44 sec to judge where the ball should be caught and begins moving to that position with constant speed. because of great experience, fielder b chooses his running speed so that he arrives at the “catch position” simultaneously with the baseball. the catch position is the field location at which the ball altitude is 8.4 ft. determine the velocity of the ball relative to the fielder at the instant the catch is made.

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

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?