Physics, 23.12.2020 04:50, flores1717
A golf ball with a mass of 46g is hit from the ground with a speed of 20m/s. It takes that ball 1 second to reach its highest point. For all parts assume that the air resistance is negligible. The system includes the golf stick, golf ball, and Earth. I created an energy bar chart attached below. The part where I'm getting stuck is figuring out what is doing the negative work. At first I thought it was the Earth but it can't be because it is part of the system. Then I started doubting my energy bar chart. The final Ug would be mgh so I did m=0.046(covert from g to kg), g=-10, and h=5(figured out using kinematics). The Ug would then be -2.3. But wouldn't it have to be positive 2.3 for energy to be conserved? But at the same time, how can it be positive; g is always negative? So please clear up this problem, I've been stressing on it too much.
Answers: 3
Physics, 22.06.2019 13:50, heatherlemaster
The magnitude of the poynting vector of a planar electromagnetic wave has an average value of 0.939 w/m^2 . the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. how much total electromagnetic energy falls on the area during 1.0 minute?
Answers: 2
Physics, 23.06.2019 02:50, spookymod8967
Aweather balloon has a volume of 52.5 liters at a temperature of 252 k. the balloon is released and rises to an altitude where the temperature is 295 k. how does this temperature change affect the gas particle motion?
Answers: 1
A golf ball with a mass of 46g is hit from the ground with a speed of 20m/s. It takes that ball 1 se...
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