Answer:
The net force acting on the tennis ball while it is in contact with the racquet is 50.73 N
Explanation:
The impulse-momentum theorem said that the net impulse is equal to the change of the momentum, this is:
but the net impulse is too the net force times the change in time:
so using (2) on (1) we have:
Decomposing that on x and y components:
(See figure below) with Pfx = m*vfx= m*vf*cos(15°)=(0.058kg)(40m/s)cos(15°),
Pox = -m*vox= m*vo*cos(15°)=-(0.058kg)(30m/s)cos(15°), the same analysis to Pfy and Poy gives
Pfy=(0.058kg)(40m/s)sin(15°), Poy=-(0.058kg)(30m/s)sin(15°), using those values on (3) and (4) and solving for Fy and Fx:
So the net force acting on the tennis ball while it is in contact with the racquet is:
Answer:
Explanation:
A closed system is a system where exists energy interactions with surroundings, but not mass interactions. If we neglect any energy interactions from boundary work, heat, electricity, magnetism and nuclear phenomena and assume that process occurs at steady state and all effects from non-conservative forces can be neglected, then the equation of energy conservation is reduce to this form:
(1)
Where:
- Change in kinetic energy of the system, measured in joules.
- Change in gravitational potential energy of the system, measured in joules.
If we know that and , then we get the following equation:
(2)
Where and stands for initial and final states of each energy component.
Hence, the right answer is
Answer with Explanation:
"Wind" is abundant everywhere, thus it becomes one of the options for producing <em>electricity</em> in the world. Although it is said to be one of the cleanest sources, it also has an environmental impact on the society.
One of these is the amount of land that is being used when wind turbines are being installed. The wind turbines are the ones which allow the conversion of wind to electricity. Those that are located offshore require <u>bigger spaces. </u>
Another impact is <em>its threat to flying animals like birds and bats.</em> Some claim that these animals sometimes <em>collide with the wind turbines that spin causing their death.</em>
The wind turbines also produce noise pollution that <u>bothers residents who are living nearby. </u>
These are just some of the environmental impacts that occur when wind energy is converted into electricity.