When approaching a stopped car, an officer must be aware of various dangers such as an armed person inside or outside the car.
<h3>What is a danger?</h3>
A danger is a term that refers to a situation in which life, health, property, or the environment is threatened. It is characterized by the feasibility of the occurrence of a potentially harmful incident.
<h3>What dangers does an officer have with a stopped car?</h3>
When an officer sees a suspicious car stopped, she/he must be very careful when approaching it because there may be several dangers that threaten her/his life and her/his health. Some of these dangers can be caused by other people. There may also be danger in the car or other factors such as animals.
Some examples of dangers to officers when approaching a stopped car are:
- The person inside the car is armed and is trying to shoot or hit the officer.
- That the car be used as a decoy for the officer to approach and approach him from behind her.
- That the car contains dangerous elements such as chemicals, explosives or inflammables that could put the officer at risk.
- That under the car there is a dangerous animal such as a swarm of bees, a snake, scorpions, among others.
Therefore, the officer must remain calm, act carefully and approach slowly to be able to react to any movement.
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Answer - Race as a categorizing term referring to human beings was first used in the English language in the late 16th century. Until the 18th century it had a generalized meaning similar to other classifying terms such as type, sort, or kind. Occasional literature of Shakespeare’s time referred to a “race of saints” or “a race of bishops.” By the 18th century, race was widely used for sorting and ranking the peoples in the English colonies—Europeans who saw themselves as free people, Amerindians who had been conquered, and Africans who were being brought in as slave labour—and this usage continues today.
The peoples conquered and enslaved were physically different from western and northern Europeans, but such differences were not the sole cause for the construction of racial categories. The English had a long history of separating themselves from others and treating foreigners, such as the Irish, as alien “others.” By the 17th century their policies and practices in Ireland had led to an image of the Irish as “savages” who were incapable of being civilized. Proposals to conquer the Irish, take over their lands, and use them as forced labour failed largely because of Irish resistance. It was then that many Englishmen turned to the idea of colonizing the New World. Their attitudes toward the Irish set precedents for how they were to treat the New World Indians and, later, Africans.
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Answer: All that is necessary to create lift is to turn a flow of air. The airfoil of a wing turns a flow, and so does a rotating cylinder. A spinning ball also turns a flow and generates an aerodynamic lift force.
The details of how a spinning ball creates lift are fairly complex. Next to any surface, the molecules of the air stick to the surface, as discussed in the properties of air slide. This thin layer of molecules entrains or pulls the surrounding flow of air. For a spinning ball the external flow is pulled in the direction of the spin. If the ball is not translating, we have a spinning, vortex-like flow set up around the spinning ball, neglecting three-dimensional and viscous effects in the outer flow. If the ball is translating through the air at some velocity, then on one side of the ball the entrained flow opposes the free stream flow, while on the other side of the ball, the entrained and free stream flows are in the same direction. Adding the components of velocity for the entrained flow to the free stream flow, on one side of the ball the net velocity is less than free stream; while on the other, the net velocity is greater than free stream. The flow is then turned by the spinning ball, and a force is generated. Because of the change to the velocity field, the pressure field is also altered around the ball. The magnitude of the force can be computed by integrating the surface pressure times the area around the ball. The direction of the force is perpendicular (at a right angle) to the flow direction and perpendicular to the axis of rotation of the ball.
On the figure at the left, we show the geometry of the spinning ball. A ball of radius b rotates at speed s measured in revolutions per second. A black dashed line indicates the axis of rotation of the ball, and the ball rotates clock-wise, when viewed along the axis from the lower left. The ball has been sliced into a large number of grey-colored sections along the axis of rotation. The air with velocity V and density rho strikes the ball from the upper left. The resulting lift force L is perpendicular to the air velocity and the axis of rotation.
To determine the ideal lift force on the ball, we consider the spinning ball to be composed of an infinite number of very small, grey-colored, rotating cylinders. Adding up (integrating) the lift of all of the cylinders along the axis gives the ideal lift of the ball.
The Kutta-Joukowski lift theorem for a single cylinder states the lift per unit length L is equal to the density rho of the air times the strength of the rotation Gamma times the velocity V of the air.
It is the only former european colony in the southern hemisphere
