Physics, 20.04.2021 14:20 shadow29916
The Earth, and everything on it rotates counterclockwise, if viewed from space above the north pole. That means everything on it is also rotating. We donāt feel the rotation because we donāt have any immediate reference points. If we were in a soundproof car moving at a constant speed with the windows blacked out, we wouldnāt know we were moving, because we have no reference. The only reference we have the are the stars, but they "move" so slow they are of little immediate use, with the exception of the sun. But as we all know, many people thought the sun moved around the Earth rather than vice versa. Because of Earthās rotation, atmospheric molecules move as well, but they are lighter, and thus freer than we are to move; this gives rise to weather patterns and phenomena such as jet streams. Jet streams are high altitude air currents that often arise between the troposphere and stratosphere -- where jet airplanes often fly. The jet streams flow in the direction of Earthās rotation, that is, to the East. This is why it takes less time to travel to Europe from the US, than vice versa or east across the US versus west.
Consider a plane travelling from Chicago, Il to Rome, Italy at a speed of 800. km/h relative to the air (airspeed). In perfectly still air, the planeās airspeed is equal to its ground speed: the speed it would have on the ground. If the plane is flying in a parallel 100. km/h jet stream for 7,700. km (the majority) of its trip in air kilometers (because the plane must fly farther at higher altitudes),
1) how long (in hours) would the the trip take?
a) If the plane flies back under the same conditions, how long would the trip take
b) If the jet stream is angled at 30.0 degrees north of the planeās fuselage from Rome to Chicago, how long would the trip take?
C) By what angle would the pilot need to correct the aircraft to maintain course? Hint: You can calculate this either with vectors, or geometry.
D) If the pilot did not correct the planeās trajectory for the partial crosswind, how far off course would the plane be if it travelled for 7700 km?
Answers: 3
Physics, 22.06.2019 06:00
The frequency of vibrations of a vibrating violin string is given by f = 1 2l t Ļ where l is the length of the string, t is its tension, and Ļ is its linear density.ā (a) find the rate of change of the frequency with respect to the following. (i) the length (when t and Ļ are constant) (ii) the tension (when l and Ļ are constant) (iii) the linear density (when l and t are constant) (b) the pitch of a note (how high or low the note sounds) is determined by the frequency f. (the higher the frequency, the higher the pitch.) use the signs of the derivatives in part (a) to determine what happens to the pitch of a note for the following. (i) when the effective length of a string is decreased by placing a finger on the string so a shorter portion of the string vibrates df dl 0 and l is ā f is ā (ii) when the tension is increased by turning a tuning peg df dt 0 and t is ā f is ā (iii) when the linear density is increased by switching to another string df dĻ 0 and Ļ is ā f is ā
Answers: 3
Physics, 22.06.2019 10:10
In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the corneaās vertex is focused on the retina?
Answers: 1
Physics, 22.06.2019 12:00
This is for my 8th grade science class, i really donāt understand. can someone me? , lol.
Answers: 1
Physics, 22.06.2019 12:30
An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.
Answers: 2
The Earth, and everything on it rotates counterclockwise, if viewed from space above the north pole....
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