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Chapter 1: Q13CP (page 23)

comet travels in an elliptical path around a star, in the direction shown in Figure 1.41. Which arrow best indicates the direction of the comet鈥檚 instantaneous velocity vector at each of the numbered locations in the orbit?

Short Answer

Expert verified

The direction of instantaneous velocity:

Location1: Arrow a

Location2: Arrow h

Location3: Arrow g

Location4: Arrow f

Location5: Arrow e

Step by step solution

01

Definition of Direction of instantaneous velocity

At any moment in time, the direction of instantaneous velocity determines the direction of motion of a particle.It is always tangent to the path of the object.

02

Direction of instantaneous velocity

Going by the definition, the arrows that match the direction of motion are:

Location 1 : In this case, the direction of motion is towards the north. The arrow which indicates the direction of motion properly is Arrow 鈥榓鈥�.

Location 2 : In this case, the direction of motion is in the northeast direction. The arrow which indicates the direction of motion properly is Arrow 鈥榟鈥�.

Location 3 : In this case, the direction of motion is towards the west. The arrow which indicates the direction of motion properly is Arrow 鈥榞鈥�.

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Most popular questions from this chapter

Question: In the periodic table on the inside front cover of this book (or one you find on the internet), for each element there is given the "atomic number," the number of protons or electrons in an atom, and the "atomic mass," which is essentially the number of nucleons, protons plus neutrons, in the nucleus, averaged over the various isotopes of the element, which differ in the number of neutrons. Make a graph of the number of neutrons vs. the number of protons in the elements. You needn't graph every element, just enough to see the trend. What do you observe about the data? (This reflects the need for more neutrons in proton-rich nuclei in order to prevent the electric repulsion of the protons of each other from destroying the nucleus.)

If F1鈬赌=<300,0,-200>and F2鈬赌=150,-300,0 , calculate the following

If and , calculate the following:(a) F1鈬赌+F2鈬赌(b)|F1鈬赌+F2鈬赌|(c)|F1鈬赌+F2鈬赌|(d)|F1鈬赌+F2鈬赌|=|F1鈬赌|+|F2鈬赌|?(e)F鈬赌1-F2鈬赌(f)|F1鈬赌-F2鈬赌|(g)|F1鈬赌|-|F2鈬赌|(h)Is|F1鈬赌-F2鈬赌|=|F1鈬赌|-|F2鈬赌|?

A "cosmic-ray" proton hits the upper atmosphere with a speed 0.9999c, where c is the speed of light. What is the magnitude of the momentum of this proton? Note that |v鈫�|/c=0.9999; you don't actually need to calculate the speed|v|.

(a) A unit vector lies in the plane, at an angle of from theaxis, with a positivecomponent. What is the unit vector? (It helps to draw a diagram.) (b) A string runs up and to the left in theplane, making an angle of to the vertical. Determine the unit vector that points along the string.

If F鈫�1=300,0,-200and F鈫�2=-150,300,0, calculate the following quantities and make the requested comparisons: (a) F鈫�1+F鈫�2(b) F鈫�1+F鈫�2(c) F鈫�1+F鈫�2(d) Is F鈫�1+F鈫�2=F鈫�1+F鈫�2(e) F鈫�1-F鈫�2(f) F鈫�1-F鈫�2(g) F鈫�1-F鈫�2(h) IsF鈫�1-F鈫�2=F鈫�1-F鈫�2?
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