4. + 1 points SerEssen1 3.P020.AF My Notes Ask Your Teacher An artillery shell i

Question

4. + 1 points SerEssen1 3.P020.AF My Notes Ask Your Teacher An artillery shell is fired with an initial velocity of 300 m/s at 45.5 above the horizontal. To clear an avalanche, it explodes on a mountainside 35.0 s after firing. What are the x and y coordinates of the shell where it explodes, relative to its firing point? Hint: Active Figure 3.15 5. 1 points SerEssen1 3.P042.AF My Notes Ask Your Teacher A ball is thrown straight upward and returns to the thrower's hand after 2.90 s in the air. A second ball is thrown at an angle of 33.0° with the horizontal. At what speed must the second ball be thrown so that it reaches the same height as the one thrown vertically? m/s Hint: Active Figure 3.15

Explanation / Answer

4.

Initial Horizontal and vertical components of velocity is

Vox=300cos45.5=210.27 m/s

Voy=300sin45.5=213.98 m/s

Final horizontal velocity is

Vfx=Vox=210.27 m/s

Horizontal distance

X=Vfxt=210.27*35

X=7359.6 m

Vertical distance

Y=Yo+Voyt-(1/2)gt2=0+213.98*35-(1/2)*9.8*352

Y=1486.6 m

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