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Nataly_w [17]
3 years ago
9

For which pair of launch angles will two identical projectiles have equal ranges?. A. 19.24°, 80.54°B. 16.42°, 74.58°C. 60.23°,

29.77°D. 89.53°, 01.47°E. 42.42°, 47.59°
Physics
2 answers:
AlladinOne [14]3 years ago
4 0
The kinematic equations of motion that apply here are<span>y(t)=votsin(θ)−12gt2</span>and<span>x(t)=votcos(θ)</span>Setting y(t)=0 yields <span>0=votsin(θ)−12gt2</span>. If we solve for t, we obtain, by factoring,<span>t=<span>2vsin(θ)g</span></span>Substitute this into our equation for x(t). This yields<span>x(t)=<span><span>2v2cos(θ)sin(θ)</span>g</span></span><span>This is equal to x=<span><span>v^2sin(2θ)</span>g</span></span>Hence the angles that have identical projectiles are have the same range via substitution in the last equation is C. <span> 60.23°, 29.77° </span>
enyata [817]3 years ago
4 0

The answer is C

If you subtract the given range of a projectile from 90º, It will give you its equivalent projectile counter part in terms of Range.

So, in this example where it gives you both the projectiles and asks you which ones that have the same range, add both and if it adds up to exaclt 90º, that is your answer

60.23º + 29.77º = 90º

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The correct question statement is :

A floor polisher has a rotating disk that has a 15-cm radius. The disk rotates at a constant angular velocity of 1.4 rev/s and is covered with a soft material that does the polishing. An operator holds the polisher in one place for 4.5 s, in order to buff an especially scuff ed area of the floor. How far (in meters) does a spot on the outer edge of the disk move during this time?

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