They land at the same time Save 4.C.2 Submit 4.C2 (1/1 submissions ased) Section

Question

They land at the same time Save 4.C.2 Submit 4.C2 (1/1 submissions ased) Section 0: Introduction t4.0.2 Use the simulation in the cannon interactive in Section 4.0 to answer the 10 flowing (1.00) following questions. (a) Does the cannonball's horizontal velocity change as it moves through the air? (b) Does its vertical velocity change? (c) If you increase the cannonball's horizontal velocity, does it stay in the air longer, the same amount of time, or shorter? (d) Who is inside the left haystack? (a) O Yes O No (0/1 submissio (b) O Yes No (0/1 submissions 0/1submissions used (0/1 submiSSionS US ubmit 4.0.2 S Longer The same Seci in two dimensions Shorter An airplane is flying horizontally at 115 m/s, at a 20.5 degree angle north of are in the positive direction. (M 107/7 4.2.3 (1.00) east. State its velocity in rectangular coordinates. Assume that north and east /2 submissions used) , v 403 submissions

Explanation / Answer

4.0.2)

A cannon ball can be modelled as a projectile. Based on the motion of a projectile the given questions can be answered.

(a)No

the horizontal velocity of the projectile remains contant through out the motion of the projectile.

(b)Yes

The vertical velocity changes. it becomes zero at the highest point and then the projectile begins to accelerate down with acceleraion equal to g.

(c)The same

The time for which the projectile is airborne depends upon the vertical velocity not the horizontal velocity.

t = 2 vy/g = 2 vi sin(theta)/g

As discussed in (a)the horizontal velocity(vx = vi cos(theta) can not be changed if one need to change the horizontal velocity then the intial speed of the projectile or the angle at which it is fired has to be changed.

(d)This question is completely based on the simulation. (more information needed for this)

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