9. A cannon launches a ball at 35 degrees to the horizontal. On level ground and

Question

9. A cannon launches a ball at 35 degrees to the horizontal. On level ground and neglecting air drag, to achieve the same horizontal range with the same lauacth speed, you could also set the cannon to launch at an angle of A. 90 degrees B. 45 degrees C. 55 degrees D.-35 degrees 10.A person is riding in an elevator, which is descending at constant speed. As measured by a bathroom seale placed under their feet, the normal force of the elevator floor acting on them A. is equal to C. is more than the person's weight. ????????????? B. is less than D. can be more or less than (depends on speed) csbel In addition to the

Explanation / Answer

9.

Rember that range of projectile motion is same for two angles when,

A1 + A2 = 90 deg

given that A1 = 35 deg

A2 = 90 - 35 = 55 deg

Correct option is C.

10.

Since given that elevator is descending at constant speed, which means accelerationis zero. So now net force on scale will be

Fnet = N - W = 0

N = W

So normal force will be equal to the person's weight.

Correct option is A.

Please Upvote.

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