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4 years ago

Which of the following is true for projectile motion?

2 answers:

8 0

The answer to this question is B, C, and D
A is not true because all projectiles have 3 dimensions

I hope this helps!!!!!!!!!

stich3 [128]4 years ago

8 0

Answer:

When an object experiences gravity as the only force upon it is described as being in projectile motion; gravity causes vertical acceleration; all projectiles have 3 dimensions, while horizontal and vertical motions are independent of each other, and its acceleration is constant. From the options above, the most suitable ones are A. B. and C.

Explanation:

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The maximum tension that a 0.80 m string can tolerate is 15 N. A 0.35-kg ball attached to this string is being whirled in a vert

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Answer:

v=5.86 m/s

Explanation:

Given that,

Length of the string, l = 0.8 m

Maximum tension tolerated by the string, F = 15 N

Mass of the ball, m = 0.35 kg

We need to find the maximum speed the ball can have at the top of the circle. The ball is moving under the action of the centripetal force. The length of the string will be the radius of the circular path. The centripetal force is given by the relation as follows :

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$v=\sqrt{\dfrac{Fr}{m}} \\\\v=\sqrt{\dfrac{15\times 0.8}{0.35}} \\\\v=5.86\ m/s$

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3 years ago

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A girl is sitting in a sled sliding horizontally along some snow (there is friction present).

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Answer:

159 N

Explanation:

The force of friction is a resistive force that acts against an object in motion (or on the verge of moving).

There are two types of force of friction:

Force of static friction: it occurs when the object is still at rest
Force of kinetic friction: it occurs when the object is sliding on a surface and it is in motion

In this problem, we are in the 2nd situation, so we want to calculate the force of kinetic friction.

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