Label each of these as either tranverse or longitudinal. And either mechanical, or electromagnetic.
1 answer:
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Answer:
hmax= 28.2 m
Explanation:
Horizontal movement:
- For the horizontal movement, as once released, nothing exerts any influence on the ball in the horizontal direction, it will keep moving at a constant speed, so, the equation for the horizontal displacement is as follows:
x = v₀*t = 56.1523 m
Vertical movement:
- For the vertical movement, once thrown upward, the ball is under the sole influence of gravity, g, which causes the ball to accelerate downward, and which magnitude is 9.8 m/s².
- At any time, applying the definition of acceleration, we can find the value of the velocity, as follows:
- When the ball reaches to the maximum height, the ball will come momentarily at rest, so vf =0.
- At this point, we can find the time at which the ball reached to its highest point, as follows:
- In the same way, we can find the maximum height reached by the ball, just replacing this value of time in the equation for the displacement, in the vertical direction, as follows:
- Now, returning to the horizontal movement, as the time must be the same for both movements, we can replace the value for time we have just found, in the equation for the horizontal displacement:
- But as we know that vox = voy, we can rewrite the equation above as follows:
- We can solve for v₀, as follows:
- Now, we can replace this value in the expression for hmax, as follows:
Answer:
e.
Explanation:
- Assuming that the air resistance is neglectable, both bricks are only accelerated by gravity, which produces a constant acceleration on both bricks, which is the same, according Newton's 2nd Law, as we can see below:
- ⇒a = g = 9.8m/s² (pointing downward)
- Since acceleration is constant, if both fall from the same height, we can apply the following kinematic equation:
- Since both bricks are held off the edge, the initial speed is zero, so (2) reduces to the following equation:
- Since h (the height of the balcony) is the same, we conclude that both bricks hit ground at exactly the same time.
- If the air resistance is not negligible, due both bricks have zero initial speed, and have the same shape, they will be affected by the drag force in similar way, so they will reach the ground at approximately the same time.