What happened to a apple's weigh as the plane rose up toward the sky?

1 answer:

5 0

Okay, I don't know if this question is supposed to be a trick question or not. The weight of the apple does not change as the plane travels up the atmosphere, but the MASS changes. Weight doesn't change no matter what environment you're in, but the mass changes in different environments. In this case, the weight is constant but the mass is decreasing as you go higher up.

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A box is initially sliding across a frictionless floor toward a spring which is attached to a wall. the box hits the end of the

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The elastic potential energy of a spring is given by
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$W=-\Delta U = \frac{1}{2}kx_i^2 - \frac{1}{2}kx_f^2$

In our problem, initially the spring is uncompressed, so $x_i=0$ . Therefore, the work done by the spring when it is compressed until $x_f$ is
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And this value is actually negative, because the box is responsible for the spring's compression, so the work is done by the box.

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