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Whitepunk [10]
3 years ago
8

A 1.0 kg rock moving at 8.4 m/s will have ______ of kinetic energy

Physics
1 answer:
BlackZzzverrR [31]3 years ago
4 0
K.E=1/2mv^2 K.E=1/2multiply1multiply8^2=32joules
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Water is a polar molecule

Explanation:

The general solubility rule is that like dissolves like. In short, polar solutes would dissolve in polar solvents. Non polar solutes also dissolves on non polar solvents.

NaCl is an ionic molecule which forms as a result of transfer of electrons from one atom to another. The transfer of electrons makes the atoms oppositely a charged ions and they become polar.

Water is made up of Hydrogen H⁺ ions and hydroxy ions OH⁻. Water is an heteronuclear covalent molecule. Here, there is an unequal sharing of electrons as one atom pulls the shared electron more closer. This leaves a partial negative charge on the more electronegative atom and a partial positive charge on the other.

This polar nature of water NaCl makes dissolution easy.

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Which of these determines an objects ability to sink or float in water?
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Answer:

C. Density

Explanation:

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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
U= \frac{1}{2}kx^2
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The work done by the spring is the negative of the potential energy difference between the final and initial condition of the spring:
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
W=- \frac{1}{2}kx_f^2
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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