Because the speed is constant, then that means it's not accelerating. If it's not accelerating, the force is balanced, so the net force is always zero. The frictional force is the same as the force applied. Which is 85N.
An electric motor converts electrical energy into physical movement. Electric motors generate magnetic fields with electric current through a coil. The magnetic field then causes a force with a magnet that causes movement or spinning that runs the motor.
D. It can melt to a depth of a few meters in summer, then refreeze in winter.
Explanation:
Permafrost can melt to a depth of a few meters in summer and then refreeze in winter. Permafrost is soil or ground that remains frozen for at least two years.
- They occur at high latitude regions where temperature is usually below that of freezing point.
- Permafrost are usually a few meters deep and do not extend as deep as 1500km. This is the depth of the mantle.
- Columnar joints are produced by differential cooling of volcanic rocks and not hexagonal patterns of freezing and thawing melt.
- Permafrost can be found in periglacial area.
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Answer:
He proposed that matter can be converted to energy and vice versa. He first discovered that nuclear-reaction products are lighter than the reactants. He developed the use of nuclear reactions to generate electricity
Explanation:
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Involves changes in nuclear structure, such as fission of a nucleus or an atom.
