Ablock slides on a table pulled by a string attached to a hanging weight. in case 1 the block slides without friction and in case 2 there is kinetic friction between the sliding block and the table. in which case is the tension in the string the biggest? explain.

In case 2

Explanation:

Thinking process:

The friction is a force that tends to oppose motion.

In case 1, the block slides without friction. This means that the surface is a smooth surface. Thus, the net force needed to pull the string is minimal.

In case 2, there is kinetic friction between the sliding block and the table. Now, the kinetic friction is given by the formula:

where, = coefficient of friction and N = normal force.

Thus, the net force needed:

Thus, the force is larger in case 2.

Therefore, the tension is larger in case 2.

explanation:

earth's surface is mainly heated by the absorption of infrared radiation from the sun.

evaporation occurs because molecules in liquid water are warmed ( usually by the sun) and vibrate quicker, becoming less dense and rise.

condensation occurs because molecules in water vapor are cooled and therefore vibrate more slowly thus becoming more dense and eventually fall to earth.

lines of equal barometric pressure on a weather map are called: isobars : lines of equal temp on a weather map are called: isotherms.​

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explanation: