In the first law of thermodynamics, the Q stands for heat.
delta E is the change in internal energy of a closed system is equal to the amount of heat (Q) in the system minus the amount of work done (W).
0 Km , Displacement is distance from starting point. Not distance of Journey.
Answer:
1) Skis have a large area to reduce the pressure on the snow. This ensures that the skis do not sink into the snow too far.
2) The pressure under the studs on the soles of football shoes is high enough for them to sink into the ground, which gives extra grip.
3) A vacuum cleaner has a fan inside that creates a low pressure inside the device. Consequently, air and dirt particles are sucked into the device.