Which of the following best explains the scenario below? On a summer morning, Mrs. Houser walks barefoot across her paved driveway with no problem. However, later that afternoon she steps barefoot onto the same driveway and must quickly run off because the bottoms of her feet feel like they are burning.

Choose the best explanation for this scenario:

Question 3 options:

As the temperature increased during the day, the particles in the pavement moved faster and the thermal energy decreased.

As the temperature increased during the day, the particles in the pavement moved faster and the thermal energy increased.

As the temperature increased during the day, the particles in the pavement moved slower and the thermal energy increased.

As the temperature increased during the day, the particles in the pavement moved slower and the thermal energy decreased.

2b2t

explanation:

2b2t

answer7,570,82356 cubic centimeters;

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.