heey help plzA block measuring 20cm by 10cm by 4 cm rests on a flat surface. The block has a weight of 600g. Determine: (a)The minimum pressure it exerts on the surface. (3 Marks (b) The density of the block in kg/Take (g = 10N/kg . (3 Marks

a) 300 Pa

b) 750 kgm-³

Explanation:

P = F/A

Minimum pressure exerts when the largest area on the surface,

a) P = (0.6 × 10 ) / ( 20×10 × 10^-4)

= 300 Pa

b) D = m/v

= 0.6/ (20 × 10 × 4 × 10^-6)

= 750kgm^-3

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.