Best answer gets BRAINLIEST 1. Explain why materials such as plastic foam, feathers, and fur are poor conductors of heat.
2. Explain why the sand on a beach cools down at night more quickly than the ocean water.
3. Infer If a substance can contain thermal energy, can a substance also
contain heat?
4. Describe how heat is transferred from on place to another by convection.
5. Explain why a blanket keeps you warm.
6. Think Critically in order to heat a room evenly, should heating vents be placed near the floor or near the ceiling of the room? Explain.

1: plastic are poor conductor BC oz they allow heat to pass through

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j

the answer is 1 i believe