« previous next »

Author Question: On sunny days, why do hot-air balloons suddenly rise when they drift over a wide road or a black ... (Read 62 times)

debasdf

  • Hero Member
  • *****
  • Posts: 570
on: Jul 29, 2018
On sunny days, why do hot-air balloons suddenly rise when they drift over a wide road or a black asphalt parking lot?
 
  What will be an ideal response?

Question 2

In one word, account for water temperature exceeding 100C in the power plant of a nuclear submarine.
 
  A) conductivity
  B) evaporation
  C) condensation
  D) pressure
  E) vaporization


amandanbreshears

  • Sr. Member
  • ****
  • Posts: 320
Reply #1 on: Jul 29, 2018
Answer to Question 1

Answer: Air over a warm surface is warmed, becomes less dense, and is buoyed upward. That is why air warmed by a hot black surface rises. Hence a balloon is carried upward by the rising air.

Answer to Question 2

Answer: D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Automated pill dispensing systems have alarms to alert patients when the correct dosing time has arrived. Most systems work with many varieties of medications, so patients who are taking a variety of drugs can still be in control of their dose regimen.

Did you know?

Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).

Did you know?

More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.

Did you know?

According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.

Did you know?

Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

This Black-browed Albatross has been hooked on a long-line. This Black-browed Albatross has been hooked on a long-line.
snout is just over 100 microns wide snout is just over 100 microns wide
Seven black members of Congress in 1871 are from left to right: Senator Hiram Revels (R-MS) and Repr Seven black members of Congress in 1871 are from left to right: Senator Hiram Revels (R-MS) and Repr
Kazimir Malevich, Black Square. Kazimir Malevich, Black Square.
The Rise and Fall of Separation Anxiety The Rise and Fall of Separation Anxiety
Development of the Eyes and Ears: External View - 28 days Embryo Development of the Eyes and Ears: External View - 28 days Embryo
Video: Enzyme structure - Properties of enzymes

For a complete list of videos, visit our video library