This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: A force of 5.3 N is needed to hold on to an umbrella in a strong wind. If the air molecules each ... (Read 58 times)

formula1

  • Hero Member
  • *****
  • Posts: 666
on: Jul 29, 2018
A force of 5.3 N is needed to hold on to an umbrella in a strong wind. If the air molecules each have a mass of 4.7 10-26 kg,
 
  and each one strikes the umbrella (without rebounding) with a speed of 2.0 m/s in the same direction, how many molecules strike the umbrella each second? Assume that the wind blows horizontally so that the gravitational force exerted on the air molecules can be neglected.

Question 2

A spherical ball of lead (density 11.3 g/cm3 ) is placed in a tub of mercury (density 13.6 g/cm3 ). Which answer best describes the result?
 
  A) The lead ball will float with about 17 of its volume above the surface of the mercury.
  B) The lead ball will float with about 83 of its volume above the surface of the mercury.
  C) The lead will sink to the bottom of the mercury.
  D) The lead ball will float with its top exactly even with the surface of the mercury.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

mjenn52

  • Sr. Member
  • ****
  • Posts: 351
Reply #1 on: Jul 29, 2018
Answer to Question 1

5.6 1025 per second

Answer to Question 2

A


formula1

  • Member
  • Posts: 666
Reply 2 on: Jul 29, 2018
YES! Correct, THANKS for helping me on my review

aruss1303

  • Member
  • Posts: 314
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

Human kidneys will clean about 1 million gallons of blood in an average lifetime.

Did you know?

Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

Did you know?

Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.

Did you know?

Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

Did you know?

Individuals are never “cured” of addictions. Instead, they learn how to manage their disease to lead healthy, balanced lives.

water molecules water molecules
Nuclear bodies are differentially permeable to molecules in the bulk nucleoplasm Nuclear bodies are differentially permeable to molecules in the bulk nucleoplasm
Measuring Wind Measuring Wind
A forklift pushes a 100-kg crate, starting from rest, exerting a horizontal force of magnitude ... A forklift pushes a 100-kg crate, starting from rest, exerting a horizontal force of magnitude ...
How many milliliters of 13.2 M H2SO4 are needed to prepare 600.0 mL of 0.10 M H2SO4? How many milliliters of 13.2 M H2SO4 are needed to prepare 600.0 mL of 0.10 M H2SO4?
Flowering plants such as papayas hold on to their spores and disperse by releasing seeds enclosed in Flowering plants such as papayas hold on to their spores and disperse by releasing seeds enclosed in
Video: Types of Shock (Part 2 of 2)

For a complete list of videos, visit our video library