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 56 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
Great answer, keep it coming :)

Kedrick2014

  • Member
  • Posts: 359
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.

Did you know?

Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

Did you know?

Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

Did you know?

The largest baby ever born weighed more than 23 pounds but died just 11 hours after his birth in 1879. The largest surviving baby was born in October 2009 in Sumatra, Indonesia, and weighed an astounding 19.2 pounds at birth.

Did you know?

This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

Shape changes in molecules Shape changes in molecules
DNA molecules replicate to form identical chromatids DNA molecules replicate to form identical chromatids
Daniel Burnham’s Flatiron Building (1902) was one of the first to use steel girders to hold up the b Daniel Burnham’s Flatiron Building (1902) was one of the first to use steel girders to hold up the b
A greater number of men than women hold full-time jobs, but the gap is closing because of an ... A greater number of men than women hold full-time jobs, but the gap is closing because of an ...
Relaxed and supercoiled DNA molecules Relaxed and supercoiled DNA molecules
Testing muscle strength using opposing force Testing muscle strength using opposing force
Video: DNA Replication Factory and Protein

For a complete list of videos, visit our video library