1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
xeze [42]
3 years ago
13

A 2-ft-thick block constructed of wood (sg = 0.6) is submerged in oil (sg = 0.8), and has a 2-ft-thick aluminum (specific weight

= 168 lb/ft3) plate attached to the bottom as indicated in fig. p2.146. (a) determine completely the force required to hold the block in the position shown. (b) loca

Physics
1 answer:
solong [7]3 years ago
6 0
Refer to the figure shown below.

Assume that
g = 32 ft/s², acceleration due to gravity
ρ = 62.4 lb/ft³, density of water
A = 1 ft², the surface area of each of the blocks.

Calculate the weight of the wooden block (sg = 0.6).
W₁ = (0.6*62.4 lb/ft³)*(2 ft³) = 74.88 lb
Calculare the weight of the aluminum block (sg = 0.8)
W₂ = (0.8*62.4)*(2) = 99.84 lb

Use the Archimedes Principle to calculate buoyant forces.
For the wooden block,
B₁ = (62.4 lb/ft²)*(2 ft³) = 124.8 lb
Also, for the aluminum block,
B₂ = 124.8 lb

Let F = the force required to hold the blocks in position. Then
-F + B₁ + B₂ = W₁ + W₂
-F + 249.6 = 174.72
F = 74.88 lb

The answer for Part (a):   
74.88 lb, acting downward.

Forces W₁, B₁ act at the center of mass of the wooden block, and W₂, B₂ act at the center of mass of the aluminum block.
Let x =  the location of the overall force on the two blocks, measured downward from the top of the wooden block, as shown in the figure.
Then
(W₁ - B₁)*(1.0) + (W₂ - B₂)*(3.0) = (W₁+W₂-B₁-B₂)*x
-49.92 + (-24.96)*(3) = -74.88x
-124.8 = -74.88x
x = 1.668 ft

The answer for part (b): 
The resultant force should be applied at 1.67 ft below the top of the wooden block.

You might be interested in
The revival of the atomic concept was catalyzed by what experimental observation?
IgorC [24]
It seems that you have missed the necessary options for us to answer this question so I had to look for it. Anyway, here is the answer. The revival of the atomic concept was catalyzed by the experimental observation which is Constant <span>composition in compounds. Hope this helps.</span>
5 0
3 years ago
If planet A is three times as far from planet C, then the period of its orbit will be __ times as long
liubo4ka [24]
I may be wrong, but I think you're trying to say that Planet-A is
<em>3 times as far from the sun</em> as Planet-C is.

If that's the real question, then the answer is that the period of Orbit-A
is about<em>  5.2</em>  times as long as the period of Orbit-C .

Orbital period ≈ (proportional to) (the orbital distance) ^ 3/2 power.

This was empirically demonstrated about 350 years ago by Johannes
and his brilliant Kepple, and derived about 100 years later by Newton
from his formula for the forces of gravity.


6 0
2 years ago
Identify the following physical quantities as scalars or vectors.
34kurt
Position displacement velocity acceleration are vectors and the rest are scalars
6 0
3 years ago
Read 2 more answers
What problems do pathogens cause in our society?
kotegsom [21]

Pathogens are microorganisms that cause infectious diseases. Bacteria and viruses are the main pathogens in the world today.

The major problem that pathogen cause in society is that they are the agents of infection and disease. 

An infection results when a pathogen invades the body and begins growing within a host.  A disease results when tissue function is impaired due to an infection.

Due to diseases, affected people can not work  which negatively affects the economy, and the sick may end up dying causing a lot of grief, and robbing society of a father, a mother or child.

The government has to put money aside for health care which would otherwise have been used for other things to help the society.

3 0
2 years ago
If the radio waves transmitted by a radio station have a frequency of 76.5 mhz, what is the wavelength of the waves, in meters?
____ [38]
Given: Velocity of light    c = 3.00 x 10⁸ m/s

Frequency f = 7.65 x 10⁷/s

Required: Wavelength λ = ?

Formula:  λ = c/f

λ = 3.00 x 10⁸ m/s/7.65 x 10⁷/s

λ = 3.92 m
3 0
2 years ago
Other questions:
  • A 450-kg sports car accelerates from rest to 100 km/h in 4.80 s. what magnitude force does a 68.0 kg passenger experience during
    10·1 answer
  • A bat strikes a 0.145 kg baseball. Just before impact, the ball is traveling horizontally to the right at 40.0 m/s; when it leav
    10·1 answer
  • Identity the kinds of force in the following activities<br> A lemon falls from the tree to ground
    14·2 answers
  • 8) What kind of circulation carries blood to all organs and systems?
    14·2 answers
  • If an electrostatically charged object is placed near other objects what will occur
    9·1 answer
  • A closed container is filled with oxygen. the pressure in the container is 425 kpa . what is the pressure in millimeters of merc
    5·1 answer
  • After you pick up a spare, your bowling ball rolls without slipping back toward the ball rack with a linear speed of vi=2.62 m/s
    8·1 answer
  • Why do teenagers often feel invincible, like nothing bad can happen to them
    14·1 answer
  • - Which force is generally stronger?
    10·1 answer
  • Newton's First Law is also called the Law of Inertia. Which of the objects below has the most inertia, the white truck or yellow
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!