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
erastovalidia [21]
3 years ago
8

The force pressing two stacked objects together is equal to the weight of the object on top. The friction between a piece of woo

d on a stone surface is 22.5 newtons. The same piece of wood is placed on another surface, and the friction between the wood and the surface is now 46.5 newtons.
What could be the second surface?

A) metal
B) concrete
C) brick
D) skin
Physics
1 answer:
34kurt3 years ago
3 0

Answer: B. Concrete

Explanation:

Let N = reacting force pressing the bodies in context together (units in Newtons),

The question stated that the force pressing the two mounted/stacked objects together is equal to the weight of the object on top.

We need to start by finding the weight of the piece of wood.

friction is given by

f = μN

The value of f is 22.5,

and from the chart reference the coefficient of friction between wood and stone, μ is 0.30.

22.5 = 75. 0.30

Putting the values into the equation: 22.5 = 0.30N.

Divide both sides by 0.30 to find the value of N:

N= 22.5/0.3 = 75

Now that the piece of wood will be placed on another surface, its weight of 75 Newton is the force pressing the two bodies together.

To determine the new surface, you should find the new coefficient of friction by using the new value of the force of friction given 46.5:

46.5 = µ(75).

Divide both sides by 75 to isolate μ.

The refer chart also indicates that the coefficient of friction equals 0.62 between wood and concrete, so the new surface corresponding to 0.62 is the concrete, which is (B).

You might be interested in
Which term, when divided by volume, equals density?
vredina [299]

Answer:

C) Mass

Explanation:

The mass of an object divided by its volume equals the density.

Hope this helps!

8 0
3 years ago
Read 2 more answers
What must be the distance in meters between point charge q1 = 23.5 µc and point charge q2 = -64.2 µc for the electrostatic force
svlad2 [7]
The answer for your problem is shown on the picture.

7 0
3 years ago
A scientist is trying to predict the regions of the world most likely to see a decrease in natural resources from population cha
aleksley [76]

<u><em>Developed countries will see a decrease in natural resources, because their population will decrease.</em></u>

8 0
3 years ago
Read 2 more answers
if heat energy is transferred from direct contact between a warm and a cold object it has been transferred by what ?
Katarina [22]

When heat energy is transferred from direct contact between a warm and a cold object , it is known as heat transfer by conduction.

In conduction, the heat transfer takes place within an object or between two objects in contact until the temperature becomes uniform. this kind of heat transfer continues until the temperature at two ends between which the heat transfer take place , becomes equal.  Heat transfer takes place from point at high temperature to point at lower temperature.

5 0
3 years ago
Birds cause a lot of damage to airplanes every year. To study this problem, the U.S Air force invented a chicken cannon. Air For
Gnesinka [82]

Answer:

i have this qustion and i am in middle school you in

 

Explanation:

6 0
3 years ago
Read 2 more answers
Other questions:
  • How is static electricity different from electric current
    14·1 answer
  • A truck filled with supplies sets out across the country at 9 A.M. It is traveling at a constant speed of 80.0 km/h. Two hours l
    6·1 answer
  • You drop a rock off a bridge. When the rock has fallen 4 m, you drop a second rock. As the two rocks continue to fall, what happ
    10·1 answer
  • The acceleration of a particle traveling along a straight line isa=14s1/2m/s2, wheresis in meters. Ifv= 0,s= 1 m whent= 0, deter
    7·1 answer
  • An electron is accelerated by a constant electric field of magnitude 410 N/C. Find the acceleration of the electron. The electro
    8·1 answer
  • A rectangular plate has a length of (22.4 ± 0.2) cm and a width of (8.4 ± 0.1) cm. Calculate the area of the plate, including it
    10·1 answer
  • A d'Arsonal meter with an internal resistance of 1 kohm requires 10 mA to produce full-scale deflection. Calculate thew value of
    12·1 answer
  • The human nervous system can propagate nerve impulses at about 102 m&gt;s. Estimate the time it takes for a nerve impulse to tra
    10·1 answer
  • Will mark brainlist<br> THANKS!
    13·1 answer
  • Which unit of measurement is best to estimate the volume of a juice box
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!