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
sertanlavr [38]
3 years ago
12

Do Number 8 Please respond fast WILL MARK BRAINLIEST (THIS INVOLVES INCLINED PLANES)

Physics
1 answer:
jasenka [17]3 years ago
5 0

Answer:

We need to apply a force of magnitude 32.13 N

Explanation:

The forces acting on this crate are:

1) the crate's weight (which we can decompose in two components: one parallel to the incline, and the other one perpendicular to it) The parallel component of the weight is the product of the mass, times g (9.8 m/s^2) times sin(35). This component is pointing down the incline, and let's call it the "x" component. Its magnitude is given by:

w_x=m\,\,g\,\,sin(35^o)

The magnitude of the perpendicular component of the weight (let's call it the y-component) is given by the expression:

w_y=m\,\,g\,\,cos(35^o)

2) The force of friction between the crate and the surface of the incline (acting parallel to the incline and opposite the direction of the parallel component of the weight (w_x)

3) The extra force we need to apply perpendicular to the incline and towards it (lets call it "E") so the crate doesn't slide down.

4) The normal force that the incline applies on the crate as reaction. This force is pointing away from the incline.

For the block not to move (slide down the incline), we need that the parallel component of the weight equals the force of friction with the surface of the incline. Let's call this force of friction f_s, and recall that it is defined as the product of the normal force times the coefficient of friction (given as 0.3 in value). This in equation form becomes:

f_s=m\,g\,sin(35^o)\\\mu\,\,n=m\,g\,sin(35^o)\\n=\frac{m\,g\,sin(35^o)}{\mu} \\n=\frac{3\,*\,9.8\,\,sin(35^o)}{\0.3}\\n=56.21 \,\,N

We solved for the needed magnitude of the normal force in order to keep the crate from sliding.

Now we study the forces vertical to the incline, which should also be balanced since the crate is not moving in this direction. We add all the forces acting towards the incline (the perpendicular component of the crate's weight, and the extra force "E"), and make them equal to the only force coming outwards (the normal force):

n=E+m\,\,g\,\,cos(35^o)

and we can solve for the magnitude of the extra force we need to apply by replacing all other known values:

n=E+m\,\,g\,\,cos(35^o)\\56.21\,N=E+3\,*\,9.8\,\,cos(35^o)\,N\\E= [56.21-3\,*\,9.8\,\,cos(35^o)]\,N\\E=32.13\,N

So this is the magnitude of the force we need to apply in order to keep the crate from sliding down the incline.

You might be interested in
12. The bond formed when two atoms share a pair of electrons is called a
givi [52]

Answer:A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

Explanation:

4 0
3 years ago
Hydrogen is in Group 1A of the periodic table, known as the alkali metals, although it obviously isn't a metal. What is the reas
jeka57 [31]
It's highly reactive and contains only one valence electron
6 0
3 years ago
The atoms in a solid move about freely
ivolga24 [154]

No, not exactly.  They jiggle and tremble and vibrate a lot, but
they always basically stay in very nearly the same place.

It's like if you're allowed to go anywhere you want in your jail cell,
you wouldn't exactly call that "moving about freely".

6 0
3 years ago
there are 5 influencing factors that may affect participation rate in physical activity. can you name them?
Stella [2.4K]
Demographic Barriers, Occupation, Age, Obesity, <span>
Psychological Barriers</span>
6 0
3 years ago
Can someone please help me?
svetlana [45]

Answer:

acceleration...............

7 0
3 years ago
Read 2 more answers
Other questions:
  • Two equal mass carts approach each other with velocities equal in magnitude but opposite in direction. Friction can be neglected
    7·1 answer
  • What happens when a cell stops using energy?
    14·2 answers
  • All atoms contain negatively charged ____________ that orbit around a positively charged nucleus.
    15·1 answer
  • Determine the magnitude of the component of F directed along the axis of AB. Set F = 520 N .
    15·2 answers
  • To build muscle you must do what ?
    11·2 answers
  • Longitudinal waves travel through a series of ___ and ___ PlEASE HELP FAST!!!!!!
    7·1 answer
  • 1. While driving to Palm Desert you notice that some of the windmills near the freeway are spinning 20 times per minute. The len
    6·1 answer
  • When air mass is caught between two cold fronts the result is a _______ front.
    6·1 answer
  • Two physics students are arguing about superconductors and their discovery, Jeffe says that he can use a
    6·1 answer
  • A transformer has 500 volts applied to the primary side and 10,000 volts are measured
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!