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
jeka57 [31]
3 years ago
12

A box is being pushed across the floor at a constant velocity with an

Physics
1 answer:
Oksana_A [137]3 years ago
8 0

Answer:

<em>Magnitude of frictional force = 30 N</em>

Explanation:

According to the second Newton's law, the net force exerted by an external agent on an object of mass m is:

Fn=m.a

The net force is the vector addition of each individual force. If the sum of all the forces acting on an object is zero, then the acceleration is zero. That means the object moves at a constant speed or is at rest.

When an object is pushed across a horizontal rough surface, there are two forces acting in the direction of the motion: The applied force and the frictional force.

If the applied force is greater than the frictional force, then the object moves at a constant positive acceleration. If the frictional force is greater than the applied force, then the object won't move at all (if it was at rest) or will start a deaccelerated motion (braking).

Finally, if both forces are equal, the object will move at a constant speed or remains at rest. Since the box is moving at a constant speed, we can conclude the frictional force equals the applied force:

Magnitude of frictional force = 30 N

You might be interested in
who brought astronomy out of the dark ages by declaring: "finally we shall place the sun himself at the center of the universe.
solong [7]

Nicolaus Copernicus was the one who brought astronomy out of the dark ages.

In one of his books "On the Revolutions of the Heavenly Bodies", he published the renowned line which declares his theory.

Nicolaus Copernicus, A polish astronomer put forward the theory that the is th Sun one that rests in the middle or center of the Universe and the planet Earth revolves around it on its axis every day.which was considered to be called the Heliocentric system.

To know more about the Heliocentric system refer to the link brainly.com/question/3491738?referrer=searchResults.

To know about Sir Nicolaus Copernicus' work refer to the link brainly.com/question/6699117?referrer=searchResults.

#SPJ4

6 0
2 years ago
The concept of aggression cues is associated with A. frustration-aggression theory. B. the work of animal behaviorist Konrad Lor
leva [86]
<span>A. frustration-aggression theory.
Good Luck!!</span>
7 0
2 years ago
a snooker ball travels 4 meters, diagonally across the table it travels at a speed of 5m/s. calculate how long the ball is trave
Korvikt [17]

Answer:

4 secs

Explanation:

I am right trust me

6 0
3 years ago
Find the work done lifting a 290-pound weight 28 feet in the air.
Nataly [62]
The answer is d.8,120 foot-pounds
6 0
3 years ago
Read 2 more answers
The speed of light is 3.0x10^5 km/sec and it takes light 1.3 seconds for light to travel from the moon to earth froim this infor
Vika [28.1K]
The motion of the light is a uniform motion with constant speed v=3 \cdot 10^5 km/s, therefore we can use the basic relationship between speed, space and time:
v= \frac{S}{t} (1)
where S is the distance covered and t is the time taken. The light takes t=1.3 s to travel from the moon to Earth, therefore by rearranging eq.(1) we can find the distance between the Moon and the Earth:
S=vt=(3 \cdot 10^5 km/s)(1.3 s)=390000 km=3.9 \cdot 10^5 km
5 0
3 years ago
Other questions:
  • When the distance between a point source of light and a light meter is reduced from 6.0m to 2.0 m, the intensity of illumination
    14·1 answer
  • ANSWER ASAP!!!!
    13·1 answer
  • Which statement would be the best evidence that heat transfer through radiation has occurred and why? A) A pan gets hot on a sto
    10·2 answers
  • Mechanics: design a decision tree to determine if an object is experiencing an unbalanced force, and using newton's laws of moti
    10·1 answer
  • Need help asap ‼️ 20 pts
    11·1 answer
  • Resuelve:
    13·1 answer
  • A 104 horse-power suv speeds up from 21 m/s to 29 m/s in 3 seconds, what is the mass of the suv?
    9·1 answer
  • What elements had to be made in a supernova explosion?
    7·1 answer
  • The graph represents the reaction 3H2 + N2 2NH3 as it reaches equilibrium. Based on the graph, which two statements about this r
    5·1 answer
  • A copper coin resting on a piece of cardboard is placed on a beaker as shown in the diagram below. When the cardboard is rapidly
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!