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
rewona [7]
3 years ago
10

7. Two people are pushing a 40.0kg table across the floor. Person 1 pushes with a force of 490N

Physics
1 answer:
artcher [175]3 years ago
7 0

Answer:

20.4 m/s^{2}

Explanation:

To start doing this problem, first draw a free body diagram of the table. My teacher always tells us to do this, and I find that it is very helpful. I have attached a free body diagram to this answer- take a look at it.

First, let us see if Net force = MA. To do that, we need to determine whether the object is at equilibrium horizontally. For an object to be at equilibrium, it either needs to be moving at a constant velocity or not moving at all. Also, if an object is at equilibrium, there will not be any acceleration. But we know that there IS acceleration horizontally, so it cannot be in equilibrium. If it is not in equilibrium, we can use the formula ∑F= ma.

Let us determine the net force. Since the object is moving horizontally, we can ignore the weight and normal force, because they are vertical forces. The only horizontal forces we need to worry about are the applied force and force of friction.

Applied force = 1055 N (490 + 565)

Friction force= Unknown

To find the friction force, use the kinetic friction formula, Friction = μkN

μk is the coefficient, which the problem includes- it is 0.613.

N is the normal force, which we have to find.

*To find the normal force, we have to determine if the object is at equilibrium VERTICALLY. Since it has no acceleration vertically (it's not moving up/down), it is at equilibrium. Now, when an object is at equilibrium in one direction, it means that all the forces in that direction are equal. What are our vertical forces? Weight (mg) and Normal force (N). So it means that the Normal force is equal to the Weight.

Weight = mg = (40)(9.8) = 392 N

Normal force = 392 N

Now, plug it back into the formula (μkN): (0.613)(392) = 240.296 N

Friction = 240.296 N

Now that we know the friction, we can find the horizontal net force. Just subtract the friction force, 240.296 from the applied force, 1055 N

Horizontal Net Force: 814.704 N

Now that we know the net force, plug in the numbers for the formula

∑F= ma.

814.704 = (40.0)(a)

*Divide on both sides)

a = 20.3676 m/s^2

Round it to 3 significant figures, to get:

20.4 m/s^{2}

You might be interested in
What changes occurred when Zoroastrianism became a state religion during the Sasanian Empire?
statuscvo [17]
Zoroastrianism affected the way the Persians governed their subjects by allowing the territories under their rule to worship their own religion.
8 0
3 years ago
Please help <br> Convert the following distance v time graph velocity graph
Reil [10]

Explanation:

for v vs t graph for t=9 to 11,v=15kmph

similarly v2=0,v3=60kmph&v4= -40kmph

5 0
3 years ago
(FIRST TO ANSWER CORRECTLY WILL BE THE BRAINIEST!!!)How will the temperatures of the water in the beakers compare if an equal am
bulgar [2K]

Answer:

the answer is the temperatures of both beakers' water will increase by the same amount...

Explanation:

I know this because i just did it on study island

7 0
3 years ago
Read 2 more answers
Plz help on number 4
ki77a [65]
Forces on a Baseball. When a baseballis thrown or hit, the resulting motion of the ball is determined by Newton's laws of motion. ... Lift and drag are actually two components of a single aerodynamic force acting on the ball. Drag acts in a direction opposite to the motion, and lift acts perpendicular to the motion.
8 0
3 years ago
Please help the question is the picture below.
balu736 [363]

Its 30 kg cause I got 30 kg dude.

8 0
2 years ago
Read 2 more answers
Other questions:
  • Fires typically burn in a downward fashion
    12·1 answer
  • Two boys are standing on a bridge 10 m above a stream. One boy throws a rock horizontally with speed of 5.0 m/s at exactly the s
    8·1 answer
  • Forces can be added together only if they are
    11·1 answer
  • The average gorilla can travel 40.23 meters in 4 seconds, calculate the average speed in meters per second (m/s) 
    13·2 answers
  • a ferryboat has an acceleration of 0.50 m/s. If the ferry travels 125m in 20 seconds while accelerating, what was its initial ve
    8·1 answer
  • what are geology,astronomy,and physics is the answer hypothesis,scientific inquiries,scientific discplines,or protocols?
    15·1 answer
  • Which nitrogen base sequence is the partner of T-C-A-G-C-A?
    9·1 answer
  • A change in the direction of a wave when the wave finds an obstacle or an edge, such as an opening bending of waves around a bar
    10·1 answer
  • How much weight is generated by an 80 kg person on planet earth? On the moon?
    5·1 answer
  • Please help no trolls no links
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!