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
Anika [276]
3 years ago
8

15. Calculate The coefficient of kinetic friction be-

Physics
1 answer:
allochka39001 [22]3 years ago
3 0

Answer:

Wt = 26.84 [N]

Explanation:

In order to solve this problem we must use the definition of work in physics. Which tells us that this is equal to the product of force by distance.

In this case, we must sum the works of the force applied by the box and the friction force that also acts on the box.

The friction force is defined as the product of the normal force by the coefficient of friction.

f = N*μ

where:

N = normal force = m*g [N] (units of Newtons)

m = mass = 72 [kg]

g = gravity acceleration = 9.81 [m/s²]

f = friction force [N]

μ = friction coefficient = 0.21

f = 72*9.81*0.21

f = 148.32 [N]

Now the total work:

Wt = WF - Wf

where:

Wt = total work [J] (units of Joules)

WF = work by the pushing force [J]

Wf = work done by the friction force [J]

Wt = (160*2.3) - (148.32*2.3)

Wt = 26.84 [N]

Note: The friction force exerts a negative work, because this force is acting in opposite direction to the movement, therefore the negative sign.

You might be interested in
Figure 13 shows a child’s toy . The toy hangs from a hook in the ceiling.
Grace [21]

The number of oscillations of the toy in a second is 1.25.

<h3>What is frequency?</h3>
  • This is the number of complete oscillation of an object is a given period.

The given parameter:

  • Frequency of the toy, F = 1.25 Hz

The frequency of an object is calculated as follows;

f = \frac{n}{t} \\\\

where;

  • n is the number of oscillations
  • t is the time of motion

The number of oscillations of the toy in a second is calculated as follows;

1.25 = \frac{n}{1} \\\\n = 1.25

Learn more about frequency here: brainly.com/question/10728818

6 0
2 years ago
Does the horizontal motion of the projectile depend on the vertical motion?
bezimeni [28]
No, resolve in both directions separately 
4 0
3 years ago
Read 2 more answers
A current of 2.0 A flows through a circuit containing a motor with a resistance of 12 ohm how much energy is converted if the mo
bearhunter [10]

The energy converted is 48 Joules

<h3>How to determine the energy</h3>

We have the formula for energy in a circuit as

Energy = Power × time

Power = I^2 R

Current, I = 2.0 A

time = 1 minute

Resistance = 12 Ohm

Substitute into the formula

Power = 2 × 2 × 12

Power = 48 Watts

Energy = 48 × 1

Energy = 48 Joules

Thus, the energy converted is 48 Joules

Learn more about energy in a circuit here:

brainly.com/question/14950715

#SPJ1

5 0
1 year ago
Can someone plz help me :'(
morpeh [17]
1 is amplitude crest is 5 3 is wavelength. Your chart is confusing so that’s all I got
5 0
3 years ago
Read 2 more answers
Please help me with the correct answer​
Rudik [331]

Answer: fluid fraction

Explanation:

3 0
3 years ago
Other questions:
  • Which 2 elements are most likely to react and form a compound? why?
    5·1 answer
  • Which of the following statements about rest and physical activity is NOT true?
    14·1 answer
  • In a perfect vacuum, light waves travel at 300,000 kilometers every second. When light waves travel through materials, such as a
    7·2 answers
  • Perform an Internet search to learn about grounding wires, fuses, and circuit breakers. Specifically,
    11·1 answer
  • Find the acceleration of a train whose speed increases from 7m/s to 17 m/s in 120s
    15·1 answer
  • the electromagnet shown in the image has a wire coiled 5 times around a nai. it can lift up to 7 metal paper clips. What two cha
    13·2 answers
  • RADIOWAVES of constant amplitude can be generated with
    11·1 answer
  • Pls help me with this one :)) ​
    11·1 answer
  • A piece of fruit is falling from a tree.
    13·1 answer
  • The Newton is the SI unit for ____.<br> temperature<br> mass<br> weight<br> density
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!