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
solniwko [45]
4 years ago
14

Samantha is refinishing her rusty wheelbarrow. She moves her sandpaper back and forth 45 times over a rusty area, each time movi

ng with a total distance of 0.12 m. Samantha pushes the sandpaper against the surface with a normal force of 2.6 N. The coefficient of friction for the metal/sandpaper interface is 0.92. How much work is done by the normal force during the sanding process
Physics
1 answer:
Leviafan [203]4 years ago
5 0

Answer:

W = 12.96 J

Explanation:

The force acting in the direction of motion of the sand paper is the frictional force. So, we first calculate the frictional force:

F = μR

where,

F = Friction Force = ?

μ = 0.92

R = Normal Force = 2.6 N

Therefore,

F = (0.92)(2.6 N)

F = 2.4 N

Now, the displacement is given as:

d = (0.12 m)(45)

d = 5.4 m

So, the work done will be:

W = F d

W = (2.4 N)(5.4 m)

<u>W = 12.96 J</u>

You might be interested in
A street light is at the top of a 19 foot tall pole. A woman 5.25 feet tall walks towards the pole with a speed of 7ft/sec along
bezimeni [28]
Answer:

The tip of her shadow is moving at the speed of 9.66 ft/sec

Explanation:

The height of the street light = 19 feet

The height of the woman = 5.25 feet

Distance between the woman and the base of the pole, x = 35 ft

The speed of the woman towards the pole, dx/dt = 7ft/sec

The distance from the base of the streetlight to the tip of the woman's shadow = y

The distance from the woman to the tip of her shadow = y - x

The diagram illustrating this description is shown below

Using similar triangle:

\begin{gathered} \frac{19}{5.25}=\text{ }\frac{y}{y-x} \\ 19(y-x)\text{ = 5.25y} \\ 19y-19x\text{ = 5.25y} \\ 19y-5.25y\text{ = 19x} \\ 13.75y\text{ = 19x} \\ y\text{ = }\frac{19}{13.75}x \\ y\text{ = }1.38x \end{gathered}

Find the derivative of both sides with respect to time, t

\begin{gathered} \frac{dy}{dt}=\text{ 1.38}\frac{dx}{dt} \\ \frac{dy}{dt}=\text{ 1.38(7)} \\ \frac{dy}{dt}\text{ = }9.66\text{ ft/sec} \end{gathered}

The tip of her shadow is moving at the speed of 9.66 ft/sec

7 0
1 year ago
Answer the following questions
zaharov [31]

Answer:

9 - 10N to the left

10 - There is no change on the object

Explanation:

Can I have brainliest answer pls?

7 0
3 years ago
Read 2 more answers
Why does the pattern of colors repeat in a thin soap film? Please use 2 content related sentences. (ref: p.522-530)
Slav-nsk [51]
Becuz when you wash up in the tub you want layers of soap so you don’t stink
4 0
3 years ago
Determine the equivalent capacitance between a and b for the group of capacitors in the drawing.
iragen [17]

Answer:

There are different of arrangements for the capacitors to work inside a given system, as there are two different form of arrangements for the capacitors to be in, which are:

  1. The parallel connections of capacitor,
  2. The series connections of capacitor.

Explanation:

The parallel connection of capacitor is comprised of capacitors having the unequal amount of current, ΔI. And has a same potential difference across the number of capacitors. And the equivalent amount of capacitance,ΔC is calculated by the following equation:

  • ΔC(eq)=C₁ + C₂ + C₃ + C₄ + C(n),

For the series form of arrangements of the capacitors we have the different form of equation which can be explained by the total number of capacitors that are connected in series in combination as they are provided by the equal amount of current,ΔI across it, while the voltage or total amount of potential difference, Δv provided to the system is more different for each of the capacitor. And the equivalent amount of capacitance, ΔC(equivalent) can be determined by the following equation:

  • 1/C(eq)=1/C₁+1/C₂+1/C₃+1/C(n).

3 0
3 years ago
Read 2 more answers
A student is using a metal wire to toast marshmallows in a campfire. Which statement best explains why the wire feels hot after
Licemer1 [7]

Answer:

Heat is transferred from the fire through the wire by conduction.

Explanation:

8 0
3 years ago
Other questions:
  • An ideal parallel-plate capacitor having circular plates of diameter D that are a distance d apart stores energy U when it is co
    8·1 answer
  • Which of the following is a physical change? burning a piece of wood rust forming on an iron fence sawing a piece of wood in hal
    6·1 answer
  • Which law best describes why the planets are pulled toward the Sun and orbit it? Newton's law of universal gravitation Kepler's
    11·2 answers
  • During their physics field trip to the amusement park, Tyler and Maria took a rider on the Whirligig. The Whirligig ride consist
    8·2 answers
  • I have no idea how to solve this.
    12·1 answer
  • ? What is the difference between the Primitive cell and convectional cell
    5·1 answer
  • After being struck by a bowling ball, a 1.8 kg bowling pin sliding to the right at 5.0 m/s collides head-on with another 1.8 kg
    6·1 answer
  • The arrow strikes a deer in the woods with the speed of 55 m/sec at an angle of 315 degrees. Calculate the Horizontal and vertic
    5·1 answer
  • Atoms of which two elements have a combined total of 23 protons? (no links and brainliest)
    7·2 answers
  • Please follow my sis on i.n.s.t.a.g.r.a.m Id - tehzz_13
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!