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
solmaris [256]
3 years ago
7

Paul’s 10 kg baby sister Susan sits on a mat. Paul pulls the mat across the floor using a rope that is angled 30° above the floo

r. The tension is a constant 30 N and the coefficient of kinetic friction is 0.20. Use work and energy to find Susan’s speed after being pulled 3.0 m.

Physics
2 answers:
kifflom [539]3 years ago
5 0

Answer: speed= 1.95866m/s ~= 2.0 m/s

Explanation: check attachment for explanation

kiruha [24]3 years ago
4 0

Answer:

The speed of Susan is 2.37 m/s

Explanation:

To visualize better this problem, we need to draw a free body diagram.

the work is defined as:

W=F*d*cos(\theta)

here we have the work done by Paul and the friction force, so:

W_p=F_p*d*cos(0)\\F_p=30N*cos(30^o)=26N\\W_p=26*3*(1)=78J

W_f=F_f*d*cos(180)\\F_f=\µ*(10*9.8-30N*sin(30^o))=16.6N\\W_p=16.6*3*(-1)=50J

Now the change of energy is:

W_p-W_f=\frac{1}{2}m*v^2\\v=\sqrt{\frac{2(78J-50J)}{10kg}}\\v=2.37m/s

You might be interested in
Satellite A orbits a planet at a distance d from the planet’s center with a centripetal acceleration a0. A second identical sate
leva [86]

To solve this problem it is necessary to use the concepts related to the Gravitational Force and Newton's Second Law, as far as we know:

F_g = \frac{GMm}{r^2}

Where,

G = Gravitational constant

M = Mass of earth (in this case)

m = mass of satellite

r = radius

In the other hand we have the second's newton law:

F = ma

Where,

m = mass

a = acceleration

Equation both equations we have,

ma = \frac{GMm}{r^2}

For the problem we have that,

<em>Satellite A:</em>

ma_A = \frac{GMm}{r^2}

<em>Satellite B:</em>

ma_B = \frac{GMm}{(2r)^2}

The ratio between the two satellites would be,

\frac{ma_A}{ma_B}= \frac{\frac{GMm}{r^2}}{\frac{GMm}{(2r)^2}}

Solving for a_B,

a_B = \frac{a_A}{4}

Therefore the centripetal acceleration of  A_B is a quarter of a_A

7 0
3 years ago
Please help 9.2.1 project in science just ned an example​
olga55 [171]

Answer:

Give me what kind of example you need please so I can help you. Put it in the comments.

Explanation:

3 0
3 years ago
How can you determine that a coin
OleMash [197]

Answer:

by checking if its malleble with a hammer

Explanation:

8 0
3 years ago
Please please help you will get the brainlest
astra-53 [7]

Answer:

1. 40/20=2meters per second

2. 0

3.240/20=12 meters per second

6 0
3 years ago
Kiley went 5.7 km/h north and then went 5.8 km/h west. From start to finish, she went 8.1 km/h northwest. Which best describes h
andrew-mc [135]

5.7 km/h north and 5.8 km/h west are instantaneous velocities, while 8.1 km/h northwest is the average velocity.

velocity because there is a direction

3 0
4 years ago
Other questions:
  • If electrons of energy 12.8 ev are incident on a gas of hydrogen atoms in their ground state, photons can be emitted by the exci
    13·1 answer
  • 1 G force = ? Newtons
    7·1 answer
  • Hello! i need answers for this question. it is due today and i need it asap!!! please help! (will give brainlist)
    15·1 answer
  • Preparing an Accounts Payable Schedule Pilsner Inc. purchases raw materials on account for use in production. The direct materia
    7·2 answers
  • What are three ways heat can be transferred?
    13·2 answers
  • Is a computer translucent?
    6·1 answer
  • What two factors are used to calculate kinetic energy?
    9·1 answer
  • What question did use of a telescope by hubble answer A) Is earth the center of the universe B) Is the sun the center of the uni
    15·2 answers
  • Pls answer the question in the picture
    6·2 answers
  • A pool ball moving 1.83 m/s strikes an identical ball at rest. Afterward, the first ball moves 1.15 m/s at a 23.3° angle. What i
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!