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
Contact [7]
3 years ago
9

g A 47.3 kg girl is standing on a 162 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a fla

t, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.36 m/s relative to the plank. What is her velocity relative to the ice surface
Physics
1 answer:
koban [17]3 years ago
6 0

Answer:

Explanation:

mass of the girl m₁ = 47.3 kg

mass of the plank m₂ = 162 kg

velocity of the girl with respect to surface = v₁

velocity of plank with respect to surface = v₂

v₁+ v₂ = 1.36

v₂ = 1.36 - v₁

applying conservation of momentum law to girl and plank.

m₁v₁ = m₂v₂

47.3 x v₁ = 162 x ( 1.36 - v₁ )

47.3 v₁ = 220.32 - 162v₁

209.3 v₁ = 220.32

v₁ = 1.05 m /s

You might be interested in
What is the gravitational potential energy of a 2.5kg object that is 300m above the surface of the earth? g=10m/s
Alexus [3.1K]

Answer:

7350 J

Explanation:

Gravitational Potential Energy: This is defined as the energy possessed by a body due to it's position in the gravitational field. The S.I unit is Joules(J).

Applying,

E.p = mgh..................... Equation 1

Where E.p = Gravitational potential Energy, m = mass of the object, h = height of the object above the surface of the earth, g = acceleration due to gravity.

Given: m = 2.5 kg, h = 300 m

Constant: g = 9.8 m/s²

Substitute these values into equation 1

E.p = 2.5(300)(9.8)

E.p = 7350 J.

4 0
3 years ago
The force that moving charged particles exert on one another is called
Irina-Kira [14]
It should be electromagnetic force
6 0
3 years ago
What is necessary for a substance to be a conductor of electricity?
Stella [2.4K]
The main requirement for a good conductor of electricity is to have a lot of valence electrons. Valence electrons are the electrons of the outer shells of atoms not bound with other atoms (for example through covalent bounds). These electrons are "free to escape" as soon as an electric field with enough intensity is applied to the material, and therefore these electrons will be free to move in the material producing an electric current.
3 0
4 years ago
How many resistors are found in this circuit? <br> A) 0<br> B) 1<br> C) 2<br> D) 3
Dmitriy789 [7]
Show us the pictures I don't see it
6 0
3 years ago
An object of mass 'm' is on an inclined plane with an
Levart [38]

Answer:

F_{\text{par}} = F_{\text{frict}}

F_{\text{norm}} = F_{\text{perp}}

Explanation:

See attachment for complete work.

Download pdf
7 0
2 years ago
Other questions:
  • What makes astronomers think that impact rates for the Moon must have been higher earlier than 3.8 billion years ago?
    15·1 answer
  • Mmmm hmmmm<br> Crlly yup pop I’m<br> I u jouk is the season go ju
    10·2 answers
  • Match the object to the type of motion it's displaying. which letter goes with which number?
    15·1 answer
  • I need this question answered about the solar system.
    10·1 answer
  • HELP!!!
    5·1 answer
  • What type of detection device tracks nuclear particles in a super heated liquid and the end result is swirls on a colored backgr
    12·2 answers
  • How does a free-body diagram tell you about the net force on an object?
    8·2 answers
  • Mateo and Jackie were on a playground rolling some different-sized balls to get them to crash. They used a tennis ball (the same
    11·1 answer
  • Help! Help!
    14·1 answer
  • A penny is dropped from the 82nd Floor Observatory of the Empire State Building. The penny will fall for 8.1s before hitting the
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!