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
wel
3 years ago
6

You (85 kg) are standing on the horizontal surface at the top of a cliff. The coefficient of static friction between your feet a

nd the ground is .5 and the kinetic coefficient is .4. You have a friend (100kg) that wants to accelerate down the side of the cliff. They set up massless and frictionless pulley and secure themselves with a massless string (physics students can do these sorts of things) that is then tied around your waist. The coefficient of static friction between your feet and the ground is .5 and the kinetic coefficient of friction is .4.
Physics
1 answer:
MArishka [77]3 years ago
7 0

Answer:

 a = 7.6 m / s²

Explanation:

In this exercise we must use Newton's second law .  In general, it is asked to know if the system is in equilibrium or accelerated, suppose that the system is in equilibrium

Person on top of the cliff m = 85 kg

Y axis

          N - W = 0

          N = w₁

          N = m g

X axis

          T’ -fr = 0

          T’ = fr

the friction force has the formula

         fr = μ N

we subtitle

         T’ = μ m g

we calculate

        T ’= 0.5 85 9.8

        T’ = 416.5 N

This is the maximum value that the tension of the rope can have by remaining in static equilibrium.

Person on the cliff   M = 100 kg

        T -W = 0

        T = W = M g

        T = 100 9.8

        T = 980 N

we see that

         T> T ’

       

as the tension exceeds the maximum static friction force, in the system it is accelerated, so the friction coefficient decreases to   μ= 0.4

We medo the problem, but  with acceleration

Person on the cliff

          T ’-fr = m a

          a = (T '-  μ mg) / m

in this case, how the rope should maintain the tension of the diagram of the person hanging

         T ’= T = Mg

we substitute

         a = Mg / m - very g

         a = g (M / m - my)

let's calculate

        a = 9.8 (100/85 - 0.4)

        a = 7.6 m / s²

You might be interested in
Problem:
pav-90 [236]

Answer:

Total energy is constant

Explanation:

The laws of thermodynamics state that thermal energy (heat) is always transferred from a hot body (higher temperature) to a cold body (lower temperature).

This is because in a hot body, the molecules on average have more kinetic energy (they move faster), so by colliding with the molecules of the cold body, they transfer part of their energy to them. So, the temperature of the hot body decreases, while the temperature of the cold body increases.

This process ends when the two bodies reach the same temperature: we talk about thermal equilibrium.

In this problem therefore, this means that the thermal energy is transferred from the hot water to the cold water.

However, the law of conservation of energy states that the total energy of an isolated system is constant: therefore here, if we consider the hot water + cold water as an isolated system (no exchange of energy with the surroundings), this means that their total energy remains constant.

4 0
2 years ago
An atom is made up of which of the following?
mamaluj [8]

Answer:

B electrons protons and neutrons

hope i helped...

Explanation:

6 0
3 years ago
Read 2 more answers
3. The honeycomb-like appearance of this sandstone is a result of.
sladkih [1.3K]

Answer:

The answer is "Option C".

Explanation:

Wedging Freeze is generated by repeated freezing. Freeze wedging occurs, whenever the water is turned into ice as a result of the 9 percent expansion. When it freezes, cracks full of water are forced to separate further. and other options are incorrect, that can be described as follows:

  • In option A, It is a state where the element converts into a liquid, that's why it is not correct.
  • In option B, It is a reaction in which the bonds of water is divided into particular substance, that's why it is not correct.
  • In option D, It is a form of mechanical or physical rock weathering, that's it is not correct.

6 0
3 years ago
Read 2 more answers
2.
krek1111 [17]

Answer:

c

Explanation:

a vector quantity has both magnitude and direction

6 0
2 years ago
On Ella's fifth birthday, her parents told her she had to stop whining or no one would want to play with her. She tried very har
Kisachek [45]
I think the answer to this problem I believe would probably be B. learned optimism. I think it's the closest answer...I THINK
3 0
3 years ago
Read 2 more answers
Other questions:
  • Suppose the initial kinetic energy and final potential energy in an experiment are both zero. What can you conclude?
    5·2 answers
  • We wrap a light, nonstretching cable around a 8.00 kg solid cylinder with diameter of 30.0 cm. The cylinder rotates with negligi
    6·1 answer
  • HURRY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    5·1 answer
  • Which statement accurately classifies helium?
    10·1 answer
  • Two small frogs simultaneously leap straight up from a lily pad. Frog A leaps with an initial velocity of 0.551 m/s, while frog
    6·1 answer
  • 1. Indicate whether these objects or atoms are positively,<br> negatively or neutrally charged.
    15·1 answer
  • In an "atom smasher," two particles collide head on at relativistic speeds. If the velocity of the first particle is 0.741c to t
    10·1 answer
  • How much farther will a car traveling at 100 km/s skid than the same car traveling at 50 km/s?
    9·1 answer
  • A 20 kg box rests on the ground. Round all answers to the hundredths, if necessary. What is the weight of the box?​
    7·2 answers
  • 50 points for 5 questions p.s if u get brainliest u get 50 moe and then u have 100 SO YAAAAAAY p.s dont answer the new one i for
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!