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
Hatshy [7]
3 years ago
10

Josh starts his sled at the top of a 2.9-m-high hill that has a constant slope of 25∘. After reaching the bottom, he slides acro

ss a horizontal patch of snow. The hill is frictionless, but the coefficient of kinetic friction between his sled and the snow is 0.06. How far from the base of the hill does he end up?
Physics
1 answer:
algol133 years ago
3 0

Answer:

S=48.29 m

Explanation:

Given that the height of the hill h = 2.9 m

Coefficient of kinetic friction between his sled and the snow μ = 0.08

Let u be the speed of the skier at the bottom of the hill.

By applying conservation of energy at the top and bottom of the inclined plane we get.

Potential Energy=kinetic Energy

mgh = (1/2) mu²

u² = 2gh

u²=2(9.81)(2.9)

   =56.89

u=7.54 m/s

a = - f / m

a = - μ*m*g / m

a = - μg

From equation of motion

v²- u² = 2 -μ g S

v=0 m/s

-(7.54)²=-2(0.06)(9.81)S

S=48.29 m

You might be interested in
11 1 point
coldgirl [10]

Answer:OPEW

Explanation:

I hope this helps

7 0
3 years ago
Why must indirect evidence be used to study the structure of atoms?
Sloan [31]
Indirect evidence must be used to study the structure of atoms, because the direct evidence affects the position and energy of the particles of the atomic structure.

For example, imagine you use a light ray to find the location of an electron in an atomic structure, the current location of the electron you are now seeing is as a result of the light ray, and the electron has changed it's initial position to a new position as a result of the effect of the light ray.

So indirect means would probably give more accurate answers about the atomic structure than that of the direct means.

An example of the indirect means would be for example setting up a mathematical equation or  model of the atomic structure and trying to provide solution for the model or equation.
8 0
3 years ago
Which of the following methods of improving air quality does not require advanced technology?
Kisachek [45]
Conservation is a method of improving air quality
3 0
3 years ago
Can y'all please help me out with this ?
Inessa05 [86]

Answer:

no where is the main part of the question dude

3 0
3 years ago
Which of the following are inertial reference frames? A. A car driving at steady speed on a straight and level road. B. A car dr
Aloiza [94]

Answers:

A. A car driving at steady speed on a straight and level road.

B. A car driving at steady speed up a 10∘ incline.

Explanation:

An object is said to be in an inertial reference frame if the net force acting on the object is zero. According to Newton's second law, this also means that the acceleration of the object is also zero:

F=ma

Since F=0, a=0 as well.

Let's now analyze each case.

A. A car driving at steady speed on a straight and level road. --> YES: this is an inertial reference frame, because the car is keeping a constant speed and a constant direction, so its velocity is not changing, and its acceleration is zero.

B. A car driving at steady speed up a 10∘ incline. --> YES: this is an inertial reference frame, because the car is keeping a constant speed and a constant direction, so its velocity is not changing, and its acceleration is zero.

C. A car speeding up after leaving a stop sign. --> NO: this is not an intertial reference frame, because the car is speeding up, so it is accelerating.

D. A car driving at steady speed around a curve. --> NO: this is not an inertial reference frame, because the car is changing direction, therefore its velocity is changing and so the car is accelerating.

So the only two choices which are correct are A and B.

8 0
3 years ago
Read 2 more answers
Other questions:
  • Can you please help me with #9?
    12·1 answer
  • Give one advantage and one disadvantage of physical models
    15·1 answer
  • Suppose that the habitat of a species that once lived on land has now become covered in water. In order to survive, the species
    15·2 answers
  • Fluids flow and exert forces on objects.
    7·1 answer
  • Chemical compounds are named using an orderly set of rules called _____.
    7·1 answer
  • Please help
    15·2 answers
  • A cannon fires a shell toward a target with a momentum of 6750 kg m/s. This shell moves with a velocity of 150 m/s. Calculate
    14·1 answer
  • A science student observes three lines in an emission spectrum, one red, one yellow, and one blue. Which one was caused by an el
    5·1 answer
  • Water pumps use electrical energy to create mechanical energy needed to move water.
    13·1 answer
  • Example of a balanced force
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!