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
maria [59]
3 years ago
14

A child pulls a 3.00-kg sled across level ground at constant velocity with a light rope that makes an angle 30.0° above horizont

al. The tension in the rope is 5.00 N. Assuming the acceleration of gravity is 9.81 m/s2, what is the coefficient of friction between the sled and the ground?
Physics
1 answer:
Alexus [3.1K]3 years ago
5 0

Answer:

μ = 0.161

Explanation:

Since the tension on the rope (F) is being applied at an angle (θ), it should be decomposed into a vertical and a horizontal component.

The vertical component of the tension on the rope (F*sin(θ)) is pulling the sled upwards, decreasing the normal force.

Therefore, the normal force can be calculated as:

N = m*g - F*sin(\theta)\\N= 3*9.8 - 5*sin(30)\\N= 26.9 N

The horizontal component of the tension on the rope (F*cos(θ)) is the force being applied to move the sled and that should equal the coefficient of friction multiplied by the normal force.

F*cos(\theta)=N*\mu\\5*cos(30)=26.9*\mu\\\mu=0.161

the coefficient of friction between the sled and the ground is 0.161

You might be interested in
Helium-4 has how many protons
Natalka [10]

Answer: Helium has 2 protons.

4 0
3 years ago
What is the difference between a negative feedback system and a positive feedback system?
Anni [7]

Answer:

D

Explanation:

The negative feedback is responsible for maintaining equilibrium (stability) in a system as it lessens effects, which is contrary to positive feedback which increases reaction and moves a system further away from equilibrium (stability), It does so by amplifying the effects of a product or event and occurs when something needs to happen quickly. e.g

  • Insulin lowers down blood sugar levels, so when the body detects that it has too much sugar, the pancreas is prompted to release insulin and only stops when balance is achieved; hence, negative feedback.  
  •  When there is a tear on the skin, a chemical is released. This chemical causes platelets in the blood to activate, hence they release a chemical which signals more platelets to activate, until the wound is clotted, positive feedback.

7 0
3 years ago
FREE BRAINLEST JUST COMMENT MRBEAST
Pepsi [2]

Answer:

MRBEAST-

Explanation:

6 0
3 years ago
Read 2 more answers
An object falling. What type of energy is being described
SIZIF [17.4K]

Answer: Kinetic energy

3 0
2 years ago
Read 2 more answers
Which graph illustrates constant speed and velocity?
boyakko [2]

The correct graph is <u>D</u>.

The graph <em>A</em> is a straight line sloping downwards and it shows that the speed of the body is decreasing at a constant rate. Therefore, this s a graph of a body that is under a constant deceleration.

The graph B is a straight line which slopes upwards. Hence the graph shows that the speed of the body increases at a constant rate. Therefore, this is a graph of a body that is accelerating at a constant rate.

The graph C is curved line, which curves upwards. The slope of the curve increases with time. This is therefore, a graph of a body which is under increasing acceleration.

The graph D, however is a straight line parallel to the time axis. The speed of the body has the same value at all times. Therefore, Graph D is the graph which shows the motion of a body with constant speed.

8 0
3 years ago
Read 2 more answers
Other questions:
  • Can someone please explain to me what in the hell this asking?
    13·1 answer
  • What does the prefix kilo mean?
    9·2 answers
  • An airplane travels 500 miles in 2.5 hours. What is the speed of the plane in mi/sec
    6·1 answer
  • 3. A model rocket is launched straight upward at 58.8 m/s.
    11·1 answer
  • What are the names of the 2 charged particles in an atom and what are their charges
    10·1 answer
  • What is magnetic declination?
    15·2 answers
  • You have 4.9 g of an unknown substance. To identify the substance, you decide to measure its specific heat and find that it requ
    8·1 answer
  • When researching online, as long as the gathered information is the result of a valid Internet search engine, it is not necessar
    9·1 answer
  • A golfer takes two putts to sink his ball in the hole. The first putt displaces the ball 6.50 m east, and the second putt displa
    11·1 answer
  • Ice is put in a cooler to cool the contents. to speed up the cooling process, the ice can be?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!