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
Scrat [10]
3 years ago
13

Two children stretch a jump rope between them and send wave pulses back and forth on it. The rope is 4.5 m long, its mass is 0.4

2 kg, and the force exerted on it by the children is 71 N. (a) What is the linear mass density of the rope (in kg/m)?
(b) What is the speed of the waves on the rope (in m/s)?
Physics
1 answer:
lions [1.4K]3 years ago
7 0

Answer:

density = 0.0933 kg/m

speed = 27.581 m/s

Explanation:

given data

length L = 4.5 m

mass m = 0.42 kg

force  F = 71 N

to find out

mass density and speed

solution

we find linear mass density

linear mass density  = mass / length

put here all value

density = 0.42 / 4.5

density = 0.0933 kg/m

and

speed of wave

speed = √(F/density)

speed = √(0.42/0.933)

speed = 27.581 m/s

You might be interested in
HI PLEASE HELP!
butalik [34]

Answer:

Chemical reactions occur slower at lower temperatures and faster at higher temperatures. When you put a glow stick in cold water, the chemical reaction slows down but will last for a longer period of time. When you put a glow stick in hot water, the reaction speeds up but will be over quicker.

Explanation:

(self-explanatory)

I hope this helps, have a nice day.

7 0
3 years ago
Vector A→, having magnitude 2.5m, pointing 37∘ south of east and vector B→ having magnitude 3.5m, pointing 20∘ north of east are
ahrayia [7]

Answer:

Magnitude of the resultant vector is R = 6.81 m

Explanation:

Given :

Vector A having magnitude of 2.5 m

Vector A having direction 37 degree south of east.

Vector B having magnitude of 3.5 m

Vector B having direction 20 degree north of east.

Therefore, the angle between the two vectors is, θ = 37+20 = 57 degree

So, the resultant of the two vectors are given by

$ R = \sqrt{A^2+B^2+2AB \cos \theta}$

$ R = \sqrt{2.5^2+3.5^2+2(2.5)(3.5) \cos 57}$

$ R = \sqrt{6.25+12.25+17.5 \times 0.54}$

$ R = \sqrt{46.45}$

R = 6.81 m

3 0
3 years ago
Earth has seasons because _____.
sladkih [1.3K]

Answer:

c, its axis is tilted

maybe

As it works its way around the sun, its tilted axis exposes different parts of earth.

C would be it because the roation of Earth on its axis doesn't have anything to do with the exposer of the revolution on its axis

7 0
3 years ago
Read 2 more answers
When a star collapses to form a black hole, its mass _____.
romanna [79]
When a star collapses to form a black hole, its mass increases, that is letter C. One example of this is the Big Bang Theory.  
<span>
It is by no doubt that our universe had had its own starting point but how it really started became a debate for the scientists over the past centuries. From theories such as Ekpyrotic theory, White Holes, Matrix theory, and Quantum theory, the Big Bang theory is the theory mostly accepted by scientists. According to the theory, the universe started as a singularity, that is, from a black hole under extreme gravitational pressure and expanded (instead of exploded) and cooled. Its cooling, according to the theory, is still happening now as of the moment.</span>
7 0
4 years ago
A horizontal force of magnitude 356 N is employed to push a 78.0-kg block a distance of 18.6 m on a rough horizontal surface. If
icang [17]

Answer:

6621.6 Joule

0.46525

Explanation:

F = Force = 356 N

s = Displacement = 18.6 m

m = Mass of block = 78 kg

Work done

W=F\times s\\\Rightarrow W=356\times 18.6\\\Rightarrow W=6621.6\ J

The work done by the horizontal force is 6621.6 Joule

F=\mu mg\\\Rightarrow \mu=\frac{F}{mg}\\\Rightarrow \mu=\frac{356}{78\times 9.81}\\\Rightarrow \mu=0.46525

The coefficient of friction between the block and the rough surface is 0.46525

5 0
3 years ago
Other questions:
  • The impact of a truck colliding at 16 km/h with a concrete pillar caused the
    6·1 answer
  • Platinum, which is widely used as a catalyst, has a work function  (the minimum energy needed to eject an electron from the met
    9·1 answer
  • A lamp has a power of 120 w and is left on for 24 hours. A television has a power of 350 W and is left on for 3 hours. Which sta
    5·2 answers
  • How can you turn off a magnetic field produced by an electrical current?
    11·2 answers
  • A 1200 kg car reaches the top of a 100 m high hill at A with a speed vA. What is the value of vA that will allow the car to coas
    12·1 answer
  • what magnetic field is needed to exert a force of 0.4N on a 0.1m long conductor if it carries a current of 2A perpendicular to t
    5·1 answer
  • Laney et al. (false memory):(a) Outline the rating scale used in the Food History Inventory [2 marks]
    10·1 answer
  • ECONOMICS !!!!
    12·1 answer
  • As a planet approaches the aphelion of its orbit to the Sun, what happens?
    13·2 answers
  • Is the force of gravity that attracts my body to the Earth related to the force of gravity between the planets and the Sun
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!