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
motikmotik
2 years ago
8

Two motorcycles are traveling in opposite directions at the same speed when one of the cyclists blasts her horn, which has frequ

ency of 544 Hz. The other cyclist hears the frequency as 563 Hz. If the speed of sound in air is 344 m/s, what is the speed of the motorcycles
Physics
1 answer:
Galina-37 [17]2 years ago
5 0

Answer:

6ms^-1

Explanation:

Given that the frequency difference is

( 563- 544) = 19

So alsoThe wavelength of each wave is = v/f = 344 /544

and there are 19 of this waves

So it is assumed that each motorcycle has moved 0.5 of this distance

in one second thus the speed of the motorcycles will be

=> 19/2 x 344/544 = 6.0 m/s

You might be interested in
A farmer hitches her tractor to a sled loaded with firewood and pulls it a distance
Delvig [45]

(a) The work done by the force applied by the tractor is 79,968.47 J.

(b) The work done by the frictional force on the tractor is 55,977.93 J.

(c) The total work done by  all the forces is 23,990.54 J.

<h3>Work done by the applied force</h3>

The work done by the force applied by the tractor is calculated as follows;

W = Fd cosθ

W = (5000 x 20) x cos(36.9)

W = 79,968.47 J

<h3>Work done by frictional force</h3>

W = Ffd cosθ

W = (3500 x 20) x cos(36.9)

W = 55,977.93 J

<h3>Net work done by all the forces on the tractor</h3>

W(net) = work done by applied force  -  work done by friction force

W(net) = 79,968.47 J -  55,977.93 J

W(net) = 23,990.54 J

Learn more about work done here: brainly.com/question/25573309

#SPJ1

4 0
1 year ago
An archer pulls her bowstring back 0.376 m by exerting a force that increases uniformly from zero to 251 N. (a) What is the equi
Amanda [17]

Answer:

(A) 667.5 N/m

(B)

Explanation:

(A) Let the spring constant be k.

Using the formula F = kx

k = 251 / 0.376

K = 667.5 N/m

(B)

Work done

W = 0.5 × kx^2

W = 0.5 × 667.5 × 0.376 × 0.376

W = 47.2 J

8 0
3 years ago
A small boat coasts at constant speed under a bridge. A heavy sack of sand is dropped from the bridge onto the boat. The speed o
Tju [1.3M]

Answer:

d. decreases

Explanation:

The law of conservation of momentum tells us that the sum of momenta before the collision is equal to the sum of momenta after the collision. The bag has no momentum as it falls onto the boat because its velocity is zero in the horizontal direction. But after it hits the boat, it's momentum increases while the momentum of the system remains the same. That means a component of the system must decrease somewhere else. And that component is the velocity, not the mass, of the boat.

7 0
3 years ago
A skateboarder rolls down the sidewalk with an initial velocity of 0 m/s. If her acceleration is
VikaD [51]

Answer:

80m/s

Explanation:

to find it you have to work it out by using the formula distance divided by speed to find time.

3 0
2 years ago
Protein synthesis is vital for cell growth and metabolism. Transcription and translation are known as the central dogma of biolo
Liono4ka [1.6K]
I  think the answer is D i'm not for sure tho
 

6 0
3 years ago
Read 2 more answers
Other questions:
  • Choose the appropriate word choices below that correctly complete the blanks in the following three sentences: At the beginning,
    12·1 answer
  • Which planet will take the shortest revolution around the sun?
    14·2 answers
  • •1 if a saturn v rocket with an apollo spacecraft attached had a combined mass of 2.9 × 105 kg and reached a speed of 11.2 km/s,
    12·1 answer
  • The earth pulls the moon towards it because of the earth has more mass and therefore moe
    10·1 answer
  • A motorcyclist is traveling at 58.3 mph on a flat stretch of highway during a sudden rainstorm. The rain has reduced the coeffic
    7·1 answer
  • Which of the following lists contains only examples of renewable sources of energy?
    14·2 answers
  • Two forces act on an object. One force has a magnitude of 10 N directed north, and the other force has a magnitude of 2 N direct
    8·1 answer
  • What mathematical formula is needed to determine the student's displacement from point A to C? (Hint: think
    11·1 answer
  • Sample Response: When there is less rainfall, land, which is part of the geosphere, becomes dry. When there is not enough water,
    10·1 answer
  • A converging lens with a focal length of 4.0 cm is to the left of a second identical lens. When a feather is placed 12 cm to the
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!