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
True [87]
3 years ago
8

A soccer player icks a rock horizontally off a 40m high cliff into a pool f water if the player hears the sound of the splash s

later, what was the inital speeed given to the rock assume the speed of sound in air to be 343?
Physics
1 answer:
Semenov [28]3 years ago
7 0

Answer:

v = 9.936 m/s

Explanation:

given,

height of cliff = 40 m

speed of sound = 343 m/s

assuming that time to reach the sound to the player = 3 s

now,

time taken to fall of ball

t = \sqrt{\dfrac{2s}{g}}

t = \sqrt{\dfrac{2\times 40}{9.8}}

t = 2.857 s

distance

d = v  x t

d = v x 2.875

time traveled by the sound before reaching the player

t_0 = t - t_{fall}

t_0 = 3 - 2.875

t_0 = 0.143 s

distance traveled by the wave in this time'

r = 0.143 x 343

r= 49.05 m

now,

we know.

d² + h² = r²

d² + 40² = 49.05²

d =28.387 m

v x 2.875=28.387 m

v = 9.936 m/s

You might be interested in
A baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby has a mass of 4kg. The carriage ha
Ira Lisetskai [31]

Answer:

E=252J

Explanation:

The total mechanical energy of an object or system is given by:

E mech=K+U

Where K is the kinetic energy of the object and U is the potential energy of the object. The carriage, sitting motionless at the top of the hill, has only potential energy in the form of gravitational potential energy.

Gravitational potential energy is given by:

Ug=mgh

Where m is the mass of the object, g is the gravitational acceleration constant, and h is the height of the object above some specific reference point, in this case the ground 21 m below.

The weight of a stationary object at the surface of the earth is equal to the force of gravity acting on the object.

W=→Fg=mg

We are given that the carriage weighs 12 N, therefore mg=12N.

Ug=12N⋅21m

⇒Ug=252Nm=252J

Hope it helped, God bless you!

5 0
3 years ago
Spider-Man and Ned were testing the distance he could shoot his web depending on the angle at which he points his web shooter. H
Serga [27]

Answer:

3. Madison, WI

4. Quito, Equador

6. Main Sequence stars are becoming red giants

Explanation:

3 0
3 years ago
Read 2 more answers
Please help have due very soon?thank you
Andru [333]
The answer is :78 I think
8 0
2 years ago
A cat is running at 24 m/s. It then accelerates at 7 m/s2. How long will it take the cat to reach a speed of 49 m/s?
kozerog [31]

Answer:

t should be 3.57 second

Explanation:

Formula used is v = u+at

In which v is final velocity, u is initial velocity, a is acceleration and t is time.

Substitute each of the info given into the formula and calculate.

49 = 24 + (7)t

t = 3.57s

8 0
3 years ago
The string of a bow and arrow is pulled tight.
SOVA2 [1]

Answer:

elastic

Explanation:

8 0
3 years ago
Other questions:
  • In _______ atomic model, negative electrons orbit the positively charged nucleus.
    9·2 answers
  • An architect finds some unlabeled dimensions on a blueprint, and no scale is shown. a 15-ft. wall that has already been built me
    8·2 answers
  • Koi is climbing through a crevice and places her feet so that her body is perpendicular as shown below she then rest in this spo
    11·1 answer
  • In the given arrangement, the normal force applied by block on the ground is​
    5·1 answer
  • If you and your friend EACH apply 55N of force pushing against a wall for 10 minutes. How much work
    7·1 answer
  • Dipole moment are used to calculate the​
    13·2 answers
  • Problema de coeficiente de rozamiento
    14·1 answer
  • a car accelerates at a constant rate from 15 m/s to 25 m/s while it travels a distance of 125 m. How long does it take to achiev
    11·1 answer
  • Based on the passage, how do the boys resolve their conflict?
    13·2 answers
  • What is the mass of an object if it took 270 J of work to move it 15 meters? Please help!
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!