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
Alika [10]
3 years ago
15

while sitting on a tree branch 10 m above the ground, you drop a chestnut. When the chestnut has fallen 2.5 m, you throw a secon

d chestnut straight down. What initial speed must you give the second chestnut if they are both to reach the ground at the same time?
Physics
1 answer:
Vikki [24]3 years ago
7 0

Answer:

10.5 m/s

Explanation:

For the first chestnut:

y₀ = 10 m

v₀ = 0 m/s

a = -9.8 m/s²

y = y₀ + v₀ t + ½ at²

y = 10 + (0) t + ½ (-9.8) t²

y = 10 − 4.9t²

When y = 7.5:

7.5 = 10 − 4.9t²

t = 5/7

When y = 0:

0 = 10 − 4.9t²

t = 10/7

For the second chestnut:

y₀ = 10 m

y = 0 m

a = -9.8 m/s²

t = 10/7 s − 5/7 s = 5/7 s

y = y₀ + v₀ t + ½ at²

0 = 10 + v₀ (5/7) + ½ (-9.8) (5/7)²

0 = 10 + 5/7 v₀ − 2.5

v₀ = -10.5

The second chestnut must be thrown downwards at 10.5 m/s.

You might be interested in
What is the role of friction when ; a boats engine stops
Aneli [31]

The water exerts a net drag force on the boat, and tends to make the boat move along with the average water flow, or stay put if the water isn't going anywhere. The water will heat up slightly as energy from the big motion ...

6 0
3 years ago
How does the elbow medical and lateral epicondylitis?
dlinn [17]
<span>Lateral epicondylitis, or “tennis elbow,” is an inflammation of the tendons that join the forearm muscles on the outside of the elbow. </span>The bony bump on the outside (lateral<span> side) of the </span>elbow<span> is called the </span>lateral epicondyle<span>. The ECRB muscle and tendon is usually involved in </span>tennis elbow<span>. </span><span>
Medial epicondylitis, or “golfer’s elbow,” is an inflammation of the tendons that attach your forearm muscles to the inside of the bone at your elbow. </span>It's identified by pain from the elbow to the wrist on the inside (medial<span> side) of the elbow. The pain is caused by damage to the tendons that bend the wrist toward the palm.</span>
4 0
4 years ago
How does gravitational pull affect planets with the same mass but different distance from the sun?
Yakvenalex [24]

Answer:

it just pulls them at the same time

Explanation:

5 0
4 years ago
A flute player hears four beats per second when she compares her note to a 523 HzHz tuning fork (the note C). She can match the
laiz [17]

Answer:

527 Hz

Solution:

As per the question:

Beat frequency of the player, \Delta f = 4\ beats/s

Frequency of the tuning fork, f = 523 Hz

Now,

The initial frequency can be calculated as:

\Delta f = f - f_{i}

f_{i} = f \pm \Delta f

when

f_{i} = f + \Delta f = 523 + 4 = 527 Hz

when

f_{i} = f - \Delta f = 523 - 4 = 519 Hz

But we know that as the length of the flute increases the frequency decreases

Hence, the initial frequency must be 527 Hz

7 0
4 years ago
Read 2 more answers
A crane lifts an air conditioner to the top of a building. If the building is 12 m high, and the air conditioner has a mass of 2
andrey2020 [161]

Work needed = 23,520 J

<h3>Further explanation</h3>

Given

height = 12 m

mass = 200 kg

Required

work needed by the crane

Solution

Work is the transfer of energy caused by the force acting on a moving object  

Work is the product of force with the displacement of objects.  

Can be formulated  

W = F x d  

W = Work, J, Nm  

F = Force, N  

d = distance, m  

F = m x g

Input the value :

W = mgd

W = 200 kg x 9.8 m/s²x12 m

W = 23520 J

5 0
3 years ago
Other questions:
  • An object moves with velocity v(t)=t^2-8t+7
    9·1 answer
  • Why does the frequency of a wave increase as the wavelength decreases? A) because the wave speed remains constant B) because the
    14·2 answers
  • Sam is walking through the park. He hears a police car coming down the street toward him. What happens to the sound of the siren
    13·2 answers
  • Which measurement is a good indicator of physiological age​
    8·2 answers
  • A fuel-filled rocket is at rest. It burns its fuel and expels hot gas. The gas has a momentum of 1,500 kg x m/s backward. What i
    12·1 answer
  • Momentum is mass times velocity, so another way to think of momentum is ____ in motion.
    12·1 answer
  • Help me please pleasee
    9·1 answer
  • A student carries a backpack for one mile. Another student carries the same backpack for two miles
    12·1 answer
  • Pls someone help me!!!!!
    9·2 answers
  • 6.) What force would evetually cause the ball to come to a stop after leaving the ramp​
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!