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
artcher [175]
3 years ago
14

You are sitting on a deck of your house surrounded by oak trees. You hear the sound of an acorn hitting the deck. You wonder if

an acorn will do much damage if instead of the deck it hits your head. Let the mass of the acorn be 3.5 g. Suppose it drops from a height of 14 m (relative to your head). Assume that the acorn sinks in 0.50 cm of your head skin before coming to a stop.
Physics
1 answer:
Black_prince [1.1K]3 years ago
8 0

Answer: 96N

Explanation:

To calculate the velocity of the impact On the persons head, we have

h = gt²/2

14 = 9.81t²/2

t² = 28/9.8

t² = 2.86

t = 1.69s

V = u + at

V = 0 + 9.81*1.69

V = 16.58m/s

a(average) = (v1² + v2²) /2Δy

a(average) = 16.58² + 0)/2 * 0.005

a(average) = 274.8964/0.01

a(average) = 27489.64m/s²

Using newton's second law of motion,

F(average) = m * a(average)

F(average) = 0.0035 * 27489.64

F(average) = 96.21N

Therefore the force needed by the acorn to do much damage starts from 96N

You might be interested in
Which of the angles shown in this picture is the angle of incidence?<br> A<br> B
Dmitry_Shevchenko [17]
The pictures are not attached, therefore, I cannot give a specific choice.
However, I will try to help you out.

The angle of incidence is defined as the angle formed between the ray of light and the normal to the surface that the ray is falling on.

The angle of incidence can be shown in the attached image.

Therefore, for your question, choose the image on which the above description applies.

Hope this helps :)

6 0
3 years ago
Read 2 more answers
Find the change in kinetic energy of a 0.650 kg fish leaping to the right at 15.0 m/s that collides inelastically with a 0.950 k
yaroslaw [1]
The change in the kinetic energy refers to the work done in displacing a body, thus, the change in the kinetic energy of an object refers to the work done on the object.
The correct formula to use is:
W = Initial kinetic energy - Final kinetic energy;
Where, W = change in kinetic energy
Final kinetic energy and initial kinetic energy = 1/2 MV^2
Initial velocity = 15 m/s
Final velocity  = 13.5 m/s
Initial mass = 0.650 kg
Final mass = 0.950 kg
W = 1/2 [0.650* (15 *15)] - 1/2 [0.950 * (13.5 * 13.5)]
W = 146.25 - 173.13 = 26.88
Therefore, the change in kinetic energy is 26.88 J.
 The negative sign has to be ignored, because change in kinetic energy can not be negative.
<span />
4 0
3 years ago
Read 2 more answers
Usually, when the temperture is increased l, what will happen to the ratevof dissolving?
pochemuha
<span>When temperature is increased, the rate of dissolving increases. The kinetic energy of the molecules of the solute and solvent molecules is high thereby increasing their contact. An example is mixing powdered sugar to the water. When you add water to the sugar, the dissolving process is slow. However, when you increase the temperature of the water by boiling it, the sugar dissolves immediately. </span>
3 0
3 years ago
What other kind of simple machine is a special kind of lever?
ehidna [41]

saitama is the strongest

4 0
2 years ago
What is the relationship between kinetic energy and changing states of matter?
oee [108]

Answer:

The kinetic molecular theory of matter states that: Matter is made up of particles that are constantly moving. All particles have energy, but the energy varies depending on the temperature the sample of matter is in. This in turn determines whether the substance exists in the solid, liquid, or gaseous state.

8 0
2 years ago
Read 2 more answers
Other questions:
  • A circuit is built based on this circuit diagram. What is the equivalent resistance of the circuit?
    6·1 answer
  • ______ is/are usually the best conductor/s. a. Metals c. Air b. Water d. Minerals Please select the best answer from the choices
    6·2 answers
  • Why are lanthanum and actinium at the bottom of the periodic table?
    6·1 answer
  • A uniform 40-N board supports two children weighing 500 N and 350 N. If the support is at the center of the board and the 500-N
    5·1 answer
  • Multiply 2 cm by 100 to convert to meters​
    13·1 answer
  • A sailboat took 25 hours to cover 1/4 of a journey. Then, it
    11·1 answer
  • If you sit close to a campfire, the fire warms you. Describe how thermal energy is transferred from the fire to you.
    5·2 answers
  • A coyote is looking for some food for its young. It spots a pocket mouse near a cactus and starts to track and hunt the mouse fo
    9·2 answers
  • Leena is a 16-year-old girl. She complains of tiredness and loss of appetite. She is unable to concentrate on her studies and ap
    15·1 answer
  • A large air-filled 0.221-kg plastic ball is thrown up into the air with an initial speed of 11.9 m/s. At a height of 2.77 m, the
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!