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
Snezhnost [94]
3 years ago
12

We will now use energy considerations to find the speed of a falling object at impact. Artiom is on the roof replacing some shin

gles when his 0.55 kg hammer slips out of his hands. The hammer falls 3.67 m to the ground. Neglecting air resistance, the total mechanical energy of the system will remain the same. The sum of the kinetic energy and the gravitational potential energy possessed by the hammer 3.67 m above the ground is equal to the sum of the kinetic energy and the gravitational potential energy of the hammer as it falls. Upon impact, all of the energy is in a kinetic form.
Mathematics
1 answer:
ohaa [14]3 years ago
3 0

Answer:

v = 8.49 m/s rounded off to 3 significant figures

Step-by-step explanation

Using Energy Conservation

U = Tk + Vp (Sum of kinetic Tk Energy and gravitational potential Vp Energy)

  1. At height = 3.67 m, the hammer was still or the velocity was negligible; hence, vi = 0 m/s.
  2. Ui = 0 + mgh
  3. At ground all potential energy is converted to kinetic; hence, Uf = \frac{1}{2}mv².
  4. Since total energy of the system remains constant we equate Ui to Uf.
  5. Ui = Uf
  6. mgh = \frac{1}{2}mv²
  7. After cancelling out masses and making v the subject of the formula we get:

v = \sqrt[2]{2gh} = \sqrt[2]{2*9.81*3.67} = 8.49 m/s rounded off to 3 significant figures

You might be interested in
A professor believes the students in a statistics class this term are more creative than most other students attending the unive
djverab [1.8K]

Answer:

Correct option: B

Step-by-step explanation:

The professor can perform a One-mean <em>t</em>-test to determine whether the average score of the students in his class is more than the average score of all the students attending university.

A <em>t</em>-test will be used instead of the <em>z</em>-test because the population standard deviation is not provided instead it is estimated by the sample standard deviation.

The hypothesis for this test can be defined as follows:

<em>H₀</em>: The average score of the students in his class is not more then the entire university, i.e. <em>μ ≤ 35</em>.

<em>Hₐ</em>: The average score of the students in his class is more then the entire university, i.e. <em>μ > 35</em>.

Given:

\bar x=40\\SE_{\bar x}=1.63

The test statistic is:

t=\frac{\bar x-\mu}{SE_{\bar x}}=\frac{40-35}{1.63}=3.0674\approx3.07

Thus, the correct option is (B).

4 0
3 years ago
Find the slope of the line that passes through (5,9) and (3,9)
pshichka [43]

Answer:

Since the Y coordinate is constantly 9, it is a horizontal line.

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Beth has 250 comic books in her collection. She begins to sell 20 of them each week. Martin has 80 comic books in his collection
Shtirlitz [24]
Each weeks for how long?
8 0
3 years ago
Read 2 more answers
Find an equation of the tangent line to the curve y = 8 x sin x at the point (π/2, 4π).
densk [106]
<span>y = 5pi/4 - 2x ... I hope it helps</span>
4 0
3 years ago
(9.32 x 10 3) (3.32 x 10 2)
fomenos
9.32x10.3= 12116
3.32x10.2=3984
16100
8 0
3 years ago
Other questions:
  • Factor completely, then place the answer in the proper location on the grid.<br><br> 9x 4 -225y 8
    14·1 answer
  • Line p passes through A(-2, -4) and has a slope of - 1/2
    8·1 answer
  • Sanya has a piece of land which is in the shape of a rhombus. She wants her one daughter and one son to work on the land and pro
    14·1 answer
  • Mr. Vazquez determines that the area of a bathroom in his house is 25 square feet less than 1/5 of the area of the living room.
    7·2 answers
  • How many one-degree angles are in a 70° angle?​
    6·2 answers
  • What is 2−1.8 equal?
    13·2 answers
  • Three students need to produce a prime factorization of 48. Donna states that the first factors in the tree should be 6 and 8. L
    13·2 answers
  • 20 points I beg you help
    14·2 answers
  • What is the graetest commom factor for 6 and 36
    7·2 answers
  • Solve for x.<br> Please help
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!