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
Firdavs [7]
3 years ago
10

You drop a ball from a height of 2.0 m, and it bounces back to a height of 1.6 m. (a) what fraction of its initial energy is los

t during the bounce? (b) what is the ball's speed just before and just after the bounce? (c) where did the energy go?
Chemistry
2 answers:
solmaris [256]3 years ago
8 0

Answer:

c to the ball

Explanation:

sweet [91]3 years ago
5 0

Answer : Part a) Fraction of energy lost : 20 %

Part b) Speed before and after bounce = 6.3 m/s and 5.6 m/s

Part c) Energy is lost as thermal energy .

Part A) Fraction of energy lost during bouncing :

The energy possessed by any object when present at any height is potential energy . The formula of potential energy is given as :

PE = mgh

where PE = potential energy

,m = mass pf object , g = gravitational acceleration and h = height

Given : Initial height , h₁ = 2 m final height , h₂ = 1.6 m

Initial potential energy : m * g* h ₁

Final potential energy = m* g* h₂

Energy lost = Initial PE - Final PE

= ( mgh₁ - mgh2 )

Fraction of energy lost : \frac{energy lost}{initial energy}=\frac{mgh1 - mgh2}{mgh1}

Plugging value in above formula and taking " mg " common =>

Fraction of energy lost = \frac{mg(h1-h2)}{mg (h1)} * 100

= \frac{(h1-h2)}{h1}  * 100

= \frac{(2 - 1.6) }{2}  * 100

Fraction of energy lost = 20%

---------------------------------------------------------------------------------------------------

Part B ) Speed of ball just before and after the bounce.

Speed of ball before the bounce :

The potential energy gets converted to kinetic energy when it fall from height of 2m , so

Potential energy = kinetic energy

mgh₁ = \frac{1}{2} m v²

or v ² = 2gh₁

Given : g = 9.8 m/s² h= 2 m

v² = 2 * 9.8 m/s² * 2 m = 39.2 m²/s²

v = 6.3 m/s

Speed of ball after bounce :

Potential energy = kinetic energy

mgh₂ = \frac{1}{2} m v²

or v² = 2gh₂

= 2 * 9.8 m/s² * 1.6 m = 31.36 m²/s²

v = 5.6 m/s

---------------------------------------------------------------------------------------------

Part C) The energy lost due to friction. When the ball touches the ground , there occur friction force between the surface of ground and ball , due to which energy is lost as thermal energy .

You might be interested in
What do the superscripts and subscripts in the notation ^40 K represent?
raketka [301]

Explanation:

subscript is K

superscript is ^

subscript K means a unit of temperature like F or C

superscript ^ means to the power of

So all together it means to the power of 40 K

3 0
3 years ago
Which of the following is the quantum number set for an electron in the 3rd energy level, dumb-bell shaped orbital, on the z-axi
Juli2301 [7.4K]

Answer:

Explanation:

Principal quantum no "n" = 3

Azimuthal quantum no "l"= 1

Magnetic quantum no "m"= +1/2

Over all is 3pz

5 0
3 years ago
It was observed that magnesium sulphate was present in tap water ,which hardness might that be​
astraxan [27]

Answer:

Calcium sulphate is the right answer for this question.

It is because calcium sulphate helps to obtain the hardness in water. hardness.

The presence of this resource is a main reason for permanent hardness.

Hard drinking water has moderate health benefits, but can pose serious problems for the industrial settings.

Explanation:

8 0
2 years ago
Which scientist was the first to use the telescope in astronomy? Copernicus Newton Kepler Galileo
coldgirl [10]

The scientist that was the first to use the telescope in astronomy was Newton

8 0
3 years ago
Why do we have to add acid to water but not water to acid
KATRIN_1 [288]
It should be CAT!!!!
5 0
3 years ago
Other questions:
  • What is the total number of protons in an h2o atom?
    6·1 answer
  • The Earth only has a limited supply of fresh water; eventually, we will have to use ocean water. We will purify ocean water thro
    7·1 answer
  • Hannah does an experiment. She has two colorless chemicals that she mixes together in a beaker. Which of the following indicates
    7·2 answers
  • When 2.499 g of AX (s) dissolves in 135.3 g of water in a coffee-cup calorimeter the temperature rises from 23.6 °C to 35.2 °C.
    14·1 answer
  • Is a human egg cell eukaryotic yes or no
    9·1 answer
  • 40.0 ml of an acetic acid of unknown concentration is titrated with 0.100 M NaOH. After 20.0 mL of the base solution has been ad
    5·1 answer
  • Which would have a higher boiling point, 1 mole of MgF, or 1 mole of Naci, if they are both dissolved in equal
    6·1 answer
  • What is the speed of an electromagnetic wave that has a wavelength of 8.6 x 10-5 m?
    8·1 answer
  • HELP PLEASE !!!<br> Name the Salt formed When Nitric acid + Magnesium hydroxide
    7·1 answer
  • Pls help! 2CO + O2 → 2CO2
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!