In a ballistic pendulum experiment, projectile 1 results in a maximum height h of the pendulum equal to 2.6 cm. A second projectile (of the same mass) causes the the pendulum to swing twice as high, h2 = 5.2 cm.The second projectile was how many times faster than the first?
Answers
Answer:
Second projectile is 1.4 times faster than first projectile.
Explanation:
By linear momentum conservation
Pi = Pf
m x U + M x 0 = (m + M) x V
Now Since this projectile + pendulum system rises to height 'h', So using energy conservation:
KEi + PEi = KEf + PEf
PEi = 0, at reference point
KEf = 0, Speed of system zero at height 'h'
PEf = (m + M) g h
So,
So from above value of V
Initial velocity of projectile =U
Now Since mass of projectile and pendulum are constant, So Initial velocity of projectile is proportional to the square root of height swung by pendulum.
Which means
U₂ = 1.41 U₁
Therefore we can say that ,Second projectile is 1.4 times faster than first projectile.
Final answer:
In a ballistic pendulum experiment, if the pendulum swings twice as high with the second projectile as with the first, the speed of the second projectile must have been twice the speed of the first projectile.
Explanation:
In a ballistic pendulum experiment, the relation between speed of the particle and maximum height achieved by the pendulum relies on the law of conservation of energy. The kinetic energy of projectile (which is proportional to the square of the speed) gets converted into potential energy of the pendulum and hence the square of the speed of the particle is directly proportional to the maximum height achieved by the pendulum.
Given that the second projectile causes the pendulum to swing twice as high, the initial kinetic energy of the second projectile (and hence the square of its speed) must be four times that of the first. Thus, the speed of the second projectile must have been twice the speed of the first projectile, because the square root of 4 is 2.
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Final answer:
An increase in thermal energy causes molecules to move more rapidly and vibrate more quickly. Higher temperatures affect the distribution of kinetic energies and can cause phase changes.
Explanation:
When thermal energy increases, molecules gain more kinetic energy and therefore move more rapidly. This increased kinetic energy causes molecules to vibrate more quickly. As a result, the temperature of the substance increases. Higher temperatures also affect the distribution of kinetic energies among the molecules in a substance. At higher temperatures, more molecules have the necessary kinetic energy to escape from a liquid to the gas phase.
Additionally, increasing thermal energy can cause phase changes in a substance, such as melting or vaporization, where additional energy is used to loosen bonds between molecules or atoms without changing the temperature. Thus, adding thermal energy can lead to the melting or vaporization of a substance.
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Answers
B. price floor
C. price field
D. price ceiling
Answers
Answer:
B. Price floor
Explanation:
it is a price imposed by the government for a product , goods or commodity if the government feels that price is too low. In order to be effective Price floor must be more than the equilibrium price .
b. Nuclear
c. Chemical
d. Electromagnetic
A wrecking ball on its way down before it hits a building is an example of ________ energy being converted into ________ energy.
a. kinetic, potential
b. potential, kinetic
c. potential, potential
d. kinetic, mechanical
A wrecking ball on its way down before it hits a building is an example of ________ energy being converted into ...
Answers
The answer to the first question is A. Heat, because in order to heat up or catch fire, the molecules have to vibrate quickly.
This wrecking ball is an example of potential energy being converted into kinetic energy, so your answer is B. potential, kinetic.
Source: I have had to answer both questions before.
Answers
The word originates from Greek 'chion' meaning snow and 'phobos'
meaning fear, aversion or dread. People with Chionophobia often
understand that their fear is unfounded and weird. However, they
are unable to control it.
Another contributor was the first to answer the question correctly, and in fact,
I learned the answer from that earlier post. If I could only remember who it was,
I would give them a big shout-out. Their answer was deleted by a moderator
because it didn't have an explanation with it.
b.Motor skills are separate, innate abilities. "
c.Children acquire motor skills on a fixed maturational timetable.
d.Children acquire motor skills in the sequence implied by motor norms.
Answers
Answer:
(a) Motor skills are interrelated.
Explanation:
As per the question,
Motor development:
It is defined as the development of movement abilities such as the development of a child's bones, muscles and ability to move around and manipulate his or her environment.
Importance of a Motor Development Model are:
(1) Helps us make sense of developmental changes
(2) Provides a framework for observing the change
(3) Helps us include important factors of motor behavior in our observations.
Hence, Only option (a) is correct.