a small dog is trained to jump straight up a distance of 1.2m. How much kinetic energy does the 7.2kg dog need to jump this high? ( the acceleration due to gravity is 9.8m/s2)
Answers
Energy = Force * Distance
According to the question,
Distance = 1.2 m
But we are not given any value for the Force
However, we know that,
Force = Mass * Acceleration
According to the question,
Mass = 7.2kg
Acceleration = 9.8 m/s²
Therefore,
Force = 7.2 * 9.8
Force = 70.56 Newton
Remember, what we are looking for is the Energy
Energy = Force * Distance
Now we know that Force = 70.56 Newton
Distance = 1.2 m
Therefore,
Energy = 70.56 * 1.2
Energy = 84.7 Joules
her potential energy is ...
(m) ·(g) ·(h)
= (7.2 kg) ·(9.8 m/s² ) ·(1.2 m)
= 84.7 joules .
If she doesn't leave the ground with AT LEAST that much
kinetic energy, she'll never make it to 1.2 m.
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Can somebody plz answer this correct quickly!!!! :D(WILL MARK BRAINLIEST) (Use google idc)
whats the magnitude in N ?
(b) Find the centripetal acceleration of the electron.
whats the magnitude in m/s2
Answers
the electron and proton, and then we need to know the electron's mass.
I'm beginning to get the creepy feeling that, in return for the generous
5 points, you also want me to go and look these up so I can use them
in calculations ... go and collect my own straw to make the bricks with,
as it were.
Ok, Rameses:
Elementary charge . . . . . 1.6 x 10⁻¹⁹ coulomb
negative on the electron
plussitive on the proton
Electron rest-mass . . . . . 9.11 x 10⁻³¹ kg
a). The force between two charges is
F = (9 x 10⁹) Q₁ Q₂ / R²
= (9 x 10⁹ m/farad) (-1.6 x 10⁻¹⁹C) (1.6 x 10⁻¹⁹C) / (5.35 x 10⁻¹¹m)²
= ( -2.304 x 10⁻²⁸) / (5.35 x 10⁻¹¹)²
= 8.05 x 10⁻⁸ Newton .
b). Centripetal acceleration =
v² / r .
A = (2.03 x 10⁶)² / (5.35 x 10⁻¹¹)
= 7.7 x 10²² m/s² .
That's an enormous acceleration ... about 7.85 x 10²¹ G's !
More than enough to cause the poor electron to lose its lunch.
It would be so easy to check this work of mine ...
First I calculated the force, then I calculated the centripetal acceleration.
I didn't use either answer to find the other one, and I didn't use " F = MA "
either.
I could just take the ' F ' that I found, and the 'A' that I found, and the
electron mass that I looked up, and mash the numbers together to see
whether F = M A .
I'm going to leave that step for you. Good luck !
b. amps/division
c. seconds/division
d. ohms/divisionthe horizontal sweep of an oscilloscope is rated in seconds/division.
Answers
Answer:
Second division
Explanation:
Answers
Answer:
the force of adhesion.
Explanation:
The attractive force between the two types of molecules is called adhesive force.
So, the force between the liquid molecule and the solid molecule is adhesive in nature.
The attractive force acts between the two same type of molecules is called cohesive force.
Answers
Answer:
The thermal energy generated by the friction as the mass slides down the ramp is .
Explanation:
Given:
The mass of the object is,
The angle of the ramp is,
The initial height of the object on the ramp is,
The final velocity of the object is,
When the object is at rest on the ramp, its total energy is potential energy. When it moves down the ramp its kinetic energy is increased and potential energy is decreased and a part of its energy is lost to overcome the force of friction. Finally, when it is at the bottom of the ramp, its total energy becomes only kinetic energy.
The total energy of the object at a height on the ramp is given by
When the object is at the bottom of the ramp, its total energy is given by
So, the energy that is lost as thermal energy is given by
Answers
Answer:
Valence electrons
Explanation:
The valence electrons are found in the outermost shell of an atom. They are the most loosely held electrons found within an atom. These valence electrons are involved and are used to form bonds when atoms combines together.
The energy required to remove these loosely held electrons is relatively low compared to electrons located in the inner orbitals. This is why when atoms combines, they use the outermost electrons to form bonds and mimic stable atoms like those of the noble gases.
Answers
Sample response on Edu is:
In the 100-m sprint, the displacement is 100 meters and the distance is 100 meters. This means speed and velocity are the same for the 100-m sprint. In the 400-m sprint, the distance is 400-m, but the runners stop at the same place they start so the displacement is zero. Zero displacement means zero velocity.