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Ask QuestionPosted by Lalthan Mawii 4 years, 2 months ago
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Yogita Ingle 4 years, 2 months ago
Relative Error
The relative error is the ratio of the mean absolute error Δamean to the mean value amean of the quantity measured.
i.e., Relative error = Δamean/ amean
Posted by Raghuvanshi Prem Pawan 4 years, 2 months ago
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Yogita Ingle 4 years, 2 months ago
The proportionality constant which relates the energy of a photon to the frequency of its related electromagnetic wave is known as Planck’s constant.
Planck′s;constant(h)= Energy(E)/ frequency(upsilon)
The dimensional formula of energy = [M1L2T-2]
The dimensional formula of frequency = [M0L0T-1]
The dimensional formula of Planck’s constant = [M1L2T-2]/ [M0L0T-1]
Therefore, the dimensional formula of Planck’s constant is [M1L2T-1]
Posted by Lalthan Mawii 4 years, 2 months ago
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Yogita Ingle 4 years, 2 months ago
3.6 km/m 2 = 1m /s2
Hence 45 km /m2 ÷ 3.6 = 12.5 m /s2
Posted by Khushi Singhal 4 years, 2 months ago
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Aseem Mahajan 4 years, 2 months ago
= ∆R/R = 0.2/20 + 0.2/1.2 = ∆R/R = 0.01 + 0.16 = ∆R/R = 0.17
Percentage error = ∆R/R × 100 = 0.17 × 100 = 17%
Posted by Aadya Singh 4 years, 2 months ago
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Posted by Aadya Singh 4 years, 2 months ago
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Aadya Singh 4 years, 2 months ago
Aseem Mahajan 4 years, 2 months ago
Yogita Ingle 4 years, 2 months ago
When the magnitude of a vector is zero, it is known as a zero vector. Zero vector has an arbitrary direction.
Examples: (i) Position vector of origin is zero vector.
(ii) If a particle is at rest then displacement of the particle is zero vector.
(iii) Acceleration of uniform motion is zero vector.
Posted by Aadya Singh 4 years, 2 months ago
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Aadya Singh 4 years, 2 months ago
Aadya Singh 4 years, 2 months ago
Posted by Aadya Singh 4 years, 2 months ago
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Posted by Aadya Singh 4 years, 2 months ago
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Aseem Mahajan 4 years, 2 months ago
Yogita Ingle 4 years, 2 months ago
Position Vector: Position vector of an object at time t is the position of the object relative to the origin. It is represented by a straight line between the origin and the position at time t.
Mandeep Kaur 4 years, 2 months ago
Posted by Sheela Choudhary 4 years, 2 months ago
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Posted by Jaya Jeevan 4 years, 2 months ago
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Yogita Ingle 4 years, 2 months ago
Absolute Error
Absolute error is the difference between measured or inferred value and the actual value of a quantity. The absolute error is inadequate due to the fact that it does not give any details regarding the importance of the error. While measuring distances between cities kilometers apart, an error of a few centimeters is negligible and is irrelevant. Consider another case where an error of centimeters when measuring small machine parts is a very significant error. Both the errors are in the order of centimeters but the second error is more severe than the first one.
Relative Error
The relative error is defined as the ratio of the absolute error of the measurement to the actual measurement. Using this method we can determine the magnitude of the absolute error in terms of the actual size of the measurement. If the true measurement of the object is not known, then the relative error can be found using the measured value. The relative error gives an indication of how good measurement is relative to the size of the object being measured.
Posted by Jaya Jeevan 4 years, 2 months ago
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Yogita Ingle 4 years, 2 months ago
- Absolute Error: The magnitude of the difference between the true value of the quantity and the individual measurement value is called absolute error of the measurement. It is denoted by |Δa| (or Mod of Delta a). The mod value is always positive even if Δa is negative. The individual errors are:
Δa1 = amean - a1, Δa2 = amean - a2, ……. ,Δan = amean – an
- Mean absolute error is the arithmetic mean of all absolute errors. It is represented by Δamean.
Δamean = (|Δa1| + |Δa2| +|Δa3| + …. +|Δan|) / n =
For single measurement, the value of ‘a’ is always in the range amean± Δamean
So, a = amean ± Δamean Or amean - Δamean< a <amean + Δamean
- Relative Error: It is the ratio of mean absolute error to the mean value of the quantity measured.
Relative Error = Δamean / amean
- Percentage Error: It is the relative error expressed in percentage. It is denoted by δa.
δa = (Δamean / amean) x 100%
Posted by Kritan Sharma 3 years, 6 months ago
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Sia ? 3 years, 6 months ago
the extent of the area or subject matter that something deals with or to which it is relevant.
Posted by Seraj Ali ??? 4 years, 2 months ago
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Aadya Singh 4 years, 2 months ago
Posted by Durgesh Kumar Singh 4 years, 2 months ago
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Seraj Ali ??? 4 years, 2 months ago
⠀ 4 years, 2 months ago
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⠀ 4 years, 2 months ago
Posted by Abiya Studio Karungal Anlin 4 years, 2 months ago
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Yogita Ingle 4 years, 2 months ago
H = u²/(2g)
H = 20²/(2×10)
H = 20 m
The ball will reach 20 m high from the point of projection.
It reaches 20 + 20.5 = 40.5m high from the ground.
(b)
t1 = 2u/g
t1 = 2×20/10
t1 = 4 seconds
If v is the velocity with which it hits the ground then,
v = √(u² + 2aS)
v = √(20² + 2×10×25)
v = 30 m/s
v = u + at
t2 = (v - u)/g
t2 = (30 - 20)/10
t2 = 1 second
Time taken for it to hit the ground = t1 + t2
= 4 + 1
= 5 seconds
Note: I took g = 10m/s².
Posted by Tumula Chandra Mouli 4 years, 2 months ago
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Vishnu Sharma 4 years, 2 months ago
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Mukul Tyagi 4 years, 2 months ago
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Shrutika Patil 4 years, 2 months ago
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Aseem Mahajan 4 years, 2 months ago
1Thank You