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3 years ago

Give definition of measurement

2 answers:

8 0

Measurement is defined as the act of measuring or the size of something. An example of measurement means the use of a ruler to determine the length of a piece of paper. An example of measurement is 15" by 25".

pshichka [43]3 years ago

7 0

Answer: A time span or amount of something

Explanation: when reaching for a goal u have to measure how long something will take and pace yourself

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ASK YOUR TEACHER A 2.0-kg mass swings at the end of a light string with the length of 3.0 m. Its speed at the lowest point on it

Nadya [2.5K]

Answer:

K_b = 78 J

Explanation:

For this exercise we can use the conservation of energy relations

starting point. Lowest of the trajectory

Em₀ = K = ½ mv²

final point. When it is at tea = 50º

Em_f = K + U

Em_f = ½ m v_b² + m g h

where h is the height from the lowest point

h = L - L cos 50

Em_f = ½ m v_b² + mg L (1 - cos50)

energy be conserve

Em₀ = Em_f

½ mv² = ½ m v_b² + mg L (1 - cos50)

K_b = ½ m v_b² + mg L (1 - cos50)

let's calculate

K_b = ½ 2.0 6.0² + 2.0 9.8 6.0 (1 - cos50)

K_b = 36 +42.0

K_b = 78 J

4 0

3 years ago

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4 years ago

What is physical quantity ? Give examples.

Dahasolnce [82]

Explanation:

physical quantity is any physical property that can be qualified that,is, be measured using numbers e.g mass, amount of substance,time and length

7 0

3 years ago

When he reaches the bottom, 4.2 m below his starting point, his speed is 2.2 m/s . By how much has thermal energy increased duri

Advocard [28]

Complete question:

A fireman of mass 80 kg slides down a pole. When he reaches the bottom, 4.2 m below his starting point, his speed is 2.2 m/s. By how much has thermal energy increased during his slide?

Answer:

The thermal energy increased by 3,099.2 J

Explanation:

Given;

mass of the fireman, m = 80 kg

initial position of the fireman, hi = 4.2 m

final speed, v = 2.2 m/s

The change in the thermal energy is calculated as;

ΔE + (K.Ef - K.Ei) + (Uf - Ui) = 0

where;

ΔE is the change in the thermal energy

K.Ef is the final kinetic energy

K.Ei is the initial kinetic energy

Uf is the final potential energy

Ui is the initial potential energy

$\Delta E_{th} + (\frac{1}{2} mv_f^2 - \frac{1}{2} mv_i^2) + (mgh_f - mgh_i)=0\\\\initial \ velocity, \ v_i = 0\\final \ height , \ h_f = o\\\\\Delta E_{th} + (\frac{1}{2} mv_f^2) + ( - mgh_i)=0\\\\\Delta E_{th} + \frac{1}{2} mv_f^2 - mgh_i = 0\\\\\Delta E_{th} =mgh_i - \frac{1}{2} mv_f^2\\\\\Delta E_{th} = 80 \times 9.8 \times 4.2 \ \ - \ \ \frac{1}{2} \times 80 \times (2.2)^2 \\\\\Delta E_{th} = 3292.8 \ J \ - \ 193.6 \ J\\\\\Delta E_{th} = 3,099.2 \ J$

3 0

3 years ago

Give definition of measurement ​

Give definition of measurement