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Oksanka [162]
4 years ago
15

Define Newton's Second Law

Physics
1 answer:
True [87]4 years ago
4 0

Answer:

F_{net} = ma

Explanation:

Newton's second law states that the acceleration of an object is proportional to the net force exerted on it, according to the formula:

F_{net} = ma

where

F_{net} is the net force on the object

m is its mass

a is its acceleration

The other statements are wrong because they represent other laws of physics, namely:

When an object puts a force on another object, the second object puts a force back on the first, equal in magnitude but opposite in direction  --> Newton's third law

The total energy through any process is conserved  --> law of conservation of energy

Objects tend to keep their motion unless acted upon by an unbalanced outside force --> Newton's first law

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A paint brush is dropped from the top of a tall ladder and free falls to the ground. What changes, if any, would be observed of
muminat

Answer:

Explanation:

As the paint brush is dropped from the top of a tall ladder it started free falling

i.e. velocity of brush increases as it falls down due to the acceleration provided by gravity.

We know acceleration due to gravity is the attraction experienced by the object due to earth attraction

Value of acceleration due to gravity is constant i.e. 9.8\ m/s^2

Therefore the correct choice is

velocity is increasing and acceleration is constant

4 0
4 years ago
A 26.4 g silver ring (cp = 234 J/kg·°C) is heated to a temperature of 66.2°C and then placed in a calorimeter containing 4.94 ✕
Slav-nsk [51]

Answer:

The final temperature of the mixture = 64.834 °C.

Explanation:

Heat lost by the silver ring = heat gained by the water + heat transferred to the surrounding.

c₁m₁(t₁-t₃) = c₂m₂(t₃-t₂) + Q..............Equation 1

Where c₁ = specific heat capacity of the silver copper, m₁ = mass of the silver copper, t₁ = initial temperature of the silver copper, t₃ = final temperature of the mixture. c₂ = specific heat capacity of water, t₂ = initial temperature of water, m₂ = mass of water, Q = energy transferred to the surrounding.

making t₃ the subject of the equation,

t₃ = [c₁m₁t₁+c₂m₂t₂-Q]/(c₁m₁+c₂m₂)........................ Equation 2

Given: c₁ = 234 J/kg.°C, m₁ = 26.4 g, t₁ = 66.2 °C, c₂ = 4200 J/K.°C, m₂ = 4.92×10⁻² kg, t₂ = 24.0 °C, Q = 0.136 J.

Substituting into equation 2

t₃ = [(234×26.4×66.2)+(4200×0.0492×24)-0.136]/[(234×26.4)+(4200×0.0492)]

t₃ = (408957.12+4959.36-0.136)/(6177.6+206.64)

t₃ = (413916.48-0.136)/6384.24

t₃ = 413916.34/6384.24

Thus the final temperature of the mixture = 64.834 °C.

6 0
3 years ago
What would the speed of this wave be?
valentinak56 [21]

Answer:

c) 100,000 m/s

Explanation:

You need to take the same wave length from the top graph and bottom one, so let's take half a wave length then in the top one that is 0.005, but in the bottom one it's 2000/4 = 500 because they are smaller and there are 4 half waves before you get to 2000, whereas in the top one there is 1 half wave before you get to 0.005 on the graph.

Now use speed = distance / time

speed = 500 / 0.005 = 100 000 m/s

7 0
3 years ago
Which of the following is not an example of kinetic energy?
ycow [4]
Only first is kinetic.
So 2-3-4 are not
5 0
4 years ago
Read 2 more answers
Help plssss ineed answers....
muminat

Answer:

Concept: Physics

  • Convex stands for converging which can form real and virtual
  • Hence C is your answer
5 0
3 years ago
Read 2 more answers
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