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Readme [11.4K]
3 years ago
9

A block has acceleration a when pulled by a string. if two identical blocks are glued together and pulled with twice the origina

l force, what will their acceleration be?
Physics
1 answer:
WINSTONCH [101]3 years ago
5 0
<span>F = m x a 2F = 2m x a a = 2F / 2m a = F/m The acceleration would be the same.</span>
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Newton's law of cooling says that the rate of cooling of an object is proportional to the difference between the temperature of
Feliz [49]

Answer:

T=T_o+C'e^{-kt}

Explanation:

Newton's law of cooling

Rate of cooling

\dfrac{dT}{dt}\alpha(T-T_o)

Where To is the surrounding temperature

T is object temperature at any time t

now by removing proportionality sign

\dfrac{dT}{dt}=-k(T-T_o)

Now by separating variables

\dfrac{dT}{(T-T_o)}=-k\ dt

\int \dfrac{dT}{(T-T_o)}=-\int k\ dt

So

\ln (T-T_o)=- k\ t +C

Where C is constant

T=T_o+C'e^{-kt}

C' is also a constant and it can be find by using boundary conditions.

4 0
3 years ago
A cart loaded with bricks has a total mass of 22.2 kg and is pulled at constant speed by a rope. The rope is inclined at 27.5 ◦
musickatia [10]

Answer:

W = 1.432 KJ

Explanation:

given,

mass = 22.2 Kg

angle of the rope = 27.5°

distance on the ground = 24 m

kinetic friction= μ = 0.32

acceleration due to gravity, g = 9.8 m/s²

Work done = ?

W = F d cosθ

a = 0 because it is moving with constant speed

equating all the forces acting  in x direction

F cosθ = F friction = μN  

equating all the forces acting  in y direction

F sinθ + N -mg =0

now,

N = mg - F sinθ

putting value of N

F cosθ = μ mg -μ F sinθ

F (cosθ + μsinθ ) = μ mg

F = \dfrac{\mu mg}{cos\theta + \mu sin\theta}

F = \dfrac{0.32 \times 22.2 \times 9.8}{cos 27.5^0+0.32 \times sin27.5^0}

F =67.28 N

now,

W=F d cosθ

W =67.28 x 24 x cos(27.5)

W =1432.27 J

W = 1.432 KJ

7 0
3 years ago
Read 2 more answers
The top speed you will ever need to go in a parking lot is_
Kruka [31]

10 mph i jus got it right on the test

3 0
3 years ago
Hey guys, is this question for a series circuit or for parallel?
Mandarinka [93]

Answer:

I need help with the same question

Explanation:

3 0
3 years ago
The charged particles in the beams that Thomson studied came from atoms. As these particles moved away from their original atoms
aalyn [17]

The question to the above information is;

What is the best use of an atomic model to explain the charge of the particles in Thomson's beams?

Answer;

An atom's smaller negative particles are at a distance from the central positive particles, so the negative particles are easier to remove.

Explanation;

-Atoms are comprised of a nucleus consisting of protons (red) and neutrons (blue). The number of orbiting electrons is the same as the number of protons and is termed the "atomic number" of the element.

J.J. Thomson discovered the electron. Atoms are neutral overall, therefore in Thomson’s ‘plum pudding model’:

  • atoms are spheres of positive charge
  • electrons are dotted around inside
5 0
3 years ago
Read 2 more answers
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