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3 years ago

How might a theory relate to a model in science?

2 answers:

8 0

These two things are related but can be independent, because it is possible to... of theories is studied formally in mathematical logic, especially in model theory.

MrRissso [65]3 years ago

5 0

A theory may be a set of statements that are developed through a method of continued abstractions. A theory is aimed toward a generalized statement aimed toward explaining a development. A model, on the opposite hand, maybe a purposeful illustration of reality. As you'll be able to see, each shares common parts in their definitions.

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The speed of a particle moving in a circle 2.0 m in radius increases at the constant rate of 4.4 m/s2. At an instant when the ma

Law Incorporation [45]

Answer:

The speed of the particle is 2.86 m/s

Explanation:

Given;

radius of the circular path, r = 2.0 m

tangential acceleration, $a_t$ = 4.4 m/s²

total magnitude of the acceleration, a = 6.0 m/s²

Total acceleration is the vector sum of tangential acceleration and radial acceleration

$a = \sqrt{a_c^2 + a_t^2}\\\\$

where;

$a_c$ is the radial acceleration

$a = \sqrt{a_c^2 + a_t^2}\\\\a^2 = a_c^2 + a_t^2\\\\a_c^2 = a^2 -a_t^2\\\\a_c = \sqrt{a^2 -a_t^2}\\\\a_c = \sqrt{6.0^2 -4.4^2}\\\\a_c = \sqrt{16.64}\\\\a_c = 4.08 \ m/s^2$

The radial acceleration relates to speed of particle in the following equations;

$a_c = \frac{v^2}{r}$

where;

v is the speed of the particle

$v^2 = a_c r\\\\v= \sqrt{a_c r} \\\\v = \sqrt{4.08 *2}\\\\v = 2.86 \ m/s$

Therefore, the speed of the particle is 2.86 m/s

6 0

4 years ago

Question 18 of 25

gayaneshka [121]

Answer:

Endothermic, because the reactants are lower in energy (C)

Explanation:

From the graph, you can see the energy of the products is higher than the energy of the reactants. If you recall that when the enthalpy change Eproducts is gretater than Ereactants, the reaction is said to be endothermic.

7 0

3 years ago

A solid rectangular block is formed by gluing together N congruent 1-cm cubes face to face. When the block is viewed so that thr

Lelu [443]

Answer:

462

Explanation:

231 cubes= half of N (because only 3 of the faces are visible, there are 6 faces altogether)

N=462

8 0

2 years ago

A car is driven at constant speed over a circular hill and then into a circular valley with the same radius. At the top of the h

VashaNatasha [74]

Answer:

therefore normal reaction on the driver from the seat when the car passes through the bottom of the valley= 1520.55 N

Explanation:

let speed be v

at top of hill

mg-N = mv^2/R ( N=0 at the top of the hill)

==> mg=mv^2/R

at bottom

N-mg=mv^2/R

therefore,

N = 2mg = 2*77.8*9.81= 1520.55 N

therefore normal reaction on the driver from the seat when the car passes through the bottom of the valley= 1520.55 N

7 0

3 years ago

Find the magnitude of the electrostatic force between a Na+ ion and a Cl− ion separated by 0.46 nm. N (b) Would the answer chang

adell [148]

Answer:

electrostatic force = 1.08 × $10^{-9}$ N

and if sodium ion replace by Li+ and chloride by Br− then there will be no change in electrostatic force

magnitude of electrostatic force will be same

Explanation:

given data

separation d = 0.46 nm = 4.6 × $10^{-10}$ m

to find out

electrostatic force between Na+ and Cl− ion

and if sodium ion replace by Li+ and chloride by Br−

solution

we know electrostatic force formula that is

electrostatic force = K ×Q1×Q2 / d² .........................1

here k is coulombs constant that is = 9 × $10^{9}$ and Q1 and Q2 is

charge that is Q1 = + 1.6 × $10^{-19}$ C

and Q2 = - 1.6 × $10^{-19}$ C

so put all these value in equation 1

electrostatic force = K ×Q1×Q2 / d²

electrostatic force = 9 × $10^{9}$ ×1.6 × $10^{-19}$ × -1.6 × $10^{-19}$ / (4.6 × $10^{-10}$ )²

so electrostatic force = 1.08 × $10^{-9}$ N

and if sodium ion replace by Li+ and chloride by Br− then there will be no change in electrostatic force

so magnitude of electrostatic force will be same

3 0

4 years ago