All categories

3 years ago

Which best describes the main difference between science and pseudoscience?

Physics

2 answers:

Kipish [7]3 years ago

6 0

C. Science is objective, and pseudoscience is subjective

Natali [406]3 years ago

5 0

It's the third option

You might be interested in

A block of mass 0.1 kg is attached to a spring of spring constant 21 N/m on a frictionless track. The block moves in simple harm

bogdanovich [222]

Answer:

A) 2.75 m/s B) 0.1911 m C) 0.109 s

Explanation:

mass of block = M =0.1 kg

spring constant = k = 21 N/m

amplitude = A = 0.19 m

mass of bullet = m = 1.45 g = 0.00145 kg

velocity of bullet = vᵇ = 68 m/s

as we know:

Angular frequency of S.H.M = ω₀ = $\sqrt\frac{k}{M}$

= $\sqrt\frac{21}{0.1}$

= 14.49 rad/sec

<h3>A) Speed of the block immediately before the collision:</h3>

displacement of Simple Harmonic Motion is given as:

$x = A sin (\omega t + \phi)\\$

Differentiating this to find speed of the block immediately before the collision:

$v=\frac{dx}{dt}= A\omega_{o} cos (\omega_{o}t =\phi}\\$

As bullet strikes at equilibrium position so,

φ = 0

t= 2nπ

⇒ cos (ω₀t + φ) = 1

⇒ $v= A\omega_{o}$

$v=(.19)(14.49)\\v= 2.75 ms^{-1}$

<h3>B) If the simple harmonic motion after the collision is described by x = B sin(ωt + φ), new amplitude B:</h3>

S.H.M after collision is given as :

$x= Bsin(\omega t + \phi)$

To find B, consider law of conservation of energy

$K.E = P.E\\K.E= \frac{1}{2}(m+M)v^{2} \\P.E = \frac{1}{2} kB^{2}$

$\frac{m+M}{k} v^{2} = B^{2} \\B =\sqrt\frac{m+M}{k} v\\B = \sqrt\frac{.00145+0.1}{21} (2.75)\\B = .1911m$

<h3>C) Time taken by the block to reach maximum amplitude after the collision:</h3>

Time period S.H.M is given as:

$T=2\pi \sqrt\frac{m}{k}\\ for given case\\m= m=M\\then\\T=2\pi \sqrt\frac{m+M}{k}$

Collision occurred at equilibrium position so time taken by block to reach maximum amplitude is equal to one fourth of total time period

$T=\frac{\pi }{2}\sqrt\frac{m+M}{k} \\T=0.109 sec$

5 0

4 years ago

1. According to Dalton's Atomic theory which statement is correct from the following statement?

vlabodo [156]

Answer:

the mass is distributed uniformly in an atom

5 0

3 years ago

Read 2 more answers

A rigid container equipped with a stirring device contains 2.8 kg of motor oil. Determine the rate of specific energy increase w

yKpoI14uk [10]

Answer:

Rate of change of specific energy will be $=\frac{2.5}{2.8}=0.8928j/kgsec$

Explanation:

We have given mass of the motor oil m = 2.8 kg

Heat is transferred to the oil at a rate Q = 1 W

Power supply by stemming device $W=-1.5Watt$

Applying first law to the device

$Q=W+dU$

$1=-1.5+dU$

$dU=2.5$

Rate of change of specific energy will be $=\frac{2.5}{2.8}=0.8928j/kgsec$

6 0

4 years ago

What three quantities does Newton’s 2nd law relate?

Yuki888 [10]

Answer:

force, mass, and acceleration

Explanation:

According to Newton's 2nd law, the acceleration of an object depends on the net force and the mass of the object. The equation for the 2nd law is Force = mass * acceleration.

7 0

4 years ago

What happens to the piece of plastic?

zalisa [80]

Answer:

it reheated and use form another

3 0

3 years ago

Read 2 more answers