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3 years ago

Which of the following scientific terms has the most evidence and observations?

1 answer:

7 0

The correct answer should be B. a scientific law. A hypothesis is a belief by the scientist that may or may not be proven so it exists before evidence and observation, while a theory comes later. However, a law is observation itself and is always evidence of itself. There is no belief or lack of knowledge as to what will happen when it comes to laws. The law of action and reaction has plenty evidence and can easily be observed.

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What is the STANDARD unit of measurement for velocity in Physics?

rusak2 [61]

Answer:

$m. {s}^{ - 1}$

4 0

3 years ago

Two loudspeakers are located 3.0 m apart on the stage of an auditorium. A listener at point P is seated 19.0 m from one speaker

Amanda [17]

Answer:

The frequencies that the listener at P will hear a maximum intensity are: 85.75 Hz, 171.5 Hz, 257.25 Hz and 343 Hz.

Explanation:

Path Difference Δx is given as: nλ

where λ = $\frac{v}{f}$

Δx can be re-written as: n× $\frac{v}{f}$

where;

n = integer

v = speed of sound = 343 m/s

f = frequency

Δx = 19.0 m - 15.0 m

Δx = 4.0 m

$4.0 m =$ $\frac{n*343}{f}$

f = $\frac{n*343}{4}$

f = n × 85.75 Hz

Now; n = 1, 2, 3, 4 ; the frequencies that the listener at P will hear the maximum intensity will be

when n= 1

f = 1 × 85.75 Hz

f = 85.75 Hz

when n= 2

f = 2 × 85.75 Hz

f = 171.5 Hz

when n= 3

f = 3 × 85.75 Hz

f = 257.25 Hz

when n= 4

f = 4 × 85.75 Hz

f = 343 Hz

∴ the frequencies that the listener at P will hear the maximum intensity will be : 85.75 Hz, 171.5 Hz, 257.25 Hz and 343 Hz for n =1,2,3, and 4 respectively.

7 0

3 years ago

Why isn't space expanding within systems such as our solar system or the milky way?

mezya [45]

The main reason for this is gravity. Gravity between objects in our solar system and milky way is strong enough to counteract this expansion. Hope it helps.

4 0

4 years ago

The velocity of a car teduces from 30 km/h as the car approaches a stop sigh. Is this an example of positive or negative acceler

tresset_1 [31]

Answer:

The stopping car has negative acceleration.

Explanation:

We know acceleration is the rate of change of velocity. That is

Acceleration(a) = ( Final velocity - Initial velocity )/ Time taken.

Here Final velocity = 0 km/h( car stops) and initial velocity = 30 km/h

So acceleration = (0-30)/time = -30/ time

Time is always positive , so -30/time is negative, so the stopping car has negative acceleration.

5 0

3 years ago

Is light an electromagnetic wave? why?

djverab [1.8K]

read it carefuly you will understand why?????

8 0

3 years ago