Scientific knowledge changes when which of the following occurs?A. When knew evidence that challenges old ideas is presented.
B. When scientist decide to change their theories and ideas in response to societal pressure.
C. Scientific knowledge does not change. Once and idea or theory is established it is permanent.

Answers

Answer 1

Answer: A. When new evidence that challenges old ideas is presented.

Think about the other choices, they do not make any sense. You cannot change your ideas just because people want something to be a certain way. And you have to change your idea if you're proven wrong.

Answer 2

Answer:

Answer:

Explanation:it is correct

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two truckers are traveling directly away from each other at the same speed. If one trucker sounds her horn at a frequency of 206 Hz, and the other trucker hears a frequency of 189 Hz, determine the speed of the trucks. Use the speed of sound as 343 m/s. m/s

Answers

Answer:

v' = 14.76 m/s

Explanation:

given,

frequency of the one truck = 206 Hz

apparent frequency ,f' = 189 Hz

speed of sound, v = 343 m/s

speed of observer (v_o)and source (v_s) = v'

now, using Doppler's effect

$f' = (v-v_o)/(v+v_s)\ f$

$f' = (v- v')/(v+v')\ f$

$189 = (343- v')/(343+v')\ 206$

$0.9174= (343- v')/(343+v')$

314.69 + 0.9174 v' = 343 - v'

1.9174 v' = 28.30

v' = 14.76 m/s

hence, the speed of the truck is equal to 14.76 m/s

Which stars can be smaller than the Sun? Select all that apply.a. neutron stars
b. red giants
c. white dwarfs
d. main sequence stars

Answers

Answer:

a and d are correct

Explanation:

a. neutron stars

d. main sequence stars

Are smaller than the sun but I'm not sure about white dwarfs because a typical white dwarf is about as massive as the Sun, yet only slightly bigger than the Earth.

Which term best describes the important pieces of information that scientists gather and record during an experiment?

Answers

Data. Anything a scientist measures or records for an experiment is considered data, very important information.

All atoms of the same element must have the same number of

Answers

Explanation:

Atomic number is defined as the total number of protons present in an element.

Each element of the periodic table has different atomic number because each of them have different number of protons.

For example, atomic number of Na is 11, and atomic number of Ca is 20.

On the other hand, atomic mass is the sum of total number of protons and neutrons present in an atom.

For example, atomic mass of nitrogen is 14 that is, it contains 7 protons and 7 neutrons.

Thus, we can conclude that all atoms of the same element must have the same number of protons.

Answer: Protons

Explanation: The number of protons corresponds to the atomic number.

What causes an electric current in a wire? A.
Electric fields cause atoms to move in the wire.

B.
Electrons flow because of electrical attraction and repulsion.

C.
Electrons move because of heat.

D.
Electrons build up in the wire and create a charge

Answers

The correct answer is B. Electrons flow because of electrical attraction and repulsion.

Answer:

Electrons flow because of electrical attraction and repulsion.

Explanation:

In 3.0 seconds, a wave generator produces 15 pulses that spread over a distance of 45 centimeters. Calculate its period.0.022 s

0.066 s

0.20 s

0.33 s

Answers

Period = (time) / (number of pulses)

= (3 sec) / (15 pulses)

= 0.2 sec/pulse

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