A child is holding a cup of hot tea. His mother, a physicist, warns him not to start running with the tea. According to Newton's first law, why should his mother be concerned if the child started running?

Answers

Answer 1

Answer: if he stops running the tea is still going to be moving so it will spill on him.

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A communist country decides to give its people more economic freedom in an attempt to improve its failing economy. What outcome is the government most likely worried about in this case?

Answers

the outcome that should make the government worry is: people would want more political freedom since communist governments have lots of limits of people's political freedoms. in communist system, we don't even choose our own jobs and the government will decide what we should produce and what knowledge that we're allowed to get

Answer:

The beliefs of communism, most famously expressed by Karl Marx, center on the idea that inequality and suffering result from capitalism. Under capitalism, private business people and corporations own all the factories, equipment and other resources called "the means of production." These owners, according to communist doctrine, can then exploit workers, who are forced to sell their labor for wages. This is what the government most likely would be worried about. Because economic freedom means growth of private business owners which also means exploitation of workers.

As a diligent physics student, you carry out physics experiments at every opportunity. At this opportunity, you carry a 1.05 m 1.05 m long rod as you jog at 3.27 m/s 3.27 m/s , holding the rod perpendicular to your direction of motion. What is the strength of the magnetic field that is perpendicular to both the rod and your direction of motion and that induces an EMF of 0.275 mV 0.275 mV across the rod? Express the answer in milliteslas.

Answers

Answer:

The strength of the magnetic field is 0.08 mT

Explanation:

Given:

Length of rod $l = 1.05$ m

Velocity of rod $v = 3.27$ $(m)/(s)$

Induced emf $\epsilon = 0.275 * 10^(-3)$ V

According to the faraday's law

We know that the induced emf of rod is given by,

$\epsilon = Blv$

Where $B =$ magnetic field

For finding the magnetic field,

$B = (\epsilon )/(lv)$

$B = (0.275 * 10^(-3) )/(1.05 * 3.27)$

$B = 0.08 * 10^(-3)$

$B = 0.08$ mT

Therefore, the strength of the magnetic field is 0.08 mT

Calculate the change in momentum of a 45 kg runner who starts out at 1 m/s and speeds up to 3 m/s. Which anser choice is correct 90 kg⋅m/s 45 kg⋅m/s 135 kg⋅m/s 0 kg⋅m/s

Answers

momentum can also be defined in terms of newton second

that is P=F.V

now v =vf-vi

v=3 m/s-1m/s=2 m/s

now F=W=45 kg

therefore

change in momentum=F.v

P=45*2=90 kg.m/s

Which statement describes an atomic nucleus? An atomic nucleus is negatively charged. An atomic nucleus has no electrical charge. An atomic nucleus consists of mostly empty space. An atomic nucleus contains most of the atom’s mass.

Answers

The correct statement is: An atomic nucleus contains most of the atom’s mass.

All of the atom's neutrons and protons are in the nucleus, and the atom's electrons are outside the nucleus.

It would take more than 1,800 electrons to add up to the mass of one neutron or one proton.

But no atom has more than around 240 electrons, so we can see that almost all of the atom's mass is in the nucleus.

Final answer:

The atomic nucleus is best described as containing most of the atom's mass due to the presence of protons and neutrons, not as being negatively charged or mostly empty space.

Explanation:

The correct statement that describes an atomic nucleus is that an atomic nucleus contains most of the atom’s mass. This is due to the presence of protons and neutrons in the nucleus which carry nearly all the mass of the atom. The nucleus is not negatively charged, it carries a positive electric charge because of the protons. It is also not correct to say that it's mostly empty space as this describes the whole atom's structure where most of the space is taken up by electrons circling the nucleus.

Learn more about Atomic Nucleus here:

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What doesnt change despite what planet you're on

Answers

Your name, the amount of money in your pocket, and the mass of your body
both travel with you wherever you go, and don't depend on where you are.

mass does not change

To evaluate the observations you make, you must use ____. a. a hypothesis
c. measurements
b. critical thinking
d. models

Answers

Answer:

critical thinking

Explanation:

To evaluate the observations you make, you must use __critical thinking __.

Critical thinking is an way of thinking in which a person improves the quality of his thinking by skillfully analyzing, accessing and reconstructing it. It is self directed, self disciplined and self monitored and self corrective thinking. A well cultivated critical thinker raises vital questions, gathers and assesses relevant information, and thinks openmindedly.

It maybe both measurements and critical thinking

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