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3 years ago

PLEASE HELP ME WITH THIS ONE QUESTION

Physics

1 answer:

WITCHER [35]3 years ago

4 0

Answer:

the correct is D

Explanation:

In the calorimetry exercises, if there are no losses, we assume that all the heat lost by one body is absorbed by the other, but if there are losses

Q_ {yielded} = Q_ {absent} + Q_ {lost}

Since energy cannot be created or destroyed, they only ask to change, therefore the term of the absorbed heat must decrease, consequently the final temperature of the system is lower when there is loss of energy.

When checking the answers, the correct one is D

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Read 2 more answers

A kid walks 500 m North and then 300 m south.

Aleonysh [2.5K]

Explanation:

for the walking distance it did not matter in what direction the kid walked.

a. the distance of the walk is 500 + 300 = 800 m

b. the kid ended up 500-300=200 m north of the original point.

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3 years ago

A bullet with a mass of 4.5 g is moving with a speed of 300 m/s (with respect to the ground) when it collides with a rod with a

Law Incorporation [45]

Answer:

ω = 5.41 rad/s

Explanation:

Since the rod is rotating around its axis, angular momentum will play part in this question.

The conservation of angular momentum implies that

$L_1 = L_2$

So, the initial angular momentum is

$L_1 = m_b v_b \frac{L}{4} = (4.5\times 10^{-3}~{\rm kg})(300~{\rm m/s})(\frac{0.25}{4}~{\rm m}) = 0.0844~{\rm kg.m^2/s}$

The final angular momentum includes the rod and the bullet together. So,

$L_2 = I\omega\\I = I_{rod} + I_{bullet} = \frac{1}{12}m_r L^2 + m_b(\frac{L}{4})^2 = \frac{1}{12}3(0.25)^2 + (4.5\times 10^{-3})(\frac{0.25}{4})^2 = 0.0156~{\rm kg.m^2}\\L_2 = L_1 = I\omega\\0.0844 = 0.0156\omega\\\omega = 5.41~{\rm rad/s}$

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3 years ago

How is a theory different from a law?

sergey [27]

Answer:

D. Theories can be modified over time, while laws cannot be modified over time.

Explanation:

a scientific theory is an in-depth explanation of the observed phenomenon. A law is a statement about an observed phenomenon or a unifying concept, according to Kennesaw State University

A theory is an explanation for what has been shown many times. A scientific law is a relationship in nature that has been proved many times and there are no exceptions

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3 years ago