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emmasim [6.3K]
3 years ago
14

A student gives a brief push to a block of dry ice. A moment later, the block moves across a very smooth surface at a constant s

peed. When drawing the free body diagram for the block of dry ice moving at a constant speed, the forces that should be included are: (select all that apply)
a. gravity
b. force
c. force of friction
d. normal force
Physics
2 answers:
Monica [59]3 years ago
7 0
Hey There,

Question: "<span>A student gives a brief push to a block of dry ice. A moment later, the block moves across a very smooth surface at a constant speed. When drawing the free body diagram for the block of dry ice moving at a constant speed, the forces that should be included are: (select all that apply)"

Answer: C. Force Of Friction
              B. Force

If This Helps May I Have Brainliest?</span>
mel-nik [20]3 years ago
7 0
Hey there,

Your question states: <span>A student gives a brief push to a block of dry ice. A moment later, the block moves across a very smooth surface at a constant speed. When drawing the free body diagram for the block of dry ice moving at a constant speed, the forces that should be included are: (select all that apply)

Your correct answer would be "force of friction" and also just plain "force". The reason why it would just be "force" would be because the student gave a little push to the block of dry ice. This would be the motion of force. Now, the fact that the block continued to move at a constant speed would be because it had a "force of friction" which means that there is a substance that would attract the block of dry ice. That is why the "force of friction" would be your answer. Now, GRAVITY  would be involved in this case, the block of ice is already on the ground, this gravity would NOT be your answer.

Hope this helps.

~ Nerdy Astute 

</span>
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emmainna [20.7K]

Answer:

Mistakes, chaos theory.

Explanation:

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To accurately "predict" the weather, observation data needs to be collected from weather stations across the world. The data collected from the stations are too complex such that they can only be processed by supercomputers.

It is important to note that supercomputers used to predict weather are liable to make mistakes because the enormous challenge of weather forecasting is more than their capabilities.

In addition, there is a concept known as chaos theory. It explains how very small changes in initial weather conditions can change the final results. No thanks to chaos, meteorologists would not be able to predict weather accurately.  

This is the reason why the world still suffers from the incidence of surprise rain, storms and other weather events that could be devastating.

4 0
3 years ago
An iron nail is driven into a block of ice by a single blow of a hammer. The hammerhead has a mass of 0.5 kg and an initial spee
larisa [96]

Answer:

The ice melts mass is:

m_g=7.6x10^{-3} g

Explanation:

Kinetic Energy  

K_E = 1/2*m*v^2

K_E = 1/2*0.5kg*(3.2m/s)^2

K_E=2.56 kg*m^2/s^2

Heat gained by ice= mass(g) x 80 cal

( 1 cal = 4.184 *10^7er or g cm^2/ sec^2)

Assuming no loss in heat,  in the motion so both continue with temperature 0~C

To find so the mass (gm) of ice melted

m_g= 1/2 *(0.5*1000)*(3.2m/s)^2* 100*100 / (80*4.184*10^7)

m_g=7.6x10^{-3} g

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