Answer: Total volume of fat in his body is 
Explanation:
Density is defined as the mass contained per unit volume.
Given:
Density of fat cells = 
mass of fat cells = 20% of the mass of a 70 kg student's body is fat= 
Volume of fat = ?
Putting in the values we get:
Thus total volume of fat in his body is
Answer: Option D.
Explanation: The question states that there's a tornado WARNING in the area. This means John needs to take cover immediately. Staying on the road can be dangerous for both John and other drivers. Chasing the tornado is just stupid. Going to the top of a bridge is incredibly dangerous as he can easily get knocked off by strong wind and debris. John's best bet is to find a low flat area so the storm can do the least amount of danage to him and hopefully debris will fly over him.
Of the transfer of momentum
Well, when your arms are put forward, they do help you very much on doing the curl ups. It doesn't make anything easier, it just makes it to the point that you're not as uncomfortable. The reason why the exert less force is because of the transfer of momentum. There would not be enough momentum to help you get through that lift if your hands are put forward.
Answer:
C. Physical hazard
Explanation:
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The man is most likely suffering from memory loss.
