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Nitella [24]
1 year ago
8

0Aphysical education class is doing jumping jacks for 60 seconds. How many seconds remain if 18 seconds haveSed?24Maiklstand tot

umSave and ExitNextSubmit
Mathematics
1 answer:
Vaselesa [24]1 year ago
8 0

If the initial time was 60 seconds and 18 seconds have passed,

60-18=42

There would be 42 seconds left.

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To play basketball with her friends, Evangeline needs to pump air in her ball, which is completely deflated. Before inflating it
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Answer:

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Step-by-step explanation:

Solution:-

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                            m2 = 0.624 kg

- The amount of air ( mass of air ) pumped into the ball can be determined from simple arithmetic between inflated and deflated weights of the ball.

                           m_air = Δm = m2 - m1

                           m_air = 0.624 - 0.615

                           m_air = 0.009 kg

- We are to assume that the inflated ball takes a shape of a perfect sphere with radius r = 0.24 m. The volume of the inflated ( air filled ) ball can be determined using the volume of sphere formula:

                         V_air = 4*π*r^3 / 3

                         V_air = 4*π*0.24^3 / 3

                         V_air = 0.05790 m^3  

 

- The density of air ( ρ_air ) is the ratio of mass of air and the volume occupied by air. Expressed as follows:

                         ρ_air = m_air / V_air

                         ρ_air = 0.009 / 0.05790

Answer:            ρ_air = 0.15544 kg/m^3                      

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Answer:

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Step-by-step explanation:

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