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alisha [4.7K]
2 years ago
7

a bus carrying a band and all their equipment has an initial velocity of 14 m/s. it accelerates for 3seconds

Physics
1 answer:
irga5000 [103]2 years ago
8 0
-- If the acceleration is positive, then the velocity of the bus
at the end of the 3 seconds is greater than 14 m/s.

-- If the acceleration is negative, then the velocity of the bus
at the end of the 3 seconds is less than 14 m/s, and may even
have reversed direction.
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Which expression of distance uses SI units? A. 30 miles B. 16 kilograms C. 24 feet D. 500 meters
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Hi!

SI units are physical measurements which will be in the form of kilograms, second, kelvin, metres, etc.

Since kilograms measure the weight of an object, it is out. Miles and feet are not SI units, so they are also out. This only leaves one answer left!

Hopefully, this helps! =)
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Which of the following objects has the greatest kinetic energy?
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a baseball flying through the air at 90 miles per hour

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Quinn accelerates her skateboard along a straight path from 0 m/s to 4.0 m/s in 2.5 seconds. Calculate the acceleration of the s
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What volume of lead must be fastened underneath it to sink the wood in calm water so that its top is just even with the water le
astraxan [27]
The bouyancy force is:  

Since the wood-lead system is completely submerged, the bouyancy force 

 is FB = ĎwgVl + ĎwgVb, where Ďw is the density of water,Vl 

 is the volume of 

 the piece of lead and Vb is the volume of the wooden block. The weight of the

  combined lead and wooden block is: W = ĎlgVl + ĎbgVb. Since the system is 

 in equilibrium, the bouyancy force must be equal to the total weight: 

 ĎwgVl + ĎwgVb = ĎlgVl + ĎbgVb 

 now we can solve for the volume of lead: 

 ĎwgVl â’ ĎlgVl = ĎbgVb â’ ĎwgVb 

 Vl(Ďw â’ Ďl) = Vb(Ďb â’ Ďw) 

 Vl =   

 Ďbâ’Ďw 

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 Vb 

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 Vl =   

 600â’1000 

 1000â’11300 

 (0.6m Ă— 0.25m Ă— 0.08m) = 4.66 Ă— 10â’4m3
4 0
3 years ago
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