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GalinKa [24]
3 years ago
14

Plz answer brainliest if right!

Physics
1 answer:
AleksandrR [38]3 years ago
4 0

Answer: it is D. it is the only possible answer. use the process of elimination. which answers make sense?

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When does an object falling vertically through the air reach terminal velocity?
zlopas [31]

Answer:

a. when the acceleration of the objects become negative

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3 years ago
What's phase changes mean? I can't find it
MrRa [10]
The 'phases' are solid, liquid, gas. A change from any one of those to any other one is a phase change. Like melting ice, or evaporating sweat.
4 0
3 years ago
The sides of a square baseball diamond are 90 feet long. When a player who is between second and third base is 60 feet from seco
Sedbober [7]

Answer:

d(L)/dt  =  6,96 ft/s

Explanation:

We have a right triangle where the hypotenuse (L) is the distance between the player and home plate, the legs are the line between third base and home plate ( 90 feet ) and distance between the player and third base (x)  (over the line between second and third base). So we can write

L²  =  (90)²  +  x²

Applying differentiation in relation to time, on both sides of the equation we have:

2*LdL/dt  =  0  + 2*x d(x)/dt     (2)

In this equation we know:

d(x)/ dt  =  22 feet/sec

x = 30 ft

We need to calculate  L when the player is at 30 feet from third base

Then

L²  =  (90)² + (30)²

L²  =  8100 + 900

L  = √9000

L =94,87 feet

Then we are in condition for calculate  d(L)/dt from the equation

2*Ld(L)/dt  =  0  + 2*x d(x)/dt  

2*94,87 * d(L)/dt  =  2* 30* 22     ⇒  189,74 d(L)/dt = 1320

d(L)/dt  =  1320/ 189,74

d(L)/dt  =  6,96 ft/s

7 0
3 years ago
A particle of mass m is placed in a three-dimensional rect- angular box with edge lengths 2L, L, and L. Inside the box the poten
QveST [7]

Answer:

the energy of groud state = \frac{9h^{2} }{32ml^{2} }

Explanation:

the energy of a 3 dimensional rectangular box is given by \frac{h^{2} }{8m}  (\frac{n_{x} ^{2} }{l_{x} ^{2}  }  +\frac{n_{y}^{2}  }{l_{y} ^{2} }+ \frac{n_{z}^{2}  }{l_{z} ^{2} })

where h is planks constant m is the mass of the particle n_{x},n_{y} and n_{z} are principal quantum number in x y and z direction. and l_{x},l_{y} and l_{z} are length of box in x y and z direction.

therefore the energy of ground state will be when n_{x},n_{y} and n_{z} = 1

therefore energy of ground state = \frac{h^{2} }{8m}  (\frac{1 ^{2} }{2l ^{2}  }  +\frac{1^{2}  }{l^{2} }+ \frac{1^{2}  }{l ^{2} })

=\frac{9h^{2} }{32ml^{2} }

4 0
3 years ago
A technological device that can be used to see sound waves is an
Bond [772]
The answer is oscilloscope
4 0
3 years ago
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