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natka813 [3]
3 years ago
14

Please help me and show work, will mark Brainliest!!

Physics
1 answer:
Licemer1 [7]3 years ago
3 0

Speed is distance over time, learn that formula and look at the image

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Example 4.4
Dmitry [639]

Answer:

  • 0.0002012
  • 0.0002192

Explanation:

Using apparent = mass of liquid expelled/mass of liquid remaining × temp. rise

Mass expelled: 250-248.5=1.5g

Mass remaining =248.5g

Temp. rise= 60-30= 30ºc

= 1.5/248.5×30=0.0002012

Using real= apparent + cubic expansivty

Cubic= 3 × linear expansivty

= 3×0.000006=0.000018

0.0002012+0.000018=0.0002192

3 0
2 years ago
A small rock is thrown vertically upward with a speed of 17.0m/s from the edge of the roof of a 26.0m tall building. The rock do
Pachacha [2.7K]

Answer:

A) v = 28.3 m/s

B) t =  4.64 s

Explanation:

A)

  • Assuming no other forces acting on the rock, since the accelerarion due to gravity close to the surface to the Earth can be taken as constant, we can use one of the kinematic equations in order to get first the maximum height (over the roof level) that the ball reaches:

        v_{f}^{2} - v_{o}^{2} = 2* g* \Delta h  (1)

  • Taking into account that at this point, the speed of the rock is just zero, this means vf=0 in (1), so replacing by the givens and solving for Δh, we get:

       \Delta h = \frac{-v_{o} ^{2}}{2*g} = \frac{-(17.0m/s)^{2} }{2*(-9.8m/s2)} = 14.8 m (2)

  • So, we can use now the same equation, taking into account that the initial speed is zero (when it starts falling from the maximum height) and that the total vertical displacement is the distance between the roof level and the ground (26.0 m) plus the maximum height that we have just found in (2) , 14.8m:
  • Δh = 26.0 m + 14. 8 m = 40.8 m (3)
  • Replacing now in (1), we can solve for vf, as follows:

       v_{f} =\sqrt{2*g*\Delta h} = \sqrt{2*9.8m/s2*40.8m} = 28.3 m/s (4)

B)

  • In order to find the total elapsed from when the rock is thrown until it hits the street, we can divide this time in two parts:
  • 1) Time elapsed from the the rock is thrown, until it reaches to its maximum height, when vf =0
  • 2) Time elapsed from this point until it hits the street, with vo=0.
  • For the first part, we can simply use the definition of acceleration (g in this case), making vf =0, as follows:

       v_{f} = v_{o} + a*\Delta t = v_{o} - g*\Delta t = 0 (5)

  • Replacing by the givens in (5) and solving for Δt, we get:

       \Delta t = \frac{v_{o}}{g} = \frac{17.0m/s}{9.8m/s2} = 1.74 s (6)

  • For the second part, since we know the total vertical displacement from (3), and that vo = 0 since it starts to fall, we can use the kinematic equation for displacement, as follows:

       \Delta h = \frac{1}{2} * g * t^{2}  (7)

  • Replacing by the givens and solving for t in (7), we get:

       t_{fall} =\sqrt{\frac{2*\Delta h}{g}} = \sqrt{\frac{2*40.8m}{9.8m/s2} } = 2.9 s (8)

  • So, total time is just the sum of (6) and (8):
  • t = 2.9 s + 1.74 s = 4.64 s
5 0
2 years ago
Does the apple scatter red light​
Mkey [24]

Answer: No

Explanation: colour of substance appears when molecules of apple

Absorb wavelengths of counter colour, also green light.

Counter colours are green-red, violet -yellow and blue-orange

6 0
2 years ago
Would young rocks be found near a volcano?
Vesna [10]

Answer:

Yes, young rocks typically occur around volcanoes since they are closer to the crate, thus the magma is beginning to cool down to form rocks or it has recently cooled down.

Explanation:

4 0
2 years ago
Read 2 more answers
A battery powers a circuit for a small noisy fan. The fan's motor gets warm as it turns. What energy transformations are
Pepsi [2]

Answer:

Chemical energy to electrical energy to mechanical and thermal energy

Explanation:

In the rotating fan, the chemical energy stored in the battery is used to generate electrical energy.

The electrolytes within the battery undergoes chemical reactions that produces electric current.

  • The current is being used to drive the motor of the fan to produce a mechanical energy as it rotates.
  • In like manner, heat energy is also produced.
  • So, energy is simply being transformed from one form to the other in this system.
3 0
2 years ago
Read 2 more answers
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