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Mila [183]
3 years ago
12

A model rocket is shot directly upward, rises to its maximum height and then returns to its launch position in 10.0 s. Assuming

free fall conditions, what was the rocket's initial upward velocity?
a. 98.0 m/s
b. 123 m/s
c. 24.5 m/s
d. 49.0 m/s
Physics
1 answer:
worty [1.4K]3 years ago
3 0

d. 49.0 m/s

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A ball is dropped from the ceiling and free falls to the floor. Which one of the
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Answer:

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3 years ago
A high power line carries a current of 1.0 kA. What is the strength of the magnetic field this line produces at the ground, 10 m
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Answer:

The strength of the magnetic field that the line produces is 2x10^{-5} Tesla.

Explanation:

From Biot-Savart law, the equation to determine the strength of the magnetic field for any straight wire can be deduced:

           

B = \frac{\mu_{0}I}{2\pi r} (1)      

                                     

Where \mu_{0} is the permiability constant, I is the current and r is the distance from the wire.    

             

Notice that it is necessary to express the current, I, from kiloampere to ampere.

I = 1.0kA \cdot \frac{1000A}{1kA} ⇒ 1000A

Finally, equation 1 can be used:

B = \frac{(4\pi x10^{-7}T.m/A)(1000A)}{2\pi (10m)}    

           

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A sheet of metal is 2mm wide 10cm tall and 15cm long. it was 4g. what is the density? <br>​
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Explanation:

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t = 2 [mm] = 0.002 [m]

w = 10 [cm] = 0.1 [m]

Now we can find the volume.

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And the mass m = 4 [gramm] = 0.004 [kg]

Ro = 0.004/0.00003\\Ro = 133 [kg/m^{3}]

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Answer:

a) Osmolarity measures the moles of solute per liter of solution.

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