4 years ago

The phases of the moon occur because the moon revolves around the earth. True False

1 answer:

7 0

Answer: True

Explanation:
The phases occur because the sun lights different parts of the moon as the moon revolves around the earth

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A group of runners complete a 26.2 mile marathon in 3.4 hours. The distance between the start and finish lines is 12.2 miles. Wh

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26.2/3.4 would be the average velocity for the run.

7.7 miles/hr

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3 years ago

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The wavelengths of radio waves are much _______________ than the wavelength of microwaves. therefore, radio waves carry much ___

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The wavelengths of radio waves are much "Longer" than the wavelength of microwaves therefore, radio waves carry much "Lower" <span>energy than a microwave.

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3 years ago

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A converging lens can produce both real and virtual images depending on the position of the object. Explain when converging lens

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Answer: C

Explanation:

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A 19kg block is being pulled with a constant horizontal force of 95 Newton’s while also experiencing a constant friction force o

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Answer:

⋅(19kg)=19Akg

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3 years ago

A spherical weather balloon is filled with hydrogen until its radius is 4.40 m. Its total mass including the instruments it carr

ipn [44]

Answer:

4515.49484 N

4329.10484 N

Explanation:

r = Radius of balloon = 4.4 m

m = Mass of balloon with instruments = 19 kg

g = Acceleration due to gravity = 9.81 m/s²

Volume of balloon

$v=\frac{4}{3}\pi r^3\\\Rightarrow v=\frac{4}{3}\pi 4.4^3\\\Rightarrow v=356.8179\ m^3$

The Buoyant force = Weight of the air displaced

$F=\rho vg\\\Rightarrow F=1.29\times 356.8179\times 9.81\\\Rightarrow F=4515.49484\ N$

The buoyant force acting on the balloon is 4515.49484 N

Net force on the balloon

$F_n=F-W\\\Rightarrow F_n=4515.49484-19\times 9.81\\\Rightarrow F_n=4329.10484\ N$

The net force on the balloon is given by 4329.10484 N

As the balloon goes up the pressure outside reduces as the density of air decreases while the air pressure inside the balloon is high hence, the radius of the balloon tend to increase as it rises to higher altitude.

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3 years ago