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3 years ago

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Which statement is true about vectors? a. All quantities in physics are not vectors. b. A vector may have either magnitude or di

rection. c. The vector's length should be proportional to its magnitude. d. Two vectors can be added only if they have the same direction.

1 answer:

dlinn [17]3 years ago

8 0

Yeah yeah ok yeah I saw

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Monochromatic light of wavelength 720 nm is incident on parallel slits, of width 0.420 mm, separated by 0.560 mm. A diffraction

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1.81×10^-4Io

Explanation:

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The equation for photosynthesis is 6H2O (water) + 6CO2 (carbon dioxide) + Light Energy → C6H12O6 (glucose) + 6O2 (oxygen). When

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3 years ago

A block of aluminum with a weight of 10 N is placed in a beaker of water filled to the brim. Water overflows. The same is done i

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Answer:

No

Explanation:

Given that

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Weight of the aluminium lead = 10 N

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The density of lead ,ρ=11343 kg/m³

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3 years ago

A wave travels at a constant speed. How does the wavelength change if the frequency is reduced by a factor of 4?

Svetlanka [38]

Answer:

The product of (wavelength) x (frequency) is always the same number ... the wave's speed.

So if the wavelength is somehow reduced to 1/4 its original length, the frequency is immediately multiplied by 4 . That's the only way their product can remain the same.

Explanation:

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3 years ago

Suppose an elephant has a mass of 2800 kg. show answer No Attempt How fast, in meters per second, does the elephant need to move

Mumz [18]

Answer:

The speed of elephant must be 1.4 m/s.

Explanation:

Mass of the elephant, M = 2800 kg

Mass of sprinter, m = 77 kg

Speed of sprinter, v = 8.5 m/s

It is required to find the speed of elephant to have the same kinetic energy as that of sprinter. So,

$K_e=K_s\\\\\dfrac{1}{2}MV^2=\dfrac{1}{2}mv^2\\\\MV^2=mv^2\\\\V=\sqrt{\dfrac{mv^2}{M}} \\\\V=\sqrt{\dfrac{77\times 8.5^2}{2800}} \\\\V=1.40\ m/s$

So, the speed of elephant must be 1.4 m/s.

7 0

3 years ago