A bookcase has a base of 1 m long and 0.5 m wide. It has a mass of 300kg. Find the pressure it exerts on the floor in kPa.

Answers

Answer 1

Answer: $1m*0.5m=0.5m^2\n g=10(m)/(s^2)\n 300kg*10(m)/(s^2)=3000N\n 3000N--0.5m^2\n \ \ x\ \ --\ 1\n x=6000Pa=60kPa$

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In what way does varying the length of a string of a violin change the vibration and how does this affect the sound that's produced?

Answers

The wavelength is the so-called "fundamental" wavelength, or the "first mode." Thus, the wavelength of the string's vibration is defined by the supports, and has nothing whatsoever to do with mass or elasticity.

Each element is made up of only one kind of_________

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Each element is made up of only one kind of atom.
Each element has their own atom.

each element is made up of one kind of ATOM

Explain how mirrors can produce images that are larger or smaller than life size, as well as upright or inverted

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Answer:

1) When $d_(o)$ < $d_(i)$ (hence $d_(o)$ < f ) and they are both in front of the mirror (positive), the image will be larger and inverted

2) When $d_(o)$ > $d_(i)$ (and $d_(o)$ < f ) such that they are both positive (in front of the mirror), the image will be smaller and inverted

3) When the image is behind the mirror, for convex mirrors and the object is in front the image will be uptight. The magnification of the image will be the ratio of the image distance to the object distance from the mirror

Explanation:

The position of an object in front of a concave mirror of radius of curvature, R, determines the size and orientation of the image of the object as illustrated in the mirror equation

$(1)/(f)=(1)/(d_(o)) + (1)/(d_(i))$

$Magnification, \, m = (h_(i))/(h_(o)) = -(d_(i))/(d_(o))$

Where:

f = Focal length of the mirror = R/2

$d_(i)$ = Image distance from the mirror

$d_(o)$ = Object distance from the mirror

$h_(i)$ = Image height

$h_(o)$ = Object height

$d_(o)$ is positive for an object placed in front of the mirror and negative for an object placed behind the mirror

$d_(i)$ is positive for an image formed in front of the mirror and negative for an image formed behind the mirror

m is positive when the orientation of the image and the object is the same

m is negative when the orientation of the image and the object is inverted

f and R are positive in the situation where the center of curvature is located in front of the mirror (concave mirrors) and f and R are negative in the situation where the center of curvature is located behind the mirror (convex mirrors)

∴ When $d_(o)$ < $d_(i)$ (hence $d_(o)$ < f ) and they are both in front of the mirror (positive), the image will be larger and inverted

When $d_(o)$ > $d_(i)$ (and $d_(o)$ < f ) such that they are both positive (in front of the mirror), the image will be smaller and inverted

When the image is behind the mirror, for convex mirrors and the object is in front the image will be uptight. The magnification of the image will be the ratio of the image distance to the object distance from the mirror.

Which describes the experiment of becquerel and the curies

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The correct answer is D. Becquerel showed that uranium gave off radioactivity, and the Curies discovered other radioactive elements.

How do whales bats and dolphins use echolocation?A To scare away predators
B To attract mates
C To orient them selves and find food
D To tell animals of there species where they are

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C is your answer ithink

I think ur answer is c

How do u know if a wave is a mechanical wave?

Answers

Basically, "mechanical wave" means that the wave involves actual movement

the wave is created by like a boat or something like that

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