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3 years ago

10

I need help with this

1 answer:

forsale [732]3 years ago

8 0

your lenght is the answer to your question

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Calculate the mass of air of density 1.2kgm-3 in a room of dimensions 8m by 6m by 4m.

77julia77 [94]

Answer:

230.4kg

Explanation:

volume of the room = l× b×h

volume= 8×6×4

volume=192m3

density= mass/volume

hence mass= density × volume

mass= 1.2kgm-3 × 192m3

mass= 230.4kg

5 0

2 years ago

What is a concave lens?

ozzi

A concave lens is a lens that has at least one of its surfaces or both surfaces curved inwards. Due to this reason, this lens diverges the light that falls on it and hence is also called a diverging lens. The concave lens is thinner in the middle compared to its edges. These are used in flashlights, binoculars, telescopes, etc.
Please see attached image for reference.

5 0

3 years ago

Excess radiation can cause cancer. true or false

RSB [31]

It would be true. Excess radiation causes cancer.

7 0

4 years ago

The rhinestones in costume jewelry are glass with index of refraction 1.50. To make them more reflective, they are often coated

anyanavicka [17]

Answer:

$T=62.9*10^{-9}$

Explanation:

From the question we are told that:

Index of refraction of Rinestones $\gamma_1 =1.5$

Index of refraction of silicon $\gamma_2 =2.0$

Wavelength $\lambda=576nm=576*10^{-9}$

Let each layer have thickness T

Therefore

Total Thickness =2T

Generally the equation for Constructive interference is mathematically given by

$2T=(m+0.5)\frac{l\lambda}{\gamma_2}$

Where

$M=0$

$2T=(0+0.5)\frac{576*10^{-9}}{2*2.0}$

$T=62.9*10^{-9}$

4 0

3 years ago

A stone is thrown horizontally at a speed of 10.0 m/s from the top of a cliff 139.4 m high.

Lesechka [4]

Answer:

a) 14.2sec

b) 1394m away if horizontal speed never changes

c) 9.8m/s

Explanation:

5 0

3 years ago