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3 years ago

Please helppp me with science

Physics

1 answer:

Olenka [21]3 years ago

4 0

H's result was one dead flower ... not surprising ... stuck in a dark room = no photosynthesis = no growth = death.
H loses is "control" part of his "experiment".
Q gives no idea the colour of H's flowers in expt.
H "shows" that a watered plant in sunlight with a bit of fetilizer tends to grow. He could have had a look outside at a garden to see that.

improvement by not killing the "control" plant. put it side by side with the test plant, so both get the photo stuff. Then measured fertilizer in test plant, and same water minus fert in control.

As for the colour I've no idea.

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A sled is pushed to right with a force of 200 N. The force of friction opposing that motion is 50 N. a) What is the Net Force on

marin [14]

Answer:

Fr = 150 [N]

a = 5 [m/s²]

Explanation:

In order to find the resulting force, we must assume that the thrust force is positive to the right, while the friction force is negative to the left.

$F_{r}=200-50\\F_{r}=150[N]$

Now Newton's Second Law tells us that the sum of the forces or the resulting force is equal to the product of mass by acceleration.

F = m*a

$150 = 30*a\\a=150/30\\a = 5 [m/s^{2} ]$

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3 years ago

the plane of a 5.0 cm by 8.0 cm rectangular loop wire is parallel to a 0.19 t magnetic field. if the loop carries a current of 6

bekas [8.4K]

Here is the state ment :0.2 loop

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3 years ago

In a double-slit interference experiment, which of the following actions (perhaps more than one) would cause the fringe spacing

frozen [14]

Answer:

The correct option is a , c

Explanation:

Generally the fringe spacing is mathematically defined as

$y = \frac{m \lambda D}{d}$

Where y is the fringe spacing

m is the order of the fringe

$\lambda$ is the wavelength

D is the distance between the slit and the screen

d is the distance between the slit

Now in order to increase the fringe spacing can do the following

Increase the wavelength
increase the distance from the slit to the screen
Decrease the distance between the slit

The following action would increase the fringe spacing because the from the question these parameters are directly proportional to the fringe spacing

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3 years ago

Which illustration represents the arrangement of particles in a gas?

Romashka [77]

Answer: the answer is c

Explanation:

just did it on ap3x

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3 years ago

Glass absorbs ultraviolet (UV) rays from the Sun. Would a fraction of the incident UV light be reflected from the air/glass boun

fiasKO [112]

Answer:

Yes

Explanation:

Any transparent surface in practical is neither a perfect absorber of electromagnetic waves neither a perfect reflector. Generally all the transparent surfaces reflect some amount of irradiation and the other parts are absorbed and transmitted.

<u>That is given by as relation:</u>

$\alpha+\rho+\tau=1$

where:

$\alpha=$ absorptivity which is defined as the ratio of the absorbed radiation to the total irradiation

$\rho=$ reflectivity is defined as the ratio of reflected radiation to the total irradiation

$\tau=$ transmittivity is defined as the ratio of total transmitted radiation to the total irradiation

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4 years ago