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3 years ago

Hi, I need help with 2 science questions... 20 points and brainliest... please help me!!!!

1 answer:

6 0

1. The fields of science and mathematics are so interdependent because:
Scientists need to be able to take careful measurements.
Scientists need to be able to make precise measurements.
2. The following questions can use science as a method of inquiry:
How can we protect crops from drought?
Did dinosaurs exist?

P.S. No probs man, I will answer the same question over and over again, as long as you are willing to give away so many points. (Would be a real shame if I'm wrong, tho, but let's hope for the best :))

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Can You Explain?

alina1380 [7]

Answer:

Explanation:

The radial velocity method involves watching the spectral lines of a star as a planet orbits the star. Because of the planets gravitational pull on the star, the star will wobble. This causes Doppler shifts in the spectral lines, allowing astronomers to infer the presence of the planets.

3 0

3 years ago

Students launch a steel ball horizontally from a tabletop. The initial horizontal speed of the ball is v, the tabletop height ab

Nadya [2.5K]

Answer:

5.9 m

Explanation:

v=6m/s

H=5m

h=0.17m

g=10 m/s

First we find the time in which ball reaches the entrance of coffee can. For this purpose the ball has to travel a distance S vertically downward such that

S= 5-0.17 = 4.83 m

While falling down Vi =0

g= 10 m/sec2

t = ?

S=vit+1/2 gt2

==> 4.83=0+0.5×10× $t^{2}$

==> 4.83=5× $t^{2}$

==> $t^{2}$ =4.83/5 = 0.97

==> t= 0.98 sec

So in this time the ball reaches the coffee can height level. Now let's calculate horizontal distance covered by the ball in this time.

Horizontal distance = horizantal velocity × time

= 6 × 0.98 = 5.9 m

6 0

3 years ago

What is the difference in mass between the smaller nuclei that fuse together and the newly formed heavier nucleus called?

baherus [9]

Answer:

ESTA!!!

Explanation:

3 0

3 years ago

If the impulse acting on an object is 100n waht is force acting on it if the time 1 s

lutik1710 [3]

force = 100 N

Impulse ( N.s ) : Force ( N ) * Time ( s )

⇒ 100 N.s = force * 1 s

⇒ force = 100/1

⇒ force = 100 N

8 0

3 years ago

A beam of light in air is incident at an angle of 30º to the surface of a rectangular block of clear plastic (n = 1.46). The lig

Aneli [31]

Answer:

θ = 30°

Explanation:

Firts, the angle when the beam of light passes through the block cam be calculated using Snell Law:

$n_{1}sin(\theta_{1}) = n_{2}sin(\theeta_{2})$

Where:

n₁: is the index of refraction of the incident medium (air) = 1

θ₁: is the incident angle = 30°

n₂: is the medium 2 (plastic) = 1.46

θ₂: is the transmission angle

Hence, θ₂ is:

$sin(\theta_{2}) = \frac{n_{1}*sin(\theta_{1})}{n_{2}} = \frac{1*sin(30)}{1.46} = 0.34 \rightarrow \theta_{2} = 20.03 ^{\circ}$

Now, when the beam of light re-emerges from the opposite side, we have:

n₁: is the index of refraction of the incident medium (plastic) = 1.46

θ₁: is the incident angle = 20.03°

n₂: is the medium 2 (air) = 1

θ₂: is the transmission angle

Hence, the angle to the normal to that surface (θ₂) is:

$sin(\theta_{2}) = \frac{n_{1}*sin(\theta_{1})}{n_{2}} = \frac{1.46*sin(20.03)}{1} = 0.50 \rightarrow \theta_{2} = 30 ^{\circ}$

Therefore, we have that the beam of light will come out at the same angle of when it went in, since, it goes from air and enters to a plastic medium and then enters again in this medium to go out to air again. This was proved using the Snell Law.

I hope it helps you!

5 0

3 years ago