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Valentin [98]
3 years ago
6

All chordates are vertebrates? A. True B. False

Physics
2 answers:
tatyana61 [14]3 years ago
8 0
All vertebrates<span> are </span>chordates<span> but </span>all chordates are not vertebrates.....So its false...an example is a lancelet...Please mark me brainliest

makvit [3.9K]3 years ago
3 0
This is true chordates are vertebrae
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If the briefcase hits the water 6.0 s later, what was the speed at which the helicopter was ascending?
vovikov84 [41]

Complete Question

In an action movie, the villain is rescued from the ocean by grabbing onto the ladder hanging from a helicopter. He is so intent on gripping the ladder that he lets go of his briefcase of counterfeit money when he is 130 m above the water. If the briefcase hits the water 6.0 s later, what was the speed at which the helicopter was ascending?

Answer:

The speed of the helicopter is u  =  7.73 \  m/s

Explanation:

From the question we are told that

   The height at which he let go of the brief case is  h =  130 m  

    The  time taken before the the brief case hits the water is  t =  6 s

Generally the initial speed of the  briefcase (Which also the speed of the helicopter )before the man let go of it is  mathematically evaluated using kinematic equation as

      s = h+  u t +  0.5 gt^2

Here s  is the distance covered by the bag at sea level which is zero

      0 = 130+  u * (6) +  0.5  *  (-9.8) * (6)^2

=>    0 = 130+  u * (6) +  0.5  *  (-9.8) * (6)^2

=>   u  =  \frac{-130 +  (0.5 * 9.8 *  6^2) }{6}

=>   u  =  7.73 \  m/s

     

7 0
3 years ago
Red light from three separate sources passes through a diffraction grating with 5.60×105 slits/m. The wavelengths of the three l
shtirl [24]

Answer:

I can help

Explanation:

6 0
3 years ago
A playground merry-go-round with a radius of 2.0 m and a rotational inertia of 100 kg m2 is rotating at 3.0 rad/s. A child with
vagabundo [1.1K]

Answer:

Explanation:

Conservation of angular momentum

The MGR originally has momentum

L = 100(3.0) = 300 kg•m²/s²

The child can be thought of as a point mass with I = mr²

When she jumps onto the rim of the MGR

300 = (100 + 22(2.0²)ω

ω = 300 / 188 = 1.5957... 1.6 rad/s

As she moves toward the center of the MGR, her moment of inertia goes to zero as her radius goes to zero.

The angular velocity when she reaches the center will again be 3.0 rad/s

8 0
3 years ago
A football coach walks 24 meters eastward, then 12 meters
elena-14-01-66 [18.8K]

Answer:

Distance magnitude = 24 meters

The direction of the displacement = Eastward

Explanation:

The distance walked by the football coach eastward = 24 meters

The distance walked by the football coach westward = 12 meters

Then the distance walked by the football coach eastward = 36 meters

Finally, the distance walked by the football coach westward = 22 meters

The total distance walked by the coach eastward  = 24 + 36 = 60 meters

The total distance walked by the coach westward  = 12 + 22 = 34 meters

Taking x-direction as positive, we have;

The magnitude of the distance = 60 - 34 = 24 meters,

The direction of the coach = Eastward.

4 0
3 years ago
When an oxygen atom forms an ion, it gains two electrons. What is the electrical charge of the oxygen ion?
Damm [24]
The oxygen atom, before it gains these two electrons, has a neutral charge, meaning that it has as many protons as electrons. After it gains 2 electrons, it has 2 more electrons than protons. Each electron has a charge of -1, so the whole molecule will  have a charge of -2. The correct answer is a)!
7 0
2 years ago
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