1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
harkovskaia [24]
3 years ago
8

Which description best defines blastocyst?

Physics
2 answers:
pentagon [3]3 years ago
6 0

Answer:

The correct option is C

Explanation:

A blastocyst consists of a mass of specialized cells (trophoblast), which is formed at the early stage during the development of the embryo. This means the embryo has not been formed yet (an embryo is formed when the amniotic sac develops).

An egg released from the ovary is wrong because it is a single cell (that has nothing to do with pregnancy on its own) while "A fertilized egg" is wrong because a fertilized egg consists of just two cells; a sperm cell and an egg cell".

lorasvet [3.4K]3 years ago
4 0
B an egg released from the ovary. It’s probably wrong
You might be interested in
A golf ball is given an initial velocity of 100 m/s at an angle of 22o with the horizontal. The golf ball lands on the roof of a
hoa [83]

a) 92.7 m/s, 37.5 m/s

The initial horizontal and vertical velocity are given by the equations:

u_x = u cos \theta\\u_y = u sin \theta

where

u = 100 m/s is the initial velocity of the ball

\theta=22^{\circ} is the angle of projection

So, the horizontal component of the initial velocity is

u_x = (100)(cos 22)=92.7 m/s

While the vertical component is

u_y = (100)(sin 22)=37.5 m/s

b) 3.83 s

The time at which the ball reaches the maximum height can be found by analyzing the vertical motion only.

In fact, the vertical velocity of the ball is given by

v_y = u_y +at

where

u_y = 37.5 m/s

a=g=-9.8 m/s^2 is the acceleration of gravity (in the downward direction)

t is the time

The ball reaches the maximum height when the vertical velocity becomes zero:

v_y = 0

So, solving for t, we find the time at which this happens:

t=-\frac{u_y}{g}=-\frac{37.5}{9.8}=3.83 s

c) 92.7 m/s

As stated in part b), the vertical velocity of the ball at the maximum height is zero:

v_y = 0

Along the horizontal direction, insteand, the motion of the ball is uniform, since there are no forces acting in this direction. Therefore, the horizontal velocity of the ball is constant (because the horizontal acceleration is zero), and it is

v_x = u_x = 92.7 m/s

And therefore, the velocity of the ball at the maximum height is simply equal to the horizontal  velocity:

v=92.7 m/s

d) 71.7 m

The maximum height of the ball can be found by studying again the vertical motion only, by using the following suvat equation:

s=u_yt+\frac{1}{2}at^2

where

s is the vertical displacement at time t

u_y = 37.5 m/s

a=g=-9.8 m/s^2

We know that the ball reaches the maximum height when t = 3.83 s, so we can find the vertical displacement at that time:

s=(37.5)(3.83)+\frac{1}{2}(-9.8)(3.83)^2=71.7 m

So, the maximum heigth is 71.7 m.

e) 5.93 s

We know that the ball lands on a building whose height is

h = 50 m

This means that when the ball lands, its vertical displacement is

s = 50 m

So, we can use again the equation

s=u_yt+\frac{1}{2}at^2

To find t, the time at which the ball lands. Substituting:

u_y = 37.5 m/s

a=g=-9.8 m/s^2

s = 50 m

The equation becomes

50=37.5 t -4.9 t^2\\4.9t^2 -37.5 t +50 = 0

which gives two solutions:

t = 1.72 s

t = 5.93 s

The first solution is the moment at which the ball reaches the height of h = 50 m for the first time (before reaching its maximum height), so we ignore it, and therefore the ball lands after

t = 5.93 s

8 0
3 years ago
3. What are the two parts of a shadow?
Zielflug [23.3K]

Answer:

the umbra and penumbra

Explanation:

The two parts of a shadow are the umbra and penumbra.

A shadow is an expression formed when light from a source is cut blocked by an opaque body.

Most shadows are made up of two parts, umbra and penumbra.

  • The umbra is the darkest, and the innermost part of a shadow.
  • In the penumbra, only a portion of the light source is blocked. It is more of like a partial shadow.

The umbra is directly formed by light which impinges on an opaque body and it completely cut off.

5 0
3 years ago
What is kinetic energy​
Debora [2.8K]

Answer:

Kinetic energy is the movement of objects based on their mass and motion

4 0
3 years ago
Read 2 more answers
A scientific model can be used to _______.
andrew11 [14]
The idea to have scientific models it is to be used in order to better understand systems and procesess. So the answer you are looking for is option B. Hope this is useful
3 0
3 years ago
Explain why the moon looks different almost every night?
timofeeve [1]

Because of the different cycles there are of the moon

There are 8 different phases of the moon

5 0
3 years ago
Read 2 more answers
Other questions:
  • This is the normal nucleotide sequence on a DNA strand: A-C-T-G-G-A-T what is a subtituction?
    5·2 answers
  • Precipitation clouds are observed at a distance of about 720 miles to the west of a city. The clouds are seen moving westwards a
    5·2 answers
  • Ed records the temperature of two pots of water. Pot X
    12·2 answers
  • When two magnets are brought close together their magnetic
    5·1 answer
  • A 1500 kg car travelling at 25 m/s collides with a 2500 kg van which had
    15·1 answer
  • How is the smell from a stinky diaper similar to the electric field produced by a charge
    5·1 answer
  • "What is the magnifying power of an astronomical telescope using a reflecting mirror whose radius of curvature is 5.9 m and an e
    15·1 answer
  • 3.A carnival ride has a radius of 5.00 m and exerts an applied force of 987 N on an 80 kg rider.
    7·1 answer
  • An acceleration constraint says that in some circumstances An acceleration constraint says that in some circumstances the accele
    9·1 answer
  • *NEED THIS ANSWERED ASAP*
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!