What occurs when the moons shadow falls on the earth's surface

Answers

Answer 1

Answer: the term for this is "solar eclipse" and it's when the moon comes between the sun and earth casting a shadow over earth.

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Which is the best example of the concept of heredity? A. A black cat blends into its environment at night. B. A baby has his mother's hair and eye color. C. As a barnacle grows, it gets calcium for its shell from seawater. D. The sunflower will move so its flower head is always facing the sun.

Answers

B) A baby has his mother's hair and eye color

B. A baby has it's mother's hair and eye color

The reason for this is, well, heredity is the passing of traits from parents to offspring. So, a black cat blending into it's environment at night simply does not have much to do with heredity. But a baby inheriting it's mother's eye color and hair color is definitely heredity, for it was inherited.

Hope this helped!!

The air is soundproof??

Answers

Not possible. The air is actually able to travel sound throughout itself without any difficulties. I believe, air actually brings sound closer to the people farther away ; It really helps to stretch sound.

Air isnt soundproof, actually places that have no air (like outer space) aka vaccum are soundproof .

A block of mass m1=3.7kg on a smooth inclined plane of angle 30 is connected by a cord over a small frictionless pulley to a second block of mass m2=2.3kg hanging vertically. Calculate the acceleration of each block

Answers

consider the forces on mass m₁ on the incline plane :

parallel to incline , force equation is given as

T - m₁ g Sin30 = m₁ a

T = m₁ g Sin30 + m₁ a eq-1

consider the force on mass m₂ on the incline plane :

m₂ g - T = m₂ a

T = m₂ g - m₂ a eq-2

Using eq-1 and eq-2

m₂ g - m₂ a = m₁ g Sin30 + m₁ a

inserting the values

(2.3 x 9.8) - 2.3 a = (3.7 x 9.8) Sin30 + 3.7 a

a = 0.74 m/s²

A skateboarder traveling at 4.45 m/s can be stopped by a strong force in 1.82 s and by a weak force in 5.34 s.The mass of the skateboarder and the skateboard is 53.6 kg.

What is the impulse on the skateboarder?
What is the average force on the skateboarder in each of these stops?

Answers

1) Impulse: $-238.5 kg m/s$

2) Strong force: -131.1 N, weak force: -44.7 N

Explanation:

The impulse exerted on an object is equal to the change in momentum of the object itself.

Mathematically:

$I=\Delta p=m(v-u)$

where

m is the mass of the object

u is the initial velocity

v is the final velocity

For the skateboarder in this problem, we have:

m = 53.6 kg

u = 4.45 m/s

v = 0 (it comes to a stop)

Therefore, the impulse is

$I=(53.6)(0-4.45)=-238.5 kg m/s$

Where the negative sign indicates that the direction is opposite to the motion of the object.

The impulse is also equal to the product between the force applied and the duration of the collision:

$I=F\Delta t$

where

I is the impulse

F is the average force

$\Delta t$ is the time during which the force is applied

The strong force is applied in a time of

$\Delta t = 1.82 s$

Therefore this force is

$F=(I)/(\Delta t)=(-238.5)/(1.82)=-131.1 N$

The weak force is applied in a time of

$\Delta t = 5.34 s$

So this force is

$F=(I)/(\Delta t)=(-238.5)/(5.34)=-44.7 N$

Learn more about impulse:

brainly.com/question/9484203

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if a car that is 100 feet in front of you on route 70 west slams on the brakes while you are traveling 65 miles per hour (95 feet per second) how much time do you have to hit the brakes and stop before rear ending them