What is a medium and why do waves travel through them?

Answers

Answer 1

Answer: Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.

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You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s. The ball has—— energy.
A rope can withstand a tension of 12,000 N before it breaks. The weight of a car is 14,000 N. Discuss whether this rope could be strong enough to tow the car
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a 0.45 kg soccer ball changes its velocity by 20.0 m/s due to a force applied to it in 0.10 seconds. what force was necessary for this change in velocity?

Answers

Answer: 90N

Explanation:

Mass of ball = 0.45 kg

Change in velocity = 20.0 m/s

Time = 0.10 seconds

Force required for change = ?

Since force refers to the change in momentum per unit time, hence

Force = Momentum / Time

i.e Force = Mass x (change in velocity / time)

Force = 0.45kg x (20.0m/s /0.10second)

= 0.45kg x (200 m/s^2)

= 90N

Thus, 90N of force was necessary for this change in velocity

What type of sex chromosome will be contained by the sex cells of a female giraffe? A.
X chromosome only

B.
Y chromosome only

C.
X and Y chromosomes

D.
egg cells do not contain sex chromosomes
A pea plant is heterozygous for height (Tt). Which allele will be carried by a pollen grain produced by the plant?

A.
T only

B.
t only

C.
T and t

D.
T or t
Which term describes the example below?

A white cat has a mother that is homozygous dominant and a father that is homozygous recessive.

A.
homozygous dominant

B.
homozygous recessive

C.
heterozygous

D.
female

E.
male
Which term describes the example below?

A rabbit’s cells have two sex chromosomes that are different.

A.
homozygous dominant

B.
homozygous recessive

C.
heterozygous

D.
female

E.
male
Which term describes the example below?

A child with no freckles has a mother who has freckles and is heterozygous and a father who has no freckles and is homozygous recessive.

A.
homozygous dominant

B.
homozygous recessive

C.
heterozygous

D.
female

E.
male
Which term describes the example below?

A child with a widow’s peak has a mother who is homozygous dominant for a widow’s peak and a father who is homozygous dominant for a widow’s peak.

A.
homozygous dominant

B.
homozygous recessive

C.
heterozygous

D.
female

E.
male
Which term describes the example below?

A puppy’s cells have two sex chromosomes that are the same.

A.
homozygous dominant

B.
homozygous recessive

C.
heterozygous

D.
female

E.
male

Answers

1. X chromosome only

2. T or t

3. heterozygous

4. male

5. homozygous recessive

6. homozygous dominant

7. female

In 3-5 sentences, use your own words to explain how electricity gets from power plants to our homes.Use the "RAP" method to answer this question:

Restate the question
Answer the question
Prove your answer citing textual evidence from the course.
Don't forget to proofread your answer.

Answers

Answer:

so your wondering how electricity goes from power plants to your home? well, here's why.The electrical charge goes through high-voltage transmission lines that stretch across the country. It reaches a substation, where the voltage is lowered so it can be sent on smaller power lines. It travels through distribution lines to your neighborhood.

Electricity goes from power plants to our homes through a step-down transformer. This helps the voltage to be lowered because electricity has to have high amounts of voltage to travel. So once it’s been lowered, electricity gets transferred to smaller wires that connect to our outlets.

Reduce 2.525 liters ti microliters