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3 years ago

12

Please help!!!!! I will mark brainliest

2 answers:

musickatia [10]3 years ago

8 0

Answer:12 brushing your teeth is sound energy that affects you its importent because it helps to understand how sound works

Explanation:

Dima020 [189]3 years ago

7 0

My favorite instrument is the trumpet . the sound waves it gives off basically bounces off the sides of the trumpet from the hair that you blow into it , and then the sound waves it other objects and come back to your ears

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Which of the following statements are true? Positively charged objects attract other positively charged objects. Negatively char

butalik [34]

The statement that is true is that positively charged objects attract negatively charged objects. This is due to a law that states 'like forces attract while unlike forces repel. This same concept applies to magnetism. If you put two similar poles together, for example; if you place two south poles together. You feel a separating force between the two poles. But if you place two opposite poles together they attract each other. Hope i helped. <span />

7 0

3 years ago

Read 2 more answers

You watch distant Sally Homemaker driving nails into a front porch at a regular rate of 1 stroke per second. You hear the sound

san4es73 [151]

Answer:

$d = 343 m$

Explanation:

As we know that the speed of sound in air is given as

$v = 343 m/s$

now the rate of strike is 1 stroke per second

so distance is given as

$d = v t$

now we will have

$t = 1 s$

$d = 343 \times 1$

so the distance is given as

$d = 343 m$

5 0

3 years ago

Suppose you have 20% of 20/100 or 1/5. Describe how you can solve the problem using 1/5 instead of 20%.

grin007 [14]

Answer:

To calculate Percent in fraction You need to do following steps.

Divide number by 100.

=20/100

=1/5

6 0

3 years ago

Read 2 more answers

Plz help I will mark brainiest help send answers

Elden [556K]

Answer:

D

Explanation:

3 0

3 years ago

A brick is dropped (zero initial speed) from the roof of a building. The brick strikes the ground in 1.90 s. You may ignore air

Gekata [30.6K]

Answer: Height of building = 17.69m, velocity of brick = 18.6m/s

Explanation: From the question, the body has a zero initial speed, thus initial velocity (u) all through the motion is zero.

By ignoring air resistance makes it a free fall motion thus making it to accelerate constantly with a value of $a = 9.8m/s^{2}$ .

Time taken to fall = 1.90s

a)

thus the height of the building is calculated using the formulae below

$H = ut + \frac{1}{2} gt^{2}$

but u = 0 , hence

$H = \frac{1}{2} gt^{2}$

$H = \frac{1}{2} *9.8* 1.9^{2} \\\\H = 17.69m$

b)

to get the value of velocity (v) as the brick hits the ground, we use the formulae below

$v^{2} = u^{2} + 2aH$

but u= 0, hence

$v^{2} = 2gH\\$

$v^{2} = 2 * 9.8 * 17.69\\v = \sqrt{2 *9.8* 17.69} \\v = 18.62m/s$

find the attachment in this answer for the accleration- time graph, velocity- time graph and distance time graph

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4 years ago