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3 years ago

Which statement best describes longitudinal waves?

2 answers:

8 0

Logitudinal waves are the waves which displacement of the medium is in the same direction as , or oppositemdirection to ,the direction of propagation of the wave.

jok3333 [9.3K]3 years ago

6 0

PLATO ANSWER: C. .... The only one that has the word parallel in it.

Have a great day!

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When starting a foot race, a 70.0kg sprinter exerts an average force of 650 N backward on the ground for 0.800 s. How far does h

melomori [17]

Answer:

Answer is option b) 2.97m

Explanation:

With the relationship between the force exerted by the runner and the mass that it has, I can determine the acceleration it will have:

F= m × a ⇒ a= (650 kg ×(m/s^2)) / (70kg)= 9.286 (m/s^2)

With the acceleration that prints the force exerted and the time I can determine the distance traveled in the interval:

Distance= (1/2) × a × t^2 = (1/2) × 9.286 (m/s^2) × ((0.8s)^2)= 2.97m

8 0

3 years ago

A car has a speed of 23 m/s and a momentum of 31,050 kg·m/s. What is the mass of the car?

Ilya [14]

Answer:

Mass = 1350kg

Explanation:

Given the following data;

Velocity = 23m/s

Momentum = 31,050 kg·m/s.

To find the mass of car;

Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.

Mathematically, momentum is given by the formula;

Momentum = mass * velocity

Substituting into the equation, we have

31,050 = mass*23

Mass = 31,050/23

Mass = 1350kg

Therefore, the mass of the car is 1350 kilograms.

3 0

3 years ago

Una persona tiene 45 años de edad y una masa de 78 kg. ¿Cuántas horas ha vivido? ¿Cuál

Pavel [41]

Answer:

I will answer this in English.

He has 45 years.

a year has 365 days.

a day has 24 hours.

So he has:

45*365*24 hours = 394,200 hours.

His mass is 78 kg,

And we know that 1 slug = 1lbf*ft/s^2

Then, the first step is transform the 78 kg into lbf.

1kg = 2.2 lbf.

then 78kg = 78*2.2 lbf = 171.6lbf.

Now, the weight is m*g, where m is the mass and g is the gravitational acceleration, in this case the gravitational acceleration in ft/s^2 is:

g = 32.2 ft/s^2

Then the weight in slugs is:

W = 32.2ft/s^2*171.6lbf = 5,525.5 slugs

8 0

3 years ago

Write a scientific question that is specific and testable. Jack and Jill when up a hill to fetch a pail of water. Once they got

Naya [18.7K]

The scientific method consists of making an observation, ask a question, formulate hypothesis, predict, test, iterate

The scientific question that can be asked is; What is the depth of the well

The reason why the above question is appropriate is as follows:

The items Jack and Jill found at the well

No pail

A stopwatch

Nine equal sized rocks

The information they can get using what they found are;

The time it takes the rock to reach the water surface in the well

The depth of the well

The well's depth, h, is given using the equation of free fall, as follows;

$h = \dfrac{1}{2} \cdot g \cdot t^2$

Where;

g ≈ Acceleration due to gravity ≈ 9.81 m/s²

By recording the time each rock takes to reach the water surface in the well, the average depth of the well, $h_{ave}$ , can be found by finding the average of the 9 calculated values for h using the 9 stones

Therefore;

The scientific question that is specific and testable is how deep is the well, or what is the well's depth

Learn more about scientific method here:

brainly.com/question/13096299

3 0

3 years ago

A 1.5m wire carries a 6 A current when a potential difference of 61 V is applied. What is the resistance of the wire?

Alisiya [41]

Resistance = (voltage) / (current)

For this piece of wire . . .

Resistance = (61 volts) / (6 Amperes)

Resistance = (61/6) (V/A)

Resistance = (10 and 1/6) ohms

Since you know the voltage and current, the length doesn't matter.

7 0

3 years ago