What is a natural form of pollution?

Which activity can substantially increase the activity level of a person's lifestyle? driving a car using an escalator washing d

VashaNatasha [74]

Walking to school, hope this helps!

5 0

3 years ago

Read 2 more answers

When more than one wave is in the same location at the same time, then there is _____ between the waves?

igor_vitrenko [27]

The sentence can be completed as follows:
"When more than one wave is in the same location at the same time, then there is interference between the waves"

In fact, when there are two or more waves in the same location at the same time, their amplitude sum together. The two extreme possibilities are:
- costructive interference: the two waves arrive on phase at the same location (=their crests arrive at the same location at the same time). In this case, the amplitudes of the waves sum together and the resultant wave has greater amplitude.
- destructive interference: the two waves arrive out of phase at the same location. In this case, the amplitudes of the two waves cancel out, and the resultant wave has amplitude zero.

4 0

3 years ago

On sunday a strong gale blows near beth’s house. the best estimate for the wind speed is ____ miles/hour.

Rufina [12.5K]

Answer:

B. 47-54 miles/hour

Explanation:

Gale is a strong wind which is depicted by red warning flag. According to U.S. National Weather Service gale is a sustained surface wind. It is also used to refer winds from tropical coastal areas.

On the basis of force of wind gale is divided in four groups:

Near gale - 32-38 mph
Gale - 39-46 mph
Strong gale - 47-54 mph
Storm - 55-63 mph

8 0

4 years ago

Two vectors of magnitudes 30 units and 70 units are added to each other. What are possible results of this addition? (section 3.

Ad libitum [116K]

Answer:

50 units

Explanation:

Given,

magnitude of the first vector = a = 30 units

magnitude of the second vector = 70 units

As we know, From the law of vector addition,

Resultant of the addition of the two vectors is,

$\therefor R\ =\ \sqrt{a^2\ +\ b^2\ +\ 2abcos\theta}$

where $\theta$ is the angle between the two vectors

And the value of $cos\theat$ lies between -1 ≤ $cos\theta$ ≥ 1.

For the possible values of the addition of the vectors

Therefore maximum possible value for the addition of the vector gives at the value of $cos\theta\ =\ 1$

$\therefore R_{max}\ =\ \sqrt{30^2\ +\ 70^2\ + 2\times 30\times 70\times 1}\\\Rightarrow R_{max}\ =\ 100 units$

Minimum possible value for the addition of the vectors gives at the value of $cos\theta\ =\ -1$

$\therefore R_{min}\ =\ \sqrt{30^2\ +\ 70^2\ + 2\times 30\times 70\times (-1)}\\\Rightarrow R_{min}\ =\ 40 units$

Hence the possible results of the addition of these two vectors is only 50 units which lies between the 40 units and 100 units.

8 0

4 years ago

The gravitational force between two objects is 45,000 N. What will be the gravitational force between the two objects if the dis

sweet [91]

The gravitational force would be 180,000 N if the distance is reduced by one- half.

According to Newton's law of gravitation, the force of attraction between two objects is proportional to the product of their masses and inversely proportional to the square of the distance between them.

Therefore, the force F between the two masses when they are at a distance d apart can be written as

$F \alpha\frac{1}{d^2}$ ........(1)