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3 years ago

8

Which statement is true about two isotopes of the same element? (1 point)

2 answers:

Ugo [173]3 years ago

6 0

They have a different number of neutrons. What defines what kind of element something is is how many protons it has. Hydrogen will always have 1 proton, because that's what makes it hydrogen. However, it is allowed to have different numbers of neutrons, like 0,1, or 2. They are all in the family of Hydrogen, but they are different isotopes of hydrogen. Hope this helps!

Natalija [7]3 years ago

5 0

They have different numbers of neutrons.

give them brainest already lol

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How does an inclined plane affect the effort needed to move a load vertically?

VashaNatasha [74]

If we pull an object vertically upwards then we need to apply a force which is equal in the magnitude of the weight of the object

$F = mg$

now when we pull the same object upwards along an inclined plane with angle then we require a force which will balance the component of weight along the inclined

so it is given as

$F' = mgsin\theta$

so as if we compare the two forces we can say that since the value of sine is always less than 1 for an angle less than 90 degree

so in the 2nd case when we pull the object along the inclined plane it will require less effort

so correct answer is

<em>A. reduce effort</em>

5 0

2 years ago

If a car travels 600m west in 25 seconds, what is its velocity?

Elena L [17]

$v = \frac{ \:the covered distance}{time} \\$

$v = \frac{600}{25} = \frac{6 \times 100}{25} = 6 \times 4 = 24 \: \\$

$v = 24 \: \frac{m}{s} \\$

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If west means the west of the axis x the velocity equal :

$- 24 \: \frac{m}{s} \\$

4 0

3 years ago

The purpose of the control group is to

pogonyaev

Have everything in control and in order and discuss about different issues.

5 0

3 years ago

Read 2 more answers

A longitudinal wave is shown.<br> Which label identifies a rarefaction?

aev [14]

Answer:

B.

Explanation:

9 0

3 years ago

A meter stick is held vertically above your hand, with the lower end between your thumb and first finger. On seeing the meter st

inessss [21]

Answer:

$t=0.193s$

Explanation:

What is said is that the meter fell d=18.3cm=0.183m under the action of gravity. We can use the formula for accelerated motion:

$d=v_0t+\frac{at^2}{2}$

Since it departed from rest it will mean that:

$d=\frac{at^2}{2}$

So our time will be:

$t=\sqrt{\frac{2d}{a}}$

Which for our values is:

$t=\sqrt{\frac{2(0.183m)}{(9.81m/s^2)}}=0.193s$

7 0

3 years ago