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3 years ago

Ozone, O3 methane, CH4 oxygen gas, O2 Are classified as

Physics

2 answers:

ratelena [41]3 years ago

7 0

They are all gasses at room temperature.

erma4kov [3.2K]3 years ago

5 0

I would think compounds.

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Henry, whose mass is 95 kg, stands on a bathroom scale in an elevator. The scale reads 830 N for the first 3.8 s after the eleva

Delicious77 [7]

Answer:

v= 4.0 m/s

Explanation:

When standing on the bathroom scale within the moving elevator, there are two forces acting on Henry's mass: Normal force and gravity.
Gravity is always downward, and normal force is perpendicular to the surface on which the mass is located (the bathroom scale), in upward direction.
Normal force, can adopt any value needed to match the acceleration of the mass, according to Newton's 2nd Law.
Gravity (which we call weight near the Earth's surface) can be calculated as follows:

$F_{g} = m*g = 95 kg * 9.8 m/s2 = 930 N (1)$

According to Newton's 2nd Law, it must be met the following condition:

$F_{net} = F_{g} -F_{n} = m*a\\ F_{net} = 930 N - 830 N = 100 N = 95 Kg * a$

As the gravity is larger than normal force, this means that the acceleration is downward, so, we choose this direction as the positive.

Solving for a, we get:

$a =\frac{F_{net} }{m} =\frac{100 N}{95 kg} = 1.05 m/s2$

We can find the speed after the first 3.8 s (assuming a is constant), applying the definition of acceleration as the rate of change of velocity:

$v_{f} = a* t = 1.05 m/s * 3.8 m/s = 4.0 m/s$

Now, if during the next 3.8 s, normal force is 930 N (same as the weight), this means that both forces are equal each other, so net force is 0.
According to Newton's 2nd Law, if net force is 0, the object is either or at rest, or moving at a constant speed.
As the elevator was moving, the only choice is that it is moving at a constant speed, the same that it had when the scale was read for the first time, i.e., 4 m/s downward.

3 0

3 years ago

The law of conservation of matter states that matter can neither be created nor destroyed. How is the law of conservation of mat

FromTheMoon [43]

<span>The law of conservation of matter and energy relates to the cycles in nature, and by that it is also applied to rocks and other materials. All of the rock in the Earth is recycled and accounted for during the rock cycle. Rocks experience physical change, the composition of the material stays the same, it may just change how it looks and chemical changes occur (the suubstance undergoes a chemical reaction that changes the actual makeup of the substance).</span>

4 0

3 years ago

How do you determine how much kinetic energy an object has

Ierofanga [76]

I believe the answer is a. Because the formula of kinetic energy is 1/2(m)•(v^2)

3 0

2 years ago

Read 2 more answers

Work out

Simora [160]

the father has to sit 0.5meter away from the kid because he is a 3/4 heavier that the kid

6 0

2 years ago

Situation 6.1 A 13.5-kg box slides over a rough patch 1.75 m long on a horizontal floor. Just before entering the rough patch, t

GenaCL600 [577]

B) 14.0 N

The way to solve this problem is to determine the kinetic energy the box had before and after the rough patch of floor. The equation for kinetic energy is:

E = 0.5 M V^2

where

E = Energy

M = Mass

V = velocity

Substituting the known values, let's calculate the before and after energy.

Before:

E = 0.5 M V^2

E = 0.5 13.5kg (2.25 m/s)^2

E = 6.75 kg 5.0625 m^2/s^2

E = 34.17188 kg*m^2/s^2 = 34.17188 joules

After:

E = 0.5 M V^2

E = 0.5 13.5kg (1.2 m/s)^2

E = 6.75 kg 1.44 m^2/s^2

E = 9.72 kg*m^2/s^2 = 9.72 Joules

So the box lost 34.17188 J - 9.72 J = 24.451875 J of energy over a distance of 1.75 meters. Let's calculate the loss per meter by dividing the loss by the distance.

24.451875 J / 1.75 m = 13.9725 J/m = 13.9725 N

Rounding to 1 decimal place gives 14.0 N which matches option "B".

8 0

3 years ago