3 years ago

Which of the following is an example of a physical change? burning paper digesting food o ripping paper

1 answer:

4 0

Ripping paper, because you are changing the physical appearance. The other answer choices are an example of chemical change.

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A motorboat is moving at 4.0 m/s when it begins to accelerate at 1.0 m/s2. To the nearest tenth of a second, how long does it ta

vaieri [72.5K]

Answer:

13 sec

Explanation:

Hello

by definition the acceleration is a vector derived magnitude that indicates the speed variation per unit of time

$a=\frac{V_{f}-V_{i}}{t_{f}-t_{i}}\\a(t_{f}-t_{i})={V_{f}-V_{i} }}\\t_{f}-t_{i}=\frac{V_{f}-V_{i}}{a} \\\\t_{f}=\frac{V_{f}-V_{i}}{a}+t_{i} \\\\$

Let

Vi=4.0 m/s

a=1.0 m/s2

Vf=17.0 m/s

ti= (0)sec

t2= unknown

$t_{f}=\frac{V_{f}-V_{i} }{a}+t_{i}\\t_{f}=\frac{17-4 }{1}+0\\t_{f}=\ 13\ sec\\$

Answer: 13 sec

I hope it helps

8 0

3 years ago

Mercury is 0.39 AU from the sun what is its distance from the sun in kilometers

lutik1710 [3]

58,000 --------------------------------------------------------------

3 0

3 years ago

Read 2 more answers

200 mL of an ideal gas is placed in a piston and is held at a pressure of 500 torr. If the temperature is held constant and the

galina1969 [7]

Answer:

V₂=153.84 m L

Explanation:

Given that

Initial volume ,V₁ = 200 m L

Initial pressure ,P₁= 500 torr

Final pressure P₂ = 650 torr

Lets take the final volume =V₂

Given that process occurs at constant temperature and we know that for constant temperature process

P₁ V₁ = P₂ V₂

$V_2=\dfrac{P_1V_1}{P_2}$

Now by putting the values

$V_2=\dfrac{500\times 200}{650}\ mL$

V₂=153.84 m L

Therefore the new volume of the gas will be 153.8 4mL.

7 0

3 years ago

A point source emits electromagnetic energy at a rate of 100 W. The intensity 10 m from the source is

MariettaO [177]

Answer:

$I=0.0795\ W/m^2$

Explanation:

Given that,

Power of electromagnetic energy, P = 100 W

We need to find the intensity at a distance of 10 m from the source. Intensity is equal to the power per unit area. So,

$I=\dfrac{P}{4\pi r^2}\\\\I=\dfrac{100}{4\pi (10)^2}\\\\I=0.0795\ W/m^2$

So, the intensity at a distance of 10 m is $0.0795\ W/m^2$

5 0

3 years ago

If a person has a weight of 90N, what would the force of the floor reacting on this

Anna71 [15]

Answer:

90N

Explanation:

Assuming there are no other forces there would be an equal and opposite reaction of -90N. Assuming the question wants the magnitude of the force and not the vector it would be 90N

4 0

2 years ago

Which of the following is an example of a physical change? burning paper digesting food o ripping paper​

Which of the following is an example of a physical change? burning paper digesting food o ripping paper