What would happen to the amount of matter on earth if mass were not conserved during changes of state?

Answers

Answer 1

Answer: earth would be thrown off its balance and nature would be in danger of too many resources and not enough resources

Answer 2

Answer: it would be very bad earth wouldve felled

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A 100 N force is applied to move a 15 kg object a horizontal distance of 5 meters at constant speed. * A 15 J B 150 J C 1500 J D 15000 J

Which of the following answers describe how to calculate the acceleration of an object? A. Divide the change in the objects velocity by the time it takes to make that change.
B. Divide the time the object travels by the distance it travels.
C. Calculate the distance the object travels and divide that by the time it takes to get there.
D. Calculate the velocity of an object and divide that by the time the object is in motion.

Answers

A. Divide the change in the objects velocity by the time it takes to make that change.

Explanation:

Acceleration is a vector quantity whose magnitude is given by the following equation:

$a=(\Delta v)/(\Delta t)$

where

$\Delta v$ is the change in velocity of the object

$\Delta t$ is the time it took to make the change in velocity

Therefore, we see that this equation corresponds to choice A.

I think it's A I hope this is right but I just studied this so I think this is the right answer

A hurricane in the Gulf of Mexico to 15 hours to travel 360 kilometers. What is the average speed of this hurricane in kilometers per hour?

Answers

Answer:

24 kph

Explanation:

360/15=24

Sound waves produced by a source pass a point five times every second. Which of the following choices correctly describes the period and frequency of these waves? The frequency is 1/5 Hz, and the period is 1/5 second.

The frequency is 1/5 second, and the period is 5 Hz.

The period is 1/5 second, and the frequency is 5 Hz.

The period is 5 s, and the frequency is 5 Hz.

Answers

The period is 1/5 second, and the frequency is 5 Hz.

Explanation:

Let's start by reviewing some definitions about waves:

- The period of a wave is the time taken for the wave to make one complete cycle. It is indicated with T and it is measured in seconds (s)

- The frequency of a wave is the number of complete cycles made by the wave in one second. It is indicated with f and it is measured in Hertz (Hz). It is equal to the reciprocal of the period:

$f=(1)/(T)$

where f is the frequency and T is the period.

In this problem, we have a wave that passes a given point five time per second. This means that the number of oscillations per second is five, and so its frequency is:

$f=(5 cycles)/(1 sec)=5 Hz$

It follows than the period of the wave is:

$T=(1)/(f)=(1)/(5)s$

Therefore, the correct statement is

The period is 1/5 second, and the frequency is 5 Hz.

Learn more about waves, frequency and period:

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Answer:

The period is 1/5 second, and the frequency is 5 Hz.

Explanation:

How long do CFC molecules remain active in the stratosphere?a. 10 to 50 years
b. 30 to 60 years
c. 60 to 120 years
d. 150 to 500 years

Answers

The CFC molecules remain intact and active long enough to make it into the stratosphere and can then stay active for up to a century!

A 75 kg baseball player runs at a velocity of 6 m/s before sliding to a stop at second base. a. What is the kinetic energy of the runner before he begins his slide? b. What is the kinetic energy of the runner once he reaches the base? c. What is the change in the kinetic energy of the runner? d. How much work is done by friction in stopping the runner? e. If the runner slides for 2 m, what is the force of friction that acts upon him?

Answers

Answer:

a. $\displaystyle k_o=1350\ J$

b. $\displaystyle k_1=0\ J$

c. $\Delta k=-1350\ J$

d. $W=-1350\ J$

e. $F=-675\ N$

Explanation:

Work and Kinetic Energy

When an object moves at a certain velocity v0 and changes it to v1, a change in its kinetic energy is achieved:

$\Delta k=k_1-k_0$

Knowing that

$\displaystyle k=(mv^2)/(2)$

We have

$\displaystyle \Delta k=(mv_1^2)/(2)-(mv_0^2)/(2)$

The work done by the force who caused the change of velocity (acceleration) is

$\displaystyle W=(mv_1^2)/(2)-(mv_0^2)/(2)$

If we know the distance x traveled by the object, the work can also be calculated by

$W=F.x$

Being F the force responsible for the change of velocity

The 75 kg baseball player has an initial velocity of 6 m/s, then he slides and stops

a. Before the slide, his initial kinetic energy is

$\displaystyle k_o=(mv_0^2)/(2)$

$\displaystyle k_o=((75)6^2)/(2)$

$\boxed{\displaystyle k_o=1350\ J}$

b. Once he reaches the base, the player is at rest, thus his final kinetic energy is

$\displaystyle k_1=((75)0^2)/(2)$

$\boxed{\displaystyle k_1=0\ J}$

c. The change of kinetic energy is

$\Delta k=k_1-k_0=0\ J-1350\ J$

$\boxed{\Delta k=-1350\ J}$

d. The work done by friction to stop the player is

$W=\Delta k=k_1-k_0$

$\boxed{W=-1350\ J}$

e. We compute the force of friction by using

$W=F.x$

and solving for x

$\displaystyle F=(W)/(x)$

$\displaystyle F=(-1350\ J)/(2\ m)$

$\boxed{F=-675\ N}$

The negative sign indicates the force is against movement

A distance between two consecutive troughs in a wave motion train produced in a string is 5 cm. Find speed of wave , if two complete waves pass through any point per second

Answers

Speed= (frequency) x (wavelength)

= (2 per second) x (5 cm) = 10 cm/sec .

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