Which of these follows from Newton's laws about the energy of a moving object? A)The total mechanical energy of an object is always constant. B)The kinetic energy of an object remains the same if friction is absent. C)The mechanical energy remains the same if there are only conservative forces acting. D)The total of all forms of energy is always constant.

Answers

Answer 1

Answer: The correct answer for the question that is being presented above is this one: "C)The mechanical energy remains the same if there are only conservative forces acting." The statement that shows that Newton's laws about the energy of a moving object is that the mechanical energy remains the same if there are only conservative forces acting.

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When the engineer first sees the car, the locomotive is 100m from the crossing and its speed is 30m/s. If the engineer reaction time is 0.47 s what should the magnitude of the minimum deceleration to avoid an accident?

Answers

Answer:

The deceleration must have the engineer to avoid the accident is

a=-5.238 $(m)/(s^(2) )$

Explanation:

$x_(0)=100m\nv_(0)=30 (m)/(s) \nt=0.47 s$

While the engineer reacts the train continue moving so

$x_(f) = v*t= 30(m)/(s) *0.47s= 14.1 m$

$x_(t)= x_(o)+x_(f)\nx_(t)= 100m-14.1m=85.9m$

Now the final velocity have to be zero so using equation can find deceleration

$V_(f) ^(2) =V_(o) ^(2)+2*a*x_(f)\n 0= V_(o) ^(2)+2*a*x_(f)\na=-(V_(o) )/(2*x_(f))\na=-((30(m)/(s)) ^(2) )/(2*85.9m) \na=-5.238 (m )/(s^(2) ) } \n$

After tasting the salt in the ocean water on a visit to the beach one day, you recall from class that the salt is the __________ in the ocean water. A. solid
B. solute
C. solution
D. solvent

Answers

Solid is a stateof matter having no space in a volume, made entirely of compact material.
Solute is adissolved substance is a dissolved substance in a solution.Solution is theone that dissolves the solute.
Solvent is theone that dissolves either a solution or solute.
Based on thedefinitions, the answer is letter B. solute.

Answer:

B. Solute

Explanation:

I've taken this on USATestPrep

Why do electromagnetic waves not require a medium for travel?A) because electromagnetic waves travel too fast for stationary particles to move with them
B) because electromagnetic waves transmit energy without compressing the particles of the medium
C) because electromagnetic waves generate their own particles for compression and use these for movement
D) because electromagnetic waves move in two-dimensional space, the particles of mediums exist in 3-D space

Answers

The answer is B) because electromagnetic waves transmit energy without compressing the particles of the medium. Electromagnetic waves are not like mechanical waves (ex. sound waves) because they do not need a medium to propagate. Electromagnetic waves continuously propagates as electric fields and magnetic fields generate each other.

Answer:

B) because electromagnetic waves transmit energy without compressing the particles of the medium

Explanation:

Electromagnetic waves are the combination of electric and magnetic field which will oscillate perpendicular to each other. And the propagation of wave here is perpendicular to both electric and magnetic field.

So here in this type of wave propagation we do not require any medium as this is propagation of electric and magnetic field.

So here no need of compression or rarefaction of medium molecules and hence it do not need any medium to travel

so here correct answer is

B) because electromagnetic waves transmit energy without compressing the particles of the medium

Why does a vibraing simple pendulum not produce any sound

Answers

Human ear can hear the lowest frequency about 20 Hz, this is 20 vibrations per second. Vibrations of pendulum are very small and frequency is less than 20 Hz, so we can't hear it.

It does, but the sound is at a frequency that's too low for you to hear.
If you could build a pendulum short enough so that it made 20 or more
complete swings every second, THEN you'd begin to hear sound from it.

The atmosphere and oceans are in constant motion. This is because _____.

Answers

The Sun's heat is spread unevenly on Earth, and the atmosphere and oceans circulate and redistribute heat.

of the earths rotation around both it's axis and the sun

In february a little town received snow on a daily basis. The first day they had 10 inches, 3 inches the second, 7 inches the 3rd, and 4 inches on the fourth day. What was the average snowfall?

Answers

The average snowfall of the four days was 6 inches.

What is snow?

When atmospheric water vapor freeze into small ice crystals and falling in small white flakes or lying on the ground as a white layer, it is called snow.

In the question it is said that,

Amount of snow received by the town on first day = 10 inches.

Amount of snow received by the town on second day = 3 inches.

Amount of snow received by the town on third day = 7 inches.

Amount of snow received by the town on fourth day = 4 inches.

Total amount of snow received by the town on these four days = ( 10 + 3+ 7 + 4) inches.

=24 inches.

Hence, average amount of snow received by the town on these four days = total amount of snow received ÷ 4

= ( 24 ÷ 4) inches.

= 6 inches.

Hence, the average snow received by the little town was 6 inches on those days.

Learn more about snowfall here:

brainly.com/question/28294667

#SPJ2

Answer:

The average is 6

Explanation:

To find the average, you have to first add all the numbers. After you add all the numbers up, then you divide by how many numbers there are. This one had 4 numbers so you divide by 4

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