In which situation is the acceleration of the car negative?

Answers

Answer 1

Answer: When a car is slowing down, it has a negative acceleration. Although it is not going a negative speed, it is decreasing in velocity, which is the definition of a negative acceleration.

Hope this helps!

Answer 2

Answer:
The car's acceleration is negative if ...

-- it's going slower and slower in the direction that you call 'positive',

OR . . .

-- it's going faster and faster in the direction opposite
to what you call 'positive',

OR . . .

-- it's driving around in a circle AND you call the direction
OUT from the center of the circle the 'positive' direction.

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If the speed of an object increases, it's kinetic energy does what?

Answers

Heloo,
Kinetic energy? WWhta is Kinetic Energy?
Kinetic energy is energy in motion....
So if an object is in motion (its going really fats , like a soccer ball being kicked for example right?) That soccer ball is being kicked and its in motion. When its speed increase what else is increasing? It's motion, correct?
So therefore, if an object is moving and its speed increase so does its Kinetic energy..

Bottom line is... The kinetic energy increases :)
Hope this helped!
~Queen Hanaenae

increases is the answer for sure

shelly starts from rest on her bicycle at the top of a hill. After 6.0s she has reached a final velocity of 14m/s. what is shellys acceleration.

Answers

Answer:

Acceleration, $a=2.33\ m/s^2$

Explanation:

It is given that,

Initial speed of Shelly, u = 0

After 6 seconds, she has reached a final velocity of 14 m/s, v = 14 m/s

We need to find the acceleration of Shelly. The formula to find the acceleration is given by :

$a=(v-u)/(t)$

$a=(14\ m/s-0)/(6\ s)$

$a=2.33\ m/s^2$

So, the acceleration of Shelly's is $2.33\ m/s^2$ . Hence, this is the required solution.

divide 14 by 6 and there is your answer with the unit of m

The majority of visible stars are _____ stars.a. neutron
b. red giant
c. white dwarf
d. main sequence

Answers

Answer:

The correct answer is D. The majority of visible stars are main sequence stars.

Explanation:

The Main Sequence in a Hertzsprung-Russell diagram is a curve along which most stars are. A star in the main series is called a Main Sequence star.

The sun is an example of a main series star: it has been there for about 4.5 billion years and will continue so for another about 4.5 billion years. After the hydrogen in the core of the sun has been consumed, it will begin to burn helium, swell and become a red giant star.

The majority of visible stars are neutron stars. The answer is letter A. The rest of the choices do not answer the question above.

how much time would it take for an airplane to reach its destination if it traveled at an average speed of 790 kilometers/hours for a distance of 4700 kilometers? what is the airplanes speed in miles/hours?

Answers

If the airplane covered 790 kilometers along the ground every hour,
and if it could keep that up, and if there was no wind, and if the
airplane pointed its nose directly toward its destination and never
zigged or zagged even the slightest bit, then it would cover
790 kilometers of the distance during the first hour, another
790 kilometers of the distance during the second hour, another
790 kilometers of the distance during the third hour, 790 more
kilometers of the distance during the fourth hour, and so forth
and so on until it had arrived at its destination.

The minimum time it would need for the total trip would be

   (4,700 kilometers) / (790 kilometers per hour) =

   5.9494... hours (rounded)

   5hours 56m 57.7seconds (rounded) .

(790 kilometers) x (1 mile / 1.609344 kilometers) = 490.88 miles (rounded)

$t = ( \Delta S)/( \Delta V) \n \n t = (4700)/(790) \n \n t \approx 5.95 hours.$

1 kmph is approx. 0.6214 mph.
Then.. 790 will be approx. 490 mph.

Entropy is closely related to thea. second law of thermodynamics.
b. first law of thermodynamics.
c. both of the above
d. none of the above

Answers

The answer is A. Second law of thermodynamics.

The second law of thermodynamics states that entropy must increase in order for irreversible thermodynamic processes to occur. In idealized processes, the entropy is constant. This follows the principle that entropy always increases due to the natural disorder and randomness of processes.

What is heat?What are it's units?

Answers

Answer:

As a form of energy, heat has the unit joule (J). The standard unit for the rate of heat transferred is the watt (W), defined as one joule per second.

heat is a form of energy therefore the unit of heat is the same as that of energy has the CGS unit of heat is erg and its SI unit is Joule

relationship between Joule and erg is --

$10 J = 10⁷ erg$

other unit of heat are calories kilocolries

$relationship \: between \: calorie \: and \: joule </p><p>1 calorie = 4 .18 \: j(or \: nearly \: 4.2 \: j \: ) \n \n 1 \: kilocalorie \: = 4.18 \: * 10 \: cube \: j$

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A motorboat travels directly east. During its trip, winds blow from directly north, directly south, and southwest. Which of the following statements is true? A. All of the winds do work on the boat. B. Only the north wind does work on the boat. C. Only the south wind does work on the boat. D. Only the southwest wind does work on the boat.

A bus slams on its breaks and goes from 30 km/hr to 15km/hr in 4 seconds. What is its acceleration?

If 105 J of energy is used in 103 s, what is the average power consumption in watts?