A fuel-filled rocket is at rest. It burns its fuel and expels hot gas. The gas has a momentum of 1,500 kg x m/s backward. What is the
momentum of the rocket?
a
0
b
-1,500 kg x m/s forward
1,500 kg x m/s forward
с

Answer:

The correct answer is D. Static friction is much stronger than kinetic friction, so it takes more force to get an object moving than it does to keep it moving.

Explanation:

We can eliminate choice A if we know that both static friction and kinetic friction depend on what are called the coefficients of static friction and kinetic friction, respectively.  These coefficients are a reflection of the nature of the surface.  In other words, both static friction and kinetic friction depend on the surface material (choice A is incorrect).

Choice B is incorrect because static friction applies to still (static) object whereas kinetic friction applies to moving objects (that have kinetic energy).

Choice C is also incorrect.

Choice D is correct as described in the given information.  It takes much more force to start an object from rest than to keep it moving.  Think about things in your everyday life - it takes a push to get a toy car moving along the ground, but you do not need to consistently push the car with the same force to keep it moving.  This reflects that static friction is much stronger than kinetic friction, which is also described by the relationship between their coefficients (the coefficient of static friction is generally greater than that of kinetic friction).

Hope this helps!

Answer:

Astronomers estimate the age of the universe in two ways: 1) by looking for the oldest stars; and 2) by measuring the rate of expansion of the universe and extrapolating back to the Big Bang; just as crime detectives can trace the origin of a bullet from the holes in a wall.

Explanation:

Answer: the answer should be 6,720 decameters.

Answer:

67.2 kilometers =6720 decamaters

Answer:

Displacement = -6m

Distance = 24m

Explanation:

From the position time graph given above, the displacement of the armadillos will base on the distance covered with direction in consideration.

Displacement = (15 - 6) - 15

Displacement = 9 - 15

Displacement = - 6m

While distance will be:

Distance = (15 - 6) + 15

Distance = 9 + 15

Distance = 24 m

Answer:

See attached (No Decimals Needed)

Explanation:

ANSWER- I GUESS IT SHOULD BE GRAVITATIONAL FORCE.......

Answer:

GRAVITATIONAL FORCE

Answer:

2 N

Explanation:

From the question, it's given that

Mass m = 0.2 kg

Acceleration a = 10 m/s^2

The force a soccer goalie experience when stopping a ball will be equal to the force at which the ball is being kicked. This is

F = ma

Substitute all the parameters into the formula

F = 0.2 × 10

F = 2 Newton.

Answer:

c

Explanation:

i got it rigth on the quiz

Answer:

405000 g

Explanation:

1hg(hectogram)=100g

Therefore,

400000g+5000g=405000 g

Answer:

Explanation:

From newton's equation of motion of uniform acceleration

v = u + at

where v is final velocity , u is initial velocity , a is acceleration and time is t .

putting the values

v  =  0 + .5 x 3 x 60  ( time in second = 3 x 60 s )

= 90 m /s

So  , final velocity is 90 m /s .

Answer:

The vertical acceleration is -9.81 m/s^2

Explanation:

When a body is projected, the body experiences an acceleration in the vertical axis that is proportional to the acceleration due to gravity of the earth, which is equal to 9.81 m/s^2. In this case, the acceleration acts to stop the vertical motion of the paper plane, and hence is a deceleration, which explains the negative vertical acceleration.

Answer:

A

Explanation:

Answer:

Classical physics refers to theories of physics that predate modern, more complete, or more widely applicable theories. If a currently accepted theory is considered to be modern, and its introduction represented a major paradigm shift, then the previous theories, or new theories based on the older paradigm, will often be referred to as belonging to the realm of "classical physics".

As such, the definition of a classical theory depends on context. Classical physical concepts are often used when modern theories are unnecessarily complex for a particular situation. Most usually classical physics refers to pre-1900 physics, while modern physics refers to post-1900 physics which incorporates elements of quantum mechanics and relativity.

Answer:

Displacement

Explanation:

Velocity is more like displacement because

Both have an arrow above their signs which indicates they are vectors.

Hope this helps ;) ❤❤❤

Answer:

Explanation:

velocity=s/t

given distance is 480 km we have to convert it into meter because the unit of distance is meter

1 km=1000 m

480 km=480000 m =4.8*10^5

1 hour= 3600 s

12 hour =43200 s  

now velocity=s/t

v=4.8*10^5/43200

v=11.11 m/s

Answer:

The correct answer is 40

Explanation:

Divide 480 and 12 that  = 40v

Hoped I helped

Answer:

A) 5 kilograms is the largest and the heaviest out of all.

Answer:

0.00222km/s

Explanation:

[tex]Distance = 0.2km\\Time = 1\:minute \:30\:seconds = 90\:seconds\\\\Average \:speed =?\\\\Average \:speed = \frac{0.2}{90} \\A.V = 0.002222\\A.V =0.00222[/tex]

Answer:

98 N

Explanation:

Given that

Mass m = 10 kg

Acceleration due to gravity g = 9.8m/s^2

Where the weight of an object is the product of its mass, and the acceleration of gravity. That is,

W = mg

Substitute all the parameters into the formula

W = 10 × 9.8

W = 98 N

Therefore, the weight of the object is 98 Newton

The parenchyma is widely distributed in plant body such as stem , roots, leaves, flowers and fruits. The parenchyma tissue is found in the soft parts of the plants such as cortex of roots, ground tissue in stems & mesophyll of leaves. It is also distributed in pith , medullary rays & packing tissue in xylem and phloem. They forms the bulk of the plant body they are living and possesses the power of their division. Parenchyma cells have living Protoplasm.

The main function of parenchyma is to store an assimilate food. Parenchyma serves as food storage tissue.

Answer:

magnitude of gravitational force between the Earth and the Sun at B is greater than that at A

Explanation:

Formula of gravitational force:

F = GMm/r^2

(r is the distance between 2 objects)

We see that r(B) < r(A) since at B, the Earth is closer to the Sun than at A

According to the Formula, the smaller r is, the greater F is

So, F(B) > F(A)

Answer:

The impulse of the collision in system A is twice the impulse of the collision in system B. (Last choice)

Explanation:

I just took the quick check and got it wrong for putting what the other person put, which I should've gone with my first choice. The answer above is correct. I really hope this helps!

The correct statement about systems A and B is ; ( D ) The impulse of the collision in system A is twice the impulse of the collision in system B

Momentum is a product of the mass and velocity of particles in motion while impulse is the rate of change of the momentum of particles/objects when a force acts on the object.

The momentum of a particle is proportional to its impulse therefore as momentum in system A changes at twice the rate of change of the momentum in system B the impulse of the collision in system A is also twice the impulse of the collision in system B

Hence we can conclude that The correct statement about systems A and B is The impulse of the collision in system A is twice the impulse of the collision in system B

Learn more : https://brainly.com/question/20182620

Answer & Explanation:

If the resultant force is zero, a moving object towards the right will stay at the same speed. If there is no resultant force then a system is said to be in equilibrium.

If the resultant force is not zero, due to a force towards left of a moving object will slow down - depending on the direction of the resultant force:

it will speed up if the resultant force is in the same direction as the object is moving

it will slow down if the resultant force is in the opposite direction

Please note that the object could also change direction, for example if the resultant force acts at an angle.

Explanation:

The frequency of an organ pipe if it is open is given by :

[tex]f=\dfrac{nv}{2l}[/tex]

v is speed of sound in air is 343 m/s at 20°C

For fundamental frequency, n = 1

[tex]f=\dfrac{1\times 343}{2\times 0.26}\\\\f=659.61\ Hz[/tex]

First overtone frequency,

[tex]f_1=2f\\\\f_1=2\times 659.61\\\\f_1=1319.22\ Hz[/tex]

Second overtone frequency,

[tex]f_2=3f\\\\f_2=3\times 659.61\\\\f_2=1978.83\ Hz[/tex]

Third overtone frequency

[tex]f_3=4f\\\\f_3=4\times 659.61\\\\f_3=2638.44\ Hz[/tex]

Hence, this is the required solution.

Answer:

50.09 km/h

Explanation:

Given that an airplane flying due north at 90 km/h is being blown due west. The planes total velocity is 103 km/ hr north west.

What is velocity of the wind ?

The wind velocity can be calculated by using pythagorean theorem.

From the question,

Resultant Velocity R = 103 km/h

Plane velocity P = 90 km/h

Wind velocity W = ?

W^2 = R^2 - P^2

Substitutes all the parameters into the formula

W^2 = 103^2 - 90^2

W^2 = 10609 - 8100

W^2 = 2509

W = sqrt ( 2509 )

W = 50.09 km/h

Therefore, the velocity of the wind is 50.09 km/h

Answer:

Hey there!

Stopwatch X recorded 40 seconds, and stopwatch Y recorded 50 seconds.

Stopwatch Y recorded 10 seconds longer than stopwatch X.

Hope this helps :)

Answer:

Explanation:

Stopwatch X recorded 40 seconds, and stopwatch Y recorded 50 seconds.

Stopwatch Y recorded 10 seconds longer than stopwatch X.

Answer:

hello the options to your question is missing below are the options

culture

heredity

physical environment

social environment

answer : social environment

Explanation:

Claire ability to lose weight due to the encouragement and support of her friends shows that she was ability to achieve her goal due to her social circle ( friends ). therefore the face time that helped her lose weight is her social environment and not culture nor any other option as mentioned above.

social environments help/play a vital role in individual's life a lot as long as every human being is a social being

Answer:

N/A

Explanation:

No Image provided

Answer:

there is no picture to help us help you get the answer so please put up a picture.

Explanation:

Answer:

P = 200 W

Explanation:

The expression for the power is

        P = W / t

the job

       W = F d

we substitute

      P = F d / t

      P = F. v

We apply this equation to our case where the velocity is

 v = (5 i + 3j + 6k) m / s

and the force is

 F = (10i + 10j +20 k) N

we substitute in the power equation, remember that the scalar product of the unit vectors is

i.i = j.j = k.k = 1 and the other products are zero

    P = 10 5 + 10 3 + 20 6

    P = 200 W

Answer:

Change in force = 1.66 × 10⁵ N

Explanation:

Given:

Initial pressure = 837 mmHg

Final pressure = 842 mmHg

Rectangle (10 m ⨯ 25 m)

Find:

Change in force

Computation:

Change in force = (Change in pressure)(Area)(133 pa / 1 mmHg)

Change in force = (842 - 837)(10 m ⨯ 25 m)(133 pa / 1 mmHg)

Change in force = (166,250)

Change in force = 1.66 × 10⁵ N

Answer: An exothermic reaction is a chemical reaction in which less energy is needed to break bonds in the reactants than is released when new bonds form in the products. During an exothermic reaction, energy is constantly given off, often in the form of heat.

Explanation: An exothermic reaction is a chemical reaction in which less energy is needed to break bonds in the reactants than is released when new bonds form in the products. During an exothermic reaction, energy is constantly given off, often in the form of heat.

Hope this helps^^

Answer:

Force.

Explanation:

SImple as that. think of Newtons Laws.

Answer:

B

Explanation:

Answer:

c. the acceleration is constant and positive

Explanation: