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kkurt [141]
2 years ago
6

An object is moving in the absence of a net force. Which of the following best describes the object's motion? -please help?

Physics
2 answers:
Gelneren [198K]2 years ago
7 0
You can solve this by using Newton's First Law or Newton's Second Law.

1) Newton's First Law or Inertia Law states that in the abscense of a net force acting over an object, this will not chage its state of movement, i.e it will  remain at rest (if it is no moving) or with uniform movement (if the object is moving).

2) Newton's Second Law: Net force = mass * acceleration => acceleration = net force / mass = 0 / mass = 0.

Zero accelerations means rest or uniform movement.

First Law is implicit in Second Law.
anzhelika [568]2 years ago
7 0
There are two cases in which no net force is being applied on an object:
1) The object is stationary
2) The object is not accelerating; that is, the magnitude or direction of its velocity is not changing.
Because this question requires the object to be in motion, the velocity of this object must be constant but non-zero.
Therefore, the correct option would be the one where the velocity is constant and in a straight line. (circular motion means the velocity's direction is constantly changing, thus the velocity is not constant)
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A solid box made from a material whose density is rhoS floats with two thirds of its volume submerged in a liquid whose density
jok3333 [9.3K]

Answer:

\frac{\rho_S}{\rho_L} = \frac{2}{3}

Explanation:

density of the solid box material = \rho_s

density of the liquid material = \rho_L

Given that

solid box floats with two thirds of its volume submerged in a liquid

let V be the volume of the box

then,

V\rho_sg= \frac{2V}{3}\rho_L g

⇒\frac{\rho_S}{\rho_L} = \frac{2}{3}

so, the ratio of densities of solid and and the liquid is 2/3

7 0
3 years ago
Sound travels at a speed of 330 m/s. If a lightning bolt strikes the ground 3 km away from you, how long will it take for the so
mestny [16]

Answer: 9.09 seconds

Explanation:

Given that,

speed of sound = 330 m/s

Distance away = 3 km

(since the SI unit of distance is metres, convert 3km to metres

1km = 1000 metres

3km = (3 x 10000) = 3000 metres

Time it take for the sound to reach you = ?

Now, recall that speed is obtained by dividing distance travelled by the time taken.

i.e speed = distance / time

330 m/s = 3000 m / time

Time = 3000 m / 330 m/s

Time = 9.09 seconds

Thus, it will take 9.09 seconds for the sound to reach you.

3 0
3 years ago
Which is an action that can cause an object to move or change its state of motion? energy, force, equilibrium, or inertia?
Licemer1 [7]
<span>an action that can cause an object to move or change its state of motion is force</span>
8 0
3 years ago
Read 2 more answers
A spring with a spring constant of 1200 N/m has a 55-g ball at its end. The energy of the system is 5.5J. What is the amplitude
ad-work [718]
You reach the max amplitude when all the energy is in the spring and the kinetic energy of the ball is zero.

4 0
3 years ago
Read 2 more answers
a 10kg box is pulled up a ramp that is at an angle of 20 degrees with the horizontal if the pulling force of 70 N causes an acce
ivolga24 [154]

Answer:

Friction = 15.80 Newton

Explanation:

    given

             A pulling force (F) is 70N acting on the block of 10kg (M) which is placed on the ramp which is at an angle of 20° with the horizontal.

            Irrespective to the ramp ,Weight of the body acts vertically downward , if we resolve the components of W=Mg as Mgsin20° (along the ramp) and Mgcos20° (perpendicular to the ramp) as shown in the attachment which contains FBD of the block

           as given the body is Accelerating with an acceleration (a) of 2 m/s^{2} due to the pulling force . As friction always opposes the motion it acts in the backward direction to the pulling force .as shown in the figure attached

         By Newton's 2nd Law

                 Ma = F - MgSin20°-friction

                by subtituting the values we get

                10(2) = 70 - 10(10)sin20° - friction

                  friction =70 - 100sin20° -20

                  friciton = 15.7979N

                  by rounding of ,

                              Frictional force is 15.80 Newton

           

3 0
3 years ago
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