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3 years ago

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What causes a liquid to freeze? A. When particles speed up and get closer together. B. When particles stop moving. C. When parti

cles slow down and get closer together. D. When particles speed up and get farther apart.

1 answer:

Fittoniya [83]3 years ago

3 0

Answer:The answer is C

Explanation:

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In this first example of constant accelerated motion, we will simply consider a car that is initially traveling along a straight

algol13

Answer:

$v_{f} =25m/s$

Explanation:

Kinematics equation for constant acceleration:

$v_{f} =v_{o} + at=15+2*5=25m/s$

4 0

3 years ago

A speed-time graph is shown below:

alexandr1967 [171]

Answer:

<em>The average acceleration of the object is 0.5 cm/s^2</em>. Answer: A)

Explanation:

<u>Average Acceleration</u>

The average acceleration of a moving object is the rate at which the speed changed over time in a specific period. It can be calculated as follows:

$\displaystyle \bar a=\frac{v_f-v_o}{t}$

Where vf is the final speed, vo is the initial speed and t is the time.

The speed-time shows the speed starts at 0 cm/s and ends at 4 cm/s over the 8 seconds period. The average acceleration is:

$\displaystyle \bar a=\frac{4-0}{8}=0.5$

The average acceleration is 0.5 cm/s^2

A) Correct. The average acceleration is 0.5 cm/s^2

B) Incorrect. The average acceleration is 0.5 cm/s^2

C) Incorrect. The average acceleration is 0.5 cm/s^2

D) Incorrect. The average acceleration is 0.5 cm/s^2

3 0

3 years ago

The force of ___ always turns mechanical energy into thermal energy

JulijaS [17]

Friction but i may be wrong

7 0

4 years ago

Suppose the universe were completely empty except for one object- a solid sphere moving through space at a speed of 100km/s. wha

vladimir2022 [97]

Straight linear path

Explanation:

If the universe were completely empty with just one object which is solid moving sphere through the space at a speed of 100km/s, it will move along on a straight path.

An object will continue on a straight path or at rest unless acted upon by an external force. This is the first law of newton.

Since there is no other mass or body in the universe, it will move along in a straight line.
Our planet and other bodies moves in parabolic path and elliptical orbits because they are attracted by the gravitational forces of other bodies.
Any body with mass will attract other bodies and makes it move round it.
The body with the less mass will orbit in the vicinity of the larger mass.
But if we have just one body out there, there is no attraction from any other body, it will continue along it's straight path.

learn more:

Gravitational force brainly.com/question/4417434

#learnwithBrainly

8 0

3 years ago

Can someone help me?!!!!!

kramer

Answer:

Parabola

Explanation:

The motion of a projectile consists of two independent motions:

- A uniform motion along the horizontal (x) direction, with constant velocity $v_x$ . In fact, there are no forces acting along this direction (if we neglect air resistance), so the acceleration is zero and the velocity is constant

- An uniformly accelerated motion along the vertical (y) direction, with constant acceleration $g=9.8 m/s^2$ downward (acceleration due to gravity). This acceleration is due to the force of gravity that pulls the projectile downward.

The composition of these two motions gives a parabolic trajectory. In fact, the equations of the motion along the two directions are:

$x(t) = v_x t$ (1)

$y(t) = h + v_y t - \frac{1}{2}gt^2$ (2)

Solving for t in eq.(1),

$t=\frac{x}{v_x}$

and substituting into (2)

$y(t) = h + \frac{v_y}{v_x}x - \frac{1}{2}g(\frac{x}{v_x})^2$

which is the equation of a parabola.

5 0

3 years ago