If an object is moving with a constant velocity then according to Newton's first law:
A- it will continue with this velocity only if a net external unbalanced force acts.

B- it will change its velocity if a net unbalanced external force is applied.

С- it will continue with its velocity as external unbalanced force acts.

D- it will continue with its velocity as friction only acts if an external unbalanced force is applied.

Answer:

which objects? can you be more precise

Answer:

A. An object that's thrown horizontally off a cliff and allowed to fall

B. An object thrown upward at an angle                                                             Explanation:

An object exhibits a two-dimensional motion if it can be described by both x and y coordinate components.This means you can describe it using a vector with the horizontal and vertical components.For example,a graph of a body that moves with a constant velocity,the sum of the velocities in the x and y directions can describe this object's position.The same with kicking a ball.The ball will rise up at an angle, where you will have the horizontal component in the x-axis direction and the vertical component in the y-axis direction.

So for the case of this question, when an object is thrown horizontally, the horizontal component is initiated which will be represented by the x-axis vector.When it is allowed to fall down, the vertical component is initiated, in this case it will be a negative vector.An object thrown upward at an angle behaves like a ball kicked at an angle.

Answer:

0.4 meters per second I believe

We have that  the the instantaneous speed is given as

[tex]v=15m/s[/tex]

From the Question we are told that

Calculate the instantaneous speed

Accelerates at

[tex]a=10 m/s2 \\\\t= 1.5 seconds.[/tex]

Generally the equation for the  instantaneous speed is mathematically given as

[tex]v=\frac{d}{t}[/tex]

Acceleration

[tex]a=\frac{v}{t}[/tex]

Therefore

[tex]v=10*1.5\\[/tex]

[tex]v=15m/s[/tex]

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Answer:

There is lots of evidence to support it, is the correct answer

The reason why evolution is regarded as a scientific theory is because there are lots of scientific evidences to support it.

Evolution refers to the scientific thinking that complex life forms came out of simple life forms. The complex sequence of events that occurred during the transformation of simple life forms to complex life forms are described by the theories of evolution.

The reason why evolution is regarded as a scientific theory is because there are lots of scientific evidences to support it.

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Answer: c is the correct answer

Explanation:

Option C is the correct answer.

Definition of Science: A way of discovering and knowing about the world.

Science

Science can be defined as the knowledge and understanding of the natural and social world following a systematic methodology based on evidence.

The scientific methodology includes objective observation, measurement and data evidence.

Science is a system of observations and experiments used to gain knowledge about how the universe works. Observations describe how and why things happen the way they do. Experiments are investigations used to explain how the world works.

Hence option C represents the best definition.

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Explanation:

Let

[tex]x_1[/tex] = distance traveled while accelerating

[tex]x_2[/tex] = distance traveled while decelerating

The distance traveled while accelerating is given by

[tex]x_1 = v_0t + \frac{1}{2}at^2 = \frac{1}{2}at^2[/tex]

[tex]\:\:\:\:\:= \frac{1}{2}(2.5\:\text{m/s}^2)(30\:\text{s})^2[/tex]

[tex]\:\:\:\:\:= 1125\:\text{m}[/tex]

We need the velocity of the rocket after 30 seconds and we can calculate it as follows:

[tex]v = at = (2.5\:\text{m/s}^2)(30\:\text{s}) = 75\:\text{m/s}[/tex]

This will be the initial velocity when start calculating for the distance it traveled while decelerating.

[tex]v^2 = v_0^2 + 2ax_2[/tex]

[tex]0 = (75\:\text{m/s})^2 + 2(-0.65\:\text{m/s}^2)x_2[/tex]

Solving for [tex]x_2,[/tex] we get

[tex]x_2 = \dfrac{(75\:\text{m/s})^2}{2(0.65\:\text{m/s}^2)}[/tex]

[tex]\:\:\:\:\:= 4327\:\text{m}[/tex]

Therefore, the total distance x is

[tex]x = x_1 + x_2 = 1125\:\text{m} + 4327\:\text{m}[/tex]

[tex]\:\:\:\:= 5452\:\text{m}[/tex]

D. Length of content.

Reliable sources need to be accurate, they need to make sense at the time they were created and the author needs to not be biased with their writing. It does not matter how long the content is as long as it is reliable.

In the human cannonball act makes use of of a special type of "cannon" that more safely ejects a person who acts as the "cannonball"

The world record for the longest flight by a human cannonball is approximately 194 feet and therefore the human cannon catapult that Bobo would need is one that would be able to propel him with an initial velocity of more than 120 kilometer per hour (more than the speed of the current record holder) with the cannon directed at an angle 45 degrees above the horizonal

The reason the values given above are correct is as follows:

The world record of the furthest range of the human cannonball is 193 ft. 8.8 inches. The maximum claim for the furthest range of a human cannonball is 200 ft. 4 in. Therefore, to safely set the world record would be to reach a range of 194 feet

The speed with which the world record was accomplished (120 km/jhr)  should be expected to be exceeded given, horizontal speed in free fall motion is constant (decreasing in the presence of drag), and the conditions are likely to be more or less similar

In order to reach the furthest range, R, at the possible speed, the angle of inclination of the "cannon" required is 45°, according to the range formula, which is given as follows;

[tex]Range, \ R = \dfrac{v^2 \times sin(2\cdot \theta)}{g}[/tex]

The maximum range is given where θ = 45, such that sin(2·θ) = sin(90°) = 1

A further range than the world record van be obtained using the above values

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Answer:

The positive velocity occurs the instant the coin leaves our hand. It immediately begins slowing up until its upward velocity becomes zero at the maximum height. At this instant it begins to fall and its velocity increase in a negative direction. The velocity reaches its maximum negative value the instant before it touches your hand.

Answer:

Newtons First Law (The Law of Inertia)- If an object is at rest it will stay at rest until a net force acts on it. If an object is in motion it will stay in motion until a net force acts on it.

Newtons Second Law (F=ma)- Force equals the mass of an object times it's acceleration.

Newton's Third Law- For every action there is an equal and opposite reaction.

hope this helps!

Answer:

v = 10 m/s

Explanation:

Let's assume the wheel does not slip as it accelerates.

Energy theory is more straightforward than kinematics in my opinion.

Work done on the wheel

W = Fd = 45(12) = 540 J

Some is converted to potential energy

PE = mgh = 4(9.8)12sin30 = 235.2 J

As there is no friction mentioned, the remainder is kinetic energy

KE = 540 - 235.2 = 304.8 J

KE = ½mv² + ½Iω²

ω = v/R

KE = ½mv² + ½I(v/R)² = ½(m + I/R²)v²

v = √(2KE / (m + I/R²))

v = √(2(304.8) / (4 + 0.5/0.5²)) = √101.6

v = 10.07968...

Answer:

Basically, it's motion of a object.

100% smart.

Yup, 100% wrong.......

[tex]AnimeVines[/tex]

Answer:

the branch of mechanics concerned with the motion of objects without reference to the forces which cause the motion.Compare with dynamics.

Explanation:

i looked it up it

Answer:

For straight line motion, positions can be shown using a number line. The separation between original and final position is called displacement.

EXPLANATION:For straight line motion, positions can be shown using a number line. The separation between original and final position is called displacement.

Explanation:

the formula for momentum is denoted by p=mv where p is momentum, m is mass and v is velocity. thus, the velocity before impact would be 0.060 x 30 = 1.8 kg/ms

the second one would just be 0.060 x 20 0.72kg/ms

I'm not 100 percent sure this is correct but yeah

Answer:

They will be moving away from each other at the same speed.

Explanation:

The final speed may be identical to the initial speed if the collision is perfectly elastic. The final speed will be zero if the collision is perfectly in-elastic.

In all likelihood, the final speed will be slightly slower than the initial speed.

Answer:

B 20 sec

Explanation:

if you look at 1992 you can see that it is on 20 sec

The approximate winning time UK the 1992 Olympics as depicted by the scatterplot is 20 seconds.

Therefore, the value of the dot on the y - axis is 20 seconds, hence, the winning time of the 1992 Olympics.

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Average Velocity=Total Distance/Total Time

[tex]\\ \sf\longmapsto \dfrac{2.5}{9.1}[/tex]

[tex]\\ \sf\longmapsto 0.3m/s[/tex]

We can define average velocity as:

av = (total distance travelled)/(total time)

Only using the above equation, we will find that she walked 807.3m due east.

The given information is:

The average velocity is 1.34 m/s due west.

(we can define west as the positive side and east as the negative side).

We know that first, she hikes 6.44km due west with an average velocity of 2.68 m/s.

To get the total time it took we write the equation:

2.68 m/s = (6,440m)/(time)

time = 6,440m/(2.68 m/s) = 2,402.9 seconds.

Then she hikes a distance D due east with an average velocity of 0.447 m/s, because she goes due east, we will write -D in the equations.

Now using the same equation as before, we can get the time as:

time' = -D/(-0.447 m/s) = D/(0.447 m/s)

Now the equation for the total average velocity will be:

1.34 m/s = (6,440m - D)/(2,402.9 s +  D/(0.447 m/s))

Now we need to solve this for D.

(1.34 m/s)*(2,402.9 s +  D/(0.447 m/s)) =  (6,440m - D)

(1.34 m/s)*(2,402.9 s) + (1.34 m/s)*(D/(0.447 m/s) =6,440m - D

(1.34 m/s)*(D/(0.447 m/s) + D = 6,440m - (1.34 m/s)*(2,402.9 s) = 3,229.1 m

D*(1 + (1.34m/s)/(0.447 m/s)) = 3,229.1 m

D*4 = 3,229.1 m

D =  3,229.1 m/4 = 807.3 m

We can conclude that she walked 807.3m due east.

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We have that the total distance traveled by the  backpacker is

[tex]d_t=5.6km[/tex]

From the Question we are told that

Total Average velocity [tex]V_{avg}= 1.34 m/s,[/tex]

Distance [tex]d=6.44 km[/tex]

First average velocity [tex]V_{1 avg}= 2.68 m/s,[/tex]

Second average velocity [tex]V_{2 avg}= 0.447 m /s[/tex]

Generally the equation for Total Distance  is mathematically given as

[tex]d_t=d_1+d_2\\\\V_tT_t=(v_1t_1)+(v_2t_2)[/tex]

Where

[tex]t_1=\frac{d_1}{t_1}\\\\t_1=\frac{6440m}{2.68}\\\\t_1=2400s[/tex]

Therefore

[tex]V_tT_t=(v_1t_1)+(v_2t_2)[/tex]

[tex]1.34(T_t)=(2.68(2400))+(-(0.447t_2))[/tex] ...(due to change in direction)

[tex]1.34t_1+1.34t_2=6440-0.447t_2[/tex]

[tex]t_2=1804s[/tex]

Hence, the distance covered by her is

[tex]d_t=d_1+d_2\\\\d_t=(2.68(2400))+(-(0.447(1804)))\\\\d_t=5625.612m[/tex]

[tex]d_t=5.6km[/tex]

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hi <3

i believe i explained this answer properly in my last answer but it would be 4kg and 2400m as these are the SI units for these values.

hope this helps :)

hi :D

i believe i explained this answer properly in my last answer but it would be 4kg and 2400m as these are the SI units for these values.

hope this helps :)

Answer:

Hi, There! your Answer is Below!

10.29 m/s

Explanation:

a = -9.8

v = Vi - 9.8 t

h = 0 + Vi t - 4.9 t^2

-------------------------------

----------------------

at the top, t = .3 + 1.5/2 = 1.05

and v = 0 = Vi - 9.8(1.05)

so

Vi = 9.8(1.05) = 10.29 m/s

(Dont forget to mark thanks) :)

The initial velocity will be = u = 36.75 m/s

That describe the motion of point , bodies , and system of bodies without considering the force that cause them to move.

let that window at height h

it took 3 sec to reach that window and after crossing that window it took 1.5 second to come back to that same window

this implies , total time taken to to get to the top = 3sec + 1.5/2 = 3.75 sec

using equation of motion :

v = u + at

v= final velocity  =0(at top )

u = initial velocity =?

a = acceleration , a=g ( acceleration due to gravity) = 9.8 m/s^2

t= 3.75 sec

0 = u - 9.8(3.75)

u = 36.75 m/s

initial velocity will be = u = 36.75 m/s

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the kinetic energies of the particles (atoms,molecule,or ions)that make up up a substance. kinetic energy tends to keep the particles moving apart.

the attractive inter molecular forces between particles that tends to draw the particles together.

Explanation:

[tex]\huge\fbox\colorbox{pink}{❥Answer♡}[/tex]

Answer:

360

Explanation:

just add a 0 when using dm

Answer:

The capacity for doing work.

Explanation:

It has the forms kinetic, potential, thermal, electric, nuclear or other forms of energy.

In physics, the ability to do work is referred to as energy. It can be of several types like thermal, electrical, chemical etc.

The capacity to perform work is known as energy in physics. Potential, kinetic, thermal, electrical, chemical, nuclear, and other types are all possible. As energy is transferred from one body to another, there is also heat and work. Energy is always categorized after it has been transferred based on its nature. As a result, heat transfer may result in thermal energy, whereas labor may result in mechanical energy.

Motion is a common feature of all energy types. Whenever a body is in motion, for instance, it contains kinetic energy. Even while at rest, a tensioned object like a spring or bow can move; this is because of the configuration of the object, which carries potential energy.

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Answer

D)

Explanation:

Imagine throwing a ball upwards the ball will incress and then decrease make a arc shape.

The second graph represents the acceleration as a function of time of an object is thrown straight up, therefor the correct answer is option B

The rate of change of the velocity with respect to time is known as the acceleration of the object. Generally, the unit of acceleration is considered as meter/seconds².

As given in the problem an object is thrown straight up and its acceleration  vs time graph is plotted

As we know that the acceleration due to gravity is constant and always acts towards the center of the earth, when the object is thrown straight up its acceleration would remain constant due to the acceleration due to gravity. The acceleration due to gravity is constant with a value of 9.81 m/s²

Thus, The second graph represents the acceleration as a function of the time an object is thrown straight up, therefor the correct answer is option B

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Answer:

With a force of 1 Newton, an object weighing 100 grams is dragged towards the planet's center. On Earth, an item with a mass of 100 grams has a gravitational pull of only 1%, or about kg.

Explanation:

i hope this helps