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3 years ago

The force is the sum of all the forces that act upon an object.

2 answers:

5 0

the forces acting on an object is the net force or resultant force. ... Force is a vector and hence has both a direction and magnitude. For example, gravitational force (on earth) acts in downward direction and has a magnitude equal to mass of the object and acceleration due to gravity.

LUCKY_DIMON [66]3 years ago

3 0

Answer:

Explanation:

The net force or resultant force is sum of all the forces act upon an object. As force is a vector quantity it has both magnitude as well as direction. so net force is calculated by keeping direction of application in mind such as friction force is always acts in the direction opposite to the motion of object and gravitational force always acts downwards.

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It’s estimated that there are a trillion comets in the Oort cloud, which extends out to about 50,000 AU.How much space does each

dexar [7]

Answer:

Each comet has 523 UA³
The typical spacing would be 8.05 UA
2.0181x10^21 Joules

Explanation:

Assuming comets are evenly distributed we can find first the volume of a sphere with the formula frac{{4}{3}}πr³ using 50000 as the radius, and then dividing this volume by the amount of comets. This gives a the space each comet has on average.
We apply the cube root as proposed in the question.
The kinectic energy is given <em>K=frac{{1}{2}}mv² where m is the mass and v is the velocity. Apropriate unit are given in the question.</em>

5 0

4 years ago

A dog sees a flowerpot sail up and then back past a window 5.0 ft high. If the total time the pot is in sight is 1.0 seconds, fi

Kisachek [45]

To solve this problem we will use the linear motion kinematic equations for which acceleration (in this case gravity) is described as the change in velocity in an instant of time. Subsequently through the energy conservation equations we will find the net height.

Let's start considering that the time is 1 second, therefore,

$t = 1s$

Now the acceleration would be given as

$g = \frac{\Delta v}{t}$

$g = \frac{v_f-v_i}{t}$

$v_f-v_i = gt$

Since the final speed is zero, and the time elapsed to reach the height is 0.5 seconds (half of the entire route) we will have that the initial speed can be expressed in terms of gravity as

$0-v_i = g(\frac{1}{2})$

$v_i = \frac{1}{2} g$

Now for energy conservation, the potential energy must be equal to the kinetic energy, therefore,

PE = KE

$mgh = \frac{1}{2} mv_i^2$

$h = \frac{v_i^2}{2g}$

Replacing the previous value found,

$h = \frac{1}{4} \frac{g^2}{2g}$

$h = \frac{1}{4} \frac{9.8^2}{2(9.8)}$

$h = 1.225m$

Therefore the hegiht above the windows that the pot rises is 1.225m

4 0

3 years ago

A bullet is fired through a board 13.0 cm thick in such a way that the bullet's line of motion is perpendicular to the face of t

GREYUIT [131]

Answer:

392307.6923 m/s²

Explanation:

t = Time taken

u = Initial velocity = 560 m/s

v = Final velocity = 460 m/s

s = Displacement = 13 cm

a = Acceleration

From the equation of motion we have

$v^2-u^2=2as\\\Rightarrow a=\dfrac{v^2-u^2}{2s}\\\Rightarrow a=\dfrac{460^2-560^2}{2\times 13\times 10^{-2}}\\\Rightarrow a=-392307.6923\ m/s^2$

The acceleration of the bullet as it passes through the board is -392307.6923 m/s²

5 0

3 years ago

A basketball seems flat after being left out in cold. Once it warms up, it seems fine. Explain why.

Tema [17]

The cold air increases pressure on the basketball, causing it to appear flat. When it warms up that pressure is taken off, so the basketball is at it's normal state.

4 0

3 years ago

PLEASE help

Natalija [7]

Answer:

Explanation:

initial velocity = 24m/s

final velocity = 0 ( since she is coming to a rest )

time = 12 s

∴ acceleration = final velocity - initial velocity / time

= 0 -24 / 12

= -24/12

= -2 m/s

hope this helps

plz mark it as brainliest

6 0

3 years ago

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