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3 years ago

Calculate the acceleration of a car that can go from rest to 100 km/h in 10 seconds

Physics

1 answer:

Basile [38]3 years ago

8 0

Answer: $2.77 m/s^{2}$

Explanation:

Acceleration $a$ is defined as the variation of velocity $\Delta V$ with time $\Delta t$ :

$a=\frac{\Delta V}{\Delta t}$

Where:

$\Delta V=100km/h-0km/h=100km/h=27.77m/s$

$\Delta t=10 s$

$a=\frac{27.77m/s}{10 s}$

Finally:

$a=2.77m/s^{2}$

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A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials’ boat pulls

babunello [35]

Answer:

They are 7.4m apart.

Explanation:

Here we have a parabolic motion problem. we need the time taken to land so:

$Y=Yo+Vo*t+\frac{1}{2}*a*t^2$

considerating only the movement on Y axis:

$0=4.6-(9.81)*t^2\\t=0.68s$

Because we have a contant velocity motion on X axis:

$xs=vs*t\\xs=17m/s*(0.68s)\\xs=11.6m$

and

$xg=vg*t\\xg=28m/s*(0.68s)\\xg=19m$

the distance between them is given by:

$d=|xg-xs|\\d=7.4m$

7 0

3 years ago

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Trava [24]

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8 0

3 years ago

Hurricanes are least likely to form in which of the following?

Sholpan [36]

The best and most correct answer among the choices provided by the question is the second choice "Lake Michigan"

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I hope my answer has come to your help. God bless and have a nice day ahead!

3 0

3 years ago

A 2kg book is moved from a shelf that is 2m off the ground to a shelf that is 1.5m off the ground, what is it’s change in gravit

Ket [755]

The gravitational energy is going up subtracting the energy that was on the ground

3 0

3 years ago

A hockey puck has a mass of 0.107 kg and is at rest. A hockey player makes a shot, exerting a constant force of 28.0 N on the pu

gregori [183]

Answer:

The speed does it head toward the goal = 41.87 $\frac{m}{s}$

Explanation:

Mass = 0.107 kg

Initial velocity ( u ) = 0

Force (F) = 28 N

Time = 0.16 sec

From newton's second law, Force = mass × acceleration

⇒ F = m × a

⇒ 28 = 0.107 × a

⇒ a = 261.7 $\frac{m}{s^{2} }$ --------- (1)

This is the value of acceleration.

Final speed of the mass is calculated by the equation V = U + at

⇒ U = 0 because mass in in rest position at start.

⇒ V = a t

Put the values of acceleration and time in above formula we get

⇒ V = 261.7 × 0.16

⇒ V = 41.87 $\frac{m}{s}$

Therefore the speed does it head toward the goal = 41.87 $\frac{m}{s}$

5 0

3 years ago