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3 years ago

2. Which of the following is not used to calculate kinetic energy?

Physics

2 answers:

Komok [63]3 years ago

4 0

Answer:

speed cannot be used to calculate the temperature

astraxan [27]3 years ago

4 0

Speed :) hope this helps

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A truck using a rope to tow a 2230-kg car accelerates from rest to 13.0 m/s in a time of 15.0s. How strong must the rope be? μk

Leokris [45]

Answer:

The rope must have a force of 10084,21 N

Explanation

Acceleration calculation

The car acceleration is equal to the acceleration of the truck

ac: car acceleration $\frac{m}{s^{2} }$

at: truck acceleration $\frac{m}{s^{2} }$ )

$ac = at= \frac{vf-vi}{t-ti}$ equation(1)

Known information:

vi = Initial speed = 0, ti = initial time = 0

vf = Final speed = 13 $\frac{m}{s}$ , t = final time =5 s

We replaced the known information in the equation(1):

$ac = at = \frac{13-0}{15-0}$

$ac=ac=\frac{13}{15} \frac{m}{s}$

Dynamic analysis

The forces acting on the car are the following:

Wc: Car weight

N: normal force, road force on the car

Ff: Friction force

T: Force of tension

Car weight calculation:

$Wc=mc*g$

mc = Car mass = 2230kg

g = Gravity acceleration=9.8 $\frac{m}{s^{2} }$

$Wc= 2230*9.8$

$Wc=21854 N$

Normal force calculation:

Newton's first law

$sum Fy= 0$

$N-W=0$

$N=W$

$N=21854 N$

Friction force calculation (Ff):

We have the formula to calculate the friction force:

Ff = μk * N Equation (3)

μk kinetic coefficient of friction

We know that μk = 0.373and N= 21854N ,then:

$Ff=0.373*21854$

$Ff=8151.54 N$

Calculation of the tension force in the rope (T):

Newton's Second law

$sum Fx= mc*ac$

$T-Ff=mc*ac$

$T=2230(\frac{13}{15}) + 8151.54$

T=10084,21 N

Answer: The rope must have a force of 10084,21 N

8 0

3 years ago

You have a flag pole at an angle of 45 degrees to a wall it is designed to support a max torque of 40Nm. You bought a new one wi

In-s [12.5K]

Answer:

0.915 rad or 52.44 degrees

Explanation:

Let g = 10 m/s2. We can calculate the gravity force acting on center of mass of the new 8.75 kg pole:

$F = mg = 8.75 * 10 = 87.5 kg$

The moment is the dot product of force and moment arm

$M = \vec{F} \cdot \vec{r} = Frcos\theta = 87.5*0.75cos\theta = 65.625cos\theta$

where θ is the angle between the gravity force and the pole, or between the pole and the wall. As M can be at its max, which is 40 Nm, we can solve for θ:

$62.625cos\theta = 40$

$cos\theta = 40 / 62.625 = 0.61$

$\theta = cos^{-1}0.61 = 0.915 rad = 0.915 * 180 /\pi = 52.44^o$

7 0

3 years ago

What makes the sky blue? a. reyleigh b. the sun c. the atmosphere d. the birds

Ronch [10]

The correct answer is b

4 0

3 years ago

Read 2 more answers

These waves are most harmful for living things.

scZoUnD [109]

Explanation:

G. gamma rays because they are produced by the hottest and most energetic objects in the universe, such as neutron stars and pulsars, supernova explosions, and regions around black holes.

hope this helps you

have a nice day:)

5 0

3 years ago

Learning Goal: To understand the concept of moment of inertia and how it depends on mass, radius, and mass distribution.

marshall27 [118]

Answer:

m₂ = 4 kg

Explanation:

The moment of inertia is defined by

I = ∫ r² dm

for bodies with high symmetry it is tabulated, for a spherical shell

I = 2/3 m r²

in this case the first sphere has a radius of r₁ = 2m and a mass of m₁ = 1 kg, the second sphere has a radius r₂ = 1m.

They ask what is the masses of the second spherical shell so that the moment of inertia of the two is the same.

I₁ = ⅔ m₁ r₁²

I₂ = ⅔ m₂ r₂²

They ask that the two moments have been equal

I₁ = I₂

⅔ m₁ r₁² = ⅔ m₂ r₂²

m₂ = (r₁ / r₂) ² m₁

let's calculate

m₂ = (2/1) ² 1

m₂ = 4 kg

4 0

3 years ago