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scZoUnD [109]
4 years ago
9

A student pushes a 12.0 kg box with a horizontal force of 20 N. The friction force on the box is 9.0 N. Which of the following i

s the best approximation of the box’s acceleration?
Physics
2 answers:
antiseptic1488 [7]4 years ago
8 0
Fnet=m*a
a= Fnet/m

a=(20N[E]+9.0N[E])/ 12.0kg

a=2.4167m/s^2

a ≈ 2.4m/s^2
wariber [46]4 years ago
5 0

Answer:

The acceleration of the box its 0,91 m/s²

Explanation:

According to <em>Newton</em> first law, the force applyed to some object its equal to the mass of the object plus the acceleration of the same object.

   F=m.a ; clearing the acceleration of the equation ⇒ a=F/m

  Now in the problem its apeared the friction force and according to de phsysics definition its a force thats its against of movement.

  So the force its going to be equal to F= 20N - 9N.

 <u>Replacing in the equation</u> a=(20N - 9N)/12kg.

 <u>Solving</u> ⇒ a ≅0, 91 m/s²

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stepan [7]

Answer:

Im pretty sure its B

Thermal to chemical

6 0
3 years ago
A projectile is fired at an upward angle of 35.6° from the top of a 208-m-high cliff with a speed of 170-m/s. What will be its s
sdas [7]

Answer:

Final velocity is 181.61 m/s at angle 40.44° below horizontal.

Explanation:

Initial horizontal velocity = 170 cos 35.6 = 138.23 m/s

Final horizontal velocity = 138.23 m/s

Considering vertical motion of projectile:

Initial vertical velocity, u = 170 sin 35.6 = 98.96 m/s

Acceleration, a = -9.81 m/s²

Displacement, s = -208 m

We have v² = u² + 2as

Substituting

             v² = 98.96² + 2 x -9.81 x -208

             v = 117.79 m/s

Final velocity,

            v=\sqrt{138.23^2+117.79^2}=181.61m/s

            \theta =tan^{-1}\left ( \frac{117.79}{138.23}\right )=40.44^0

Final velocity is 181.61 m/s at angle 40.44° below horizontal.

5 0
4 years ago
The friends start by discussing what they know with respect to electric and magnetic fields. Alexa mentions several differences
Sveta_85 [38]

Answer:

A. "The electric force vector is along the direction of the electric field, whereas the magnetic force vector is perpendicular to the magnetic field."

D. "The kinetic energy of a charged particle moving in an electric field is not altered, whereas the kinetic energy of a charged particle moving in a magnetic field is either increased or decreased, depending on the direction of motion."

Explanation:

Electric fields originate from voltage differences, the higher the voltage, the stronger the resulting field. Magnetic fields originate from electric currents, a stronger current results in a stronger field. An electric field exists even if there is no current. When there is current, the magnitude of the magnetic field will change with power consumption, but the strength of the electric field will remain the same.

8 0
3 years ago
The correct formula for copper (I) bromide is —
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Answer:

The correct formula is the first one.

Explanation:

Copper has two valences I and II, in this example, it's mentioned that copper's valence is I.

Then we have to look in all the formulas for one formula where copper has that valence, and that valence is in formula 1 and 3. Number 4 is discarted that formula is incorrect, that formula doesn't exist.

Number 2 is also discarted because in this formula Cu has a valence of 2.

Number three is discarted because here Bromide has a valence of 2 and that is incorrect, Bromide's valence is 1.

8 0
3 years ago
A mass of 5 kg slides across a frictionless table with an initial velocity of 10 m/s. The wind
goldfiish [28.3K]

Answer:

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i have the same textbookkkkll

6 0
3 years ago
Read 2 more answers
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