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fenix001 [56]
3 years ago
14

a 1.2x10^3 kilogram car is accelerated uniformly from 10. meters per second to 20 meters per second in 5.0 seconds. what is the

magnitude of the net force acting on the car during this 5.0 second interval
Physics
1 answer:
irinina [24]3 years ago
7 0
Force , F = ma

F =  m(v - u)/t               

Where m = mass in kg, v= final velocity in m/s, u = initial velocity in m/s
t = time, Force is in Newton.

m= 1.2*10³ kg,  u = 10 m/s,  v = 20 m/s, t = 5s

F =  1.2*10³(20 - 10)/5

F = 2.4*10³ N = 2400 N


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Three liquids that will not mix are poured into a cylindrical container. The volumes and densities of the liquids are 0.50 L, 2.
Vladimir79 [104]

Answer:

The force is  F = 18.33 \  N

Explanation:

From the question we are told that

    The number of liquids is  n =  3

      The volume of the first liquid is V_1 = 0.50 L = 0.0005 \  m^3

      The density of the first liquid is  \rho_1  =   2.6 \ g/cm^3

      The volume of the second  liquid is V_2 = 0.25 L = 250\  cm^3

      The density of the second liquid is  \rho_2  =  1.0 \ g/cm^3

      The volume of the third  liquid is V_3 = 0.40 L = 400\  cm^3

      The density of the  third  liquid is  \rho_3  =  0.80 \ g/cm^3

Generally the force at the bottom of the container is mathematically represented  as

    F = m_t *  g

Here g = 980.665  \ cm/s^2

Here  m_t  is the total mass of all the liquid which is mathematically represented as

             m_t = ( V_1 *  \rho_1 )+ ( V_2 *  \rho_2)+ ( V_3 *  \rho_3)

=>         m_t = ( 500 *  2.6)+ ( 250 *  1.0 )+ ( 400  *  0.80 )

=>         m_t = 1870 \  g

So

       F = 1870  *  980.66

=>   F = 1833843.55 \ g \cdot cm /s^2

=>    F = 1833843.55 \ g \cdot cm /s^2 =  \frac{1833843.55}{1000 * 100} kg \cdot m /s^2

=>    F = 18.33 \  N

5 0
3 years ago
During an auto accident, the vehicle's airbags deploy and slow down the passengers more gently than if they had hit the windshie
NemiM [27]

Answer:

0.38 m

Explanation:

As we know that the person due to the airbag action, comes to a complete stop, in a time of 36 msec or less, and during this interval, is decelerated at a constant rate of 60 g, we can find the initial velocity (when airbag starts to work), as follows:

vf = v₀ -a*t  

If vf = 0, we can solve for v₀:

v₀ = a*t = 60*9.8 m/s²*36*10⁻³s = 21.2 m/s

With these values of v₀, a and t, we can find Δx, applying any kinematic equation that relates these parameters with the displacement.

Just for simplicity, we can use the following equation:

 vf^{2} - vo^{2} =2*a*d

where vf=0, v₀ =21.2 m/s and a= -588 m/s².

Solving for d:

 d =\frac{21.2 m/s}{588 m/s2} = 0.38 m

⇒ d = 0.38 m

5 0
3 years ago
Directions:
Cloud [144]

Answer:

the answer is shlaboobo

Explanation:

i donfjjajmnxvvxbb cbb  xhsuuss

8 0
3 years ago
Does melting change substances into other substances?
spayn [35]

Answer:

Yes, I think

Explanation:

Melting is a process that causes a substance to change from a solid to a liquid. Melting occurs when the molecules of a solid speed up enough that the motion overcomes the attractions so that the molecules can move past each other as a liquid.

4 0
3 years ago
Read 2 more answers
When Anna eats an apple, the sugars in that apple are broken down into the substance called glucose. Glucose is then burned in h
Alex777 [14]

Answer:

Chemical energy is converted to thermal energy and electrical energy.

Explanation:

The sugar present in the apple is broken down into Glucose. This is chemical energy stored in the apple which is broken down into energy which is utilized by body for everyday works. The chemical energy gets converted to thermal energy which warms the body and electrical energy due to which the heart beats.

7 0
4 years ago
Read 2 more answers
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