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3 years ago

The belief that race indicates certain traits and capacities and that one's own race is superior is called __________.

Physics

2 answers:

o-na [289]3 years ago

4 0

Answer:Racism

Explanation:

PolarNik [594]3 years ago

4 0

Racism
Explanation: it’s the only answer that has to do with race

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Determine the kinetic energy of a 3.2 kg roller coaster car that is moving with a speed of 15.6 m/s.

Alex Ar [27]

Answer:389.4 joules

Explanation:

kinetic energy=ke

Mass=m=3.2kg

Velocity=v=15.6 m/s

Ke=(m x v x v)/2

ke=(3.2 x 15.6 x 15.6)/2

Ke=778.752/2

Ke=389.4

Kinetic energy is 389.4 joules

6 0

4 years ago

A 24000- railroad freight car collides with a stationary caboose car. They couple together, and 22 percent of the initial kineti

Klio2033 [76]

Answer:

$m_{c} = 6768\,kg$

Explanation:

According to the Principle of Energy Conservation and the Work-Energy Theorem, the system is modelled as follows:

$K_{o} = K_{f} + W_{loss}$ , where $\frac{K_{f}}{K_{o}} = 0.78$ .

Then,

$K_{f} = 0.78\cdot K_{o}$

$0.5\cdot (m_{f}+m_{c})\cdot v_{f}^{2} = 0.39\cdot m_{f}\cdot v_{o}^{2}$

Besides, the Principle of Momentum Conservation describes the following model:

$m_{f}\cdot v_{o} = (m_{f}+m_{c})\cdot v_{f}$

The final velocity of the system is:

$v_{f} = \frac{m_{f}}{m_{f}+m_{c}}\cdot v_{o}$

After substituting in the energy expression:

$0.5\cdot \frac{m_{f}^{2}}{m_{f}+m_{c}}\cdot v_{o}^{2} = 0.39\cdot m_{f}\cdot v_{o}^{2}$

$0.5\cdot m_{f} = 0.39\cdot (m_{f}+m_{c})$

The mass of the caboose is:

$0.39\cdot m_{c} = 0.11\cdot m_{f}$

$m_{c} = 0.282\cdot m_{f}$

$m_{c} = 0.282\cdot (24000\,kg)$

$m_{c} = 6768\,kg$

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4 years ago

Rama's weight is 40kg. She is carrying a load of 20 kg up to a height of 20 m . What work does she do?

Sliva [168]

Answer:

$\huge\star{\underline{\mathtt{\blue{Answer}}}}\huge\star$ ...

$\huge\boxed{\fcolorbox{white}{blue}{mgh=4000}}$

I hope this helps you......

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3 years ago

Density is a measure of an object's _____ per unit _____.

MAXImum [283]

Mass per unit volume i hope it helps

6 0

4 years ago

If a race car wants to change its velocity then a net force is required to cause the necessary

pashok25 [27]

Answer:acceleration

Explanation:

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4 years ago