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3 years ago

10

In 2016 there were 2025 reported collisions between trains and cars that’s resulted in 265 fatalities. Explain the change in kin

etic energy as it relates to conservation of momentum

1 answer:

Law Incorporation [45]3 years ago

7 0

Answer B

Explanation:

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The si unit of mass is the Newton. True or false.

LUCKY_DIMON [66]

False it’s the unit of force

5 0

3 years ago

The index of refraction of silicate flint glass for red light is 1.620 and for violet light is 1.660 . A beam of white light in

chubhunter [2.5K]

Answer:

The angular separation equals $0.35^{o}$

Explanation:

We have according to Snell's law

$n_{1}sin(\theta _{1})=n_{2}sin(\theta _{2})$

$\therefore \theta _{2}=sin^{-1}(\frac{n_{1}sin(\theta _{1})}{n_{2}})$

Using this equation for both the colors separately we have

$\theta _{red}=sin^{-1}(\frac{sin(23.90^{o})}{1.62})\\\\\theta _{red}=14.48^{o}$

Similarly for violet light we have

$\theta _{violet}=sin^{-1}(\frac{sin(23.90^{o})}{1.660})\\\\\theta _{violet}=14.13^{o}$

Thus the angular separation becomes

$\Delta \theta =14.48-14.13=0.35^{o}$

6 0

4 years ago

If a car has a centripetal acceleration of 7m/s2 over a radius of 7m. How fast is it going

dangina [55]

Answer:

7 m/s (agrees with answer a in your list)

Explanation:

Recall that the centripetal acceleration is defined by the square of the tangential velocity divided by the radius of the rotational motion:

$a_c=\frac{v_t^2}{R}$

then the tangential velocity is extracted from here as:

$a_c=\frac{v_t^2}{R} \\v_t^2=a_c * R\\v_t=\sqrt{a_c * R}$

in our case, this becomes:

$v_t=\sqrt{7*7} = 7 \,\,m/s$

3 0

4 years ago

Soot particles ("black carbon aerosols" generally cause ________ of earth's atmosphere by ________ solar energy.

sineoko [7]

They cause an increase in temp of earths atmosphere or warming by absorbing solar energy. hope this helps

7 0

3 years ago

A string is stretched to a length of 308 cm and both ends are fixed. If the density of the string is 0.023 g/cm, and its tension

soldi70 [24.7K]

Answer:

Frquency=3,994Hz

Explanation:

Tension =967N

Density of string (μ)=0.023g/cm

Length of the stretched spring=308cm

Fundamental frequency for nth harmonic :

Fn=n/2L(√T/μ)

Substituting the given values to find the frequency :

f1=1/2(308cm) *(0.01m/1cm)[(√967N)/(0.023g/cm)(0.1kg)/(0.1kg/m)/(1g/cm)]

=6.16m[(√967N)/0.0023kg/m)]

=3,994.20Hz

Approximately,

The frequency will be =3,994Hz

7 0

3 years ago