Asemi-trailer is coasting downhill along a mountain highway when its brakes fail. the driver pulls onto a runaway truck ramp that is inclined at an angle of 17.0° above the horizontal. the semi-trailer coasts to a stop after traveling 160 m along the ramp. what was the truck's initial speed?

The velocity is 30.279 m/s

Explanation:

Consider the initial speed of the semi-trailer be v

Then, initial kinetic energy =

According to question, the semi-trailer coast along a ramp, which is inclined at an angle of 170, and to a distance of 160m to stop

Change in vertical position == 46.779m

Final potential energy of semitrailer = mgh

Applying principle of conservation of energy,

= mgh

Solving for v, we get = 2gh = 2*9.8*46.779 = 916.8684

= 916.8684

v = 30.279 m/s

Therefore, the velocity is 30.279 m/s

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.