A block of mass m=1.0 kg is initially at rest at the bottom of a ramp of length l=10m. The ramp is tilted upwards at an angle of 30 degrees and the coefficient of kinetic friction is 0.4. The block is connected to a rope and pulley as shown in the figure. If the rope is pulled with a force of 5N, how long does it take the block to reach the top of the ramp? You can ignore static friction, but not kinetic friction.

i'm on my way to history not a mistory.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

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.

i already answered it by 34/s