The builders of the pyramids used a long ramp to lift 2-kg (20.0-ton) blocks. if a block rose 0.800 m in height while traveling 20.0 m along the ramp’s surface, how much uphill force was needed to push it up the ramp at constant velocity? use g=9.81 m/s2.

7848 N

Explanation:

Recall: K.E = P.E = Fd

K.E =

P.E = mgh

Given parameters;

mass (m) = 20000 kg

height (h) = 0.8 m

distance (d) = 20 m

g is given as 9.81

Force (F) = ?

Comparing the above parameters with the equations to find F,

We will use P.E = Fd

i.e. mgh = Fd

making F the subject of the formula

F =

substitute for m, g, h and d

F =

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

that would be because of both gravity and friction. so     c