Jane slides a 800kg piano across the carpet with a coefficient of friction of 0.4. what is the magnitude of the force of friction acting on the piano?

Sublimation- which change of state is shown in model

When seismic waves hit a fault, the waves are reflected off the fault. seismograph can detect these reflected seismic waves. geologists then use these data to map the fault's length and depth

The answer is three because it just is