A2.0 kg bird lands on a 1.0 x 10^1 kg bit of tree bark sitting on a frictionless ice-covered pond. the bird’s initial horizontal speed is 6.0 m/s. what is the final speed of the bird and bark?

Here in this type of question we can use momentum conservation

It is because we can see there is no external force on the system

So we can use momentum conservation principle

here we know that

now after bird sits on it then final speed of the both will be same

so final speed will be 1 m/s

b.transmitters send radio waves, and receivers capture radio waves.

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered