Adam holds back a lake that is 85m deep at the dam. if the lake is 20km long, how much thicker should the dam be if the lake were smaller, only 1.0km long?

What happens to light waves from a star as the star moves away from earth?

How many seconds does it take a pebble released from rest off a bridge to fall 29.4 m ? what is the pebble's speed when it has fallen 29.4 m ?

Calculate the first and second velocities of the car with four washers attached to the pulley, using the formulas v1 = 0.25 m / t1 , and v2 = 0.25 m / (t2 – t1) where t1 and t2 are the average times the car took to reach the 0.25 and the 0.50 meter marks. record these velocities, to two decimal places, in table e.