Why isn’t the radiometric dating of sedimentary rock exact? Because sedimentary rock only contains carbon-14 and no other radioactive isotopes. Because sedimentary rock only forms where there were ancient seas. Because sedimentary rock is constructed of many different layers. Because sedimentary rock is made up of weathered and eroded bits of igneous rock.

A23 kg log of wood begins from rest, 300 m up a sluice (a water track used to transport logs, think of it as an inclined plane with negligible friction) inclined at 20° to the horizontal. after it reaches the flat waterway at the bottom it collides elastically with a 100 kg block of wood initially at rest near the base of the incline. (a) how long does it take the 23 kg log to travel down the incline? (b) what is the speed of the 23 kg log at the bottom of the incline? (c) what are the velocities of both blocks of wood after the collision? (d) what is the total kinetic energy before the collision? (e) what is the kinetic energy of the 23 kg log after the collision? (f) what is the kinetic energy of the 100 kg block of wood after the collision? (g) what is the total kinetic energy after the collision? (h) compare the total initial and total final kinetic energies. is this consistent with what you would expect for elastic collisions? explain!

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

What is the measure of how much matter is in an object and that can be measured using a balance? a. height b. volume c. weight d. mass