A sample contains 36g of a radioactive isotope. how much radioactive isotope remains in the sample after 3 half-lives

As an object falls in a gravitational field, its speed increases. This is an example of potential energy transforming into what? A. chemical potential energy B. electrical potential energy C. elastic potential energy D. kinetic energy

An object at rest on a flat, horizontal surface explodes into two fragments, one seven times as massive as the other. the heavier fragment slides 6.70 m before stopping. how far does the lighter fragment slide?

What is the purpose of a control sample that is known to be from bighead carp in edna surveillance? a. to produce multiple banding patterns b. to amplify the dna in small samples c. to see if samples contain the target dna d.

An object's apparent motion depends on A. the object's size and characteristics. B. the observer's size and characteristics. C. the observer's frame of reference. D. the object's frame of reference.

What is kinetic energy of a 30 kg child running at 7mph

given that a car's distance from a stop sign t seconds since it started moving is represented by d=t2-2t determine the car's average speed over each interval of elapsed time

A ball hits a wall. What is true about the magnitude of the force experienced by the ball compared with the force experienced by the wall? OA. The ball experiences more force than the wall. OB. The ball experiences less force than the wall.

A swimmer jumps from a waterfall thats is 8.5 m high from the lake below. How fast must he run horizontally to dive 2.5m away from the base of the waterfall?

What happens (as far as energy goes) when a molecule of gas strikes the wall of a container?

The boom of a fire truck raises a fireman (and his equipment - total weight 280 lbf) 60 ft into the air to fight a building fire.