Need with science!
which of the following statements about radioactive decay is true?
a. radioactive decay is the rate at which new atoms form.
b. during radioactive decay, atoms break down, releasing, particles or energy.
c. the rate of decay of a radioactive element cannot be approximated.
d. the number of radioactive atoms in a sample will always remain constant.

which of the following terms refers to the time it takes for one-half of the radioactive atoms in a sample of a radioactive element to decay?
a. relative age.
b. absolute age.
c. potassium-argon date
d. half-life

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?

Which is not an example of how an object gains elastic potential energy by stretching? a. jumping on a pogo stick b. pulling on a rubber band c. jumping on a trampoline