A sample contains 24 g of a radioactive isotope. How much radioactive isotope remains in the sample after 2 half-lives?

A. 3 g

B. 6 g

C. 12 g

D. 1.5 g

The formula for average speed can best be written as

How are sound waves and electromagnetic waves different?

Which of the following is a physical quantity that has a magnitude but no direction? a. vector b. scalar c. resulant d. frame of referance

Glass marble has a volume of 5 cm and a mass of 30 g what is the density of the marbel

With an average acceleration of - 1.3 m/s2, how long will it take a cyclist to bring a bicycle with an initial speed of 13.0 m/s to a complete stop? Answer in units of s.

the acceleration of gravity is 28 times on sun than earth. Imagine there is a space suit that let you stand on sun. Calculate the weight of 100 kg person on earth in newtons

A force of 20 n acts upon a 5 kg block, calculate acceleration of the object

What resultant force is needed to accelerate a train of mass 3.41000000 kg from rest to 15.0ms in exactly 20s

I to fall in love with someone or to at least get a boyfriend

Is rain falling a contact or noncontact force