A sample contains 10 g of a radioactive isotope. How much radioactive isotope will remain in the sample after 2 half-lives?

A. 7.5 g

B. 5.0 g

C. 2.5 g

D. 10.0 g

A 15 kg bowling ball has a velocity of 2.6 m/s what is the momentum?

Which of these new forms of energy projects will require a hydrologist as an important person on the team for developing the project? A. a waste-to-energy project B. a tidal turbine project C. an algal biofuel project D.

When you are running, there is friction between your feet and the ground and air resistance between your body and the air.

What branch of physics best explains the photoelectric effect? A.) nature of light B.) general relativity C.) law of conservation of momentum D.) thermodynamics

Every 10 seconds a pendulum makes 2 cycles. What are the period and frequency of this pendulum

When distances were carefully measured from Earth to globular clusters above and below the Milky Way plane (where our view of them is not obscured by interstellar dust and gas), their distribution was found to be

Imagine you transfer heat into a gas. This heat splits up in two different ways: Additional thermal energy making the gas hotter and "fuel" for the gas to do work. Let's suppose, 64% of the transferred heat transforms into thermal energy.

How much heat is absorbed by a 61g iron skillet when its temperature rises from 5oC to 29oC?

Explain the relationship between motion and frame of reference.

Two students are looking at a brightly lit full Moon, illuminated by the reflected light from the Sun. Consider thefollowing discussion between the two students about what the spectrum of moonlight would look like.