Jim measures the count rate of a sample of americium-241 as 120cpm. Roughly how long would it take for the count rate to fall below 4 cpm. Show your working

What is the general term for a rock fragment present in a sedimentary rock?

A light bulb does 100 joules of work in 2.5 seconds. how much work power dos it have

Cho is using technological design to build a clock based on the apparent motion of the Sun. Which of the following would be the best measure of success for Cho's clock? A. Cho's clock works even at night. B.

The potential energy U of an object of mass m that is separated by a distance R from an object of mass M is given by U = - GMm/R. What is the kinetic energy K of the satellite? Express your answer in terms of the potential energy.

Which type of seismic wave does not travel through liquid? A. L waves B. P waves C. S waves D. Surface waves

Find the momentum of a 25 kg remote controlled car moving 4.0 m/s (Type your answer below, don't forget your significant figures and units!)

When a wave slows down it ... a. bends away from the normal b. bends towards the normal c. continues in a straight line

Select the statement that best describes how the forces relate. A. The object on which they are acting and the distance to that object determines the amount of force. B.

A block with m = 300 grams oscillates at the end of a linear spring with k = 6.5 N/m. (assume this is a top-down view and the block is sliding on a frinctionless surface;

What changes would a cold front bring to an area with warm, dry weather? extended period of rain or snow several days of gray skies dry air and sunny skies rain or thunderstorms