The table shows the decay in a 59 g sample of bismuth 212 overtime.

if bismuth 212 has a half-life of 60.5 seconds, how many grams of the sample will be left after 121 seconds?

A. 3.69 g
B. 7.38 g
C. 14.75 g
D. 29.5 g

Awave travels at a speed of 5.2 m/s. if the distance between crests is 0.40 m, what is the frequency of the wave? use f=v/wavelength a. 13 hz b. 2.1 hz c. 0.077 hz d. 5.6 hz

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.

Cathy is pedaling down a steep hill on her bicycle and wants to be able to coast up the next hill, which is 25 meters high, without pedaling. cathy and her bicycle have a mass of 75 kg. assuming her bicycle is 100% efficient, what would her speed have to be?