A radioactive sample has a half-life of 10 min. What fraction of the sample is left after 40 min?
A) 1/32 B) 1/8 C) 1/2 D) 1/4 E) 1/16
Question 2
A firecracker breaks up into two pieces, one has a mass of 200 g and flies off along the x-axis with a speed of 82.0 m/s and the second has a mass of 300 g and flies off along the y-axis with a speed of 45.0 m/s.
What is the total momentum of the two pieces? A)
361 kgm/s at 56.3 from the x-axis
B)
93.5 kgm/s at 28.8 from the x-axis
C)
21.2 kgm/s at 39.5 from the x-axis
D)
361 kgm/s at 0.983 from the x-axis
E)
21.2 kgm/s at 56.3 from the x-axis
From left to right: Size development, biometrical changes in the cranium, reduction of toes ...
The small dorsal fin of this blue whale is just visible on the far left.
The Many Faces of Life (Part 2)
The path of blood flow through the chambers of the left and right side of the heart, including the v
Most vehicles will be correctly positioned when the left front tire is centered on the tire pad.