Questions from Modern Physics

Q: Four astronauts are in a spherical space station. (a

Four astronauts are in a spherical space station. (a) If, as is typical, each of them breathes about 500 cm3 of air with each breath, approximately what volume of air (in cubic meters) do these astron...

Q: In Wagner’s opera Das Rheingold, the goddess Freia is ransomed for

In Wagner’s opera Das Rheingold, the goddess Freia is ransomed for a pile of gold just tall enough and wide enough to hide her from sight. Estimate the monetary value of this pile. The density of gold...

Q: How many times does a human heart beat during a person’s lifetime

How many times does a human heart beat during a person’s lifetime? How many gallons of blood does it pump? (Estimate that the heart pumps 50 cm3 of blood with each beat.)

Q: You are using water to dilute small amounts of chemicals in the

You are using water to dilute small amounts of chemicals in the laboratory, drop by drop. How many drops of water are in a 1.0-L bottle?

Q: For the vectors

For the vectors

Q: A postal employee drives a delivery truck along the route shown in

A postal employee drives a delivery truck along the route shown in Fig. E1.25. Determine the magnitude and direction of the resultant displacement by drawing a scale diagram. Fig. E1.25:

Q: A spelunker is surveying a cave. She follows a passage 180

A spelunker is surveying a cave. She follows a passage 180 m straight west, then 210 m in a direction 45° east of south, and then 280 m at 30° east of north. After a fourth displacement, she finds her...

Q: (a) Does it make sense to say that a vector

(a) Does it make sense to say that a vector is negative? Why? (b) Does it make sense to say that one vector is the negative of another? Why? Does your answer here contradict what you said in part (a)?...

Q: Compute the x- and y-components of the vectors

Compute the x- and y-components of the vectors

Q: Let u be the angle that the vector A makes with the

Let u be the angle that the vector A makes with the +x-axis, measured counter clockwise from that axis. Find angle u for a vector that has these components: (a) Ax = 2.00 m, Ay = -1.00 m; (b) Ax = 2.0...