Q: The density of air under standard laboratory conditions is 1.29
The density of air under standard laboratory conditions is 1.29 kg/m3, and about 20% of that air consists of oxygen. Typically, people breathe about 1/2 L of air per breath. (a) How many grams of oxyg...
See AnswerQ: The black dots at the top of Fig. Q2.2
The black dots at the top of Fig. Q2.2 represent a series of high-speed photographs of an insect flying in a straight line from left to right (in the positive x-direction). Which of the graphs in Fig....
See AnswerQ: You run due east at a constant speed of 3.00
You run due east at a constant speed of 3.00 m/s for a distance of 120.0 m and then continue running east at a constant speed of 5.00 m/s for another 120.0 m. For the total 240.0-m run, is your averag...
See AnswerQ: A rectangular piece of aluminum is 7.60 ± 0.
A rectangular piece of aluminum is 7.60 ± 0.01 cm long and 1.90 ±0.01 cm wide. (a) Find the area of the rectangle and the uncertainty in the area. (b) Verify that the fractional uncertainty in the are...
See AnswerQ: As you eat your way through a bag of chocolate chip cookies
As you eat your way through a bag of chocolate chip cookies, you observe that each cookie is a circular disk with a diameter of 8.50 ± 0.02 cm and a thickness of 0.050 ± 0.005 cm. (a) Find the average...
See AnswerQ: Biological tissues are typically made up of 98% water. Given
Biological tissues are typically made up of 98% water. Given that the density of water is 1.0 × 103 kg/m3, estimate the mass of (a) the heart of an adult human; (b) a cell with a diameter of 0.5 mm; (...
See AnswerQ: Two ropes in a vertical plane exert equal-magnitude forces on
Two ropes in a vertical plane exert equal-magnitude forces on a hanging weight but pull with an angle of 72.0° between them. What pull does each rope exert if their resultant pull is 372 N directly up...
See AnswerQ: Two workers pull horizontally on a heavy box, but one pulls
Two workers pull horizontally on a heavy box, but one pulls twice as hard as the other. The larger pull is directed at 21.0° west of north, and the resultant of these two pulls is 460.0 N directly nor...
See AnswerQ: Three horizontal ropes pull on a large stone stuck in the ground
Three horizontal ropes pull on a large stone stuck in the ground, producing the vector forces
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