Questions from College Physics

Q: Platelet cells in blood play an essential role in the formation of

Platelet cells in blood play an essential role in the formation of clots and exist in normal human blood at the level of about 200 000 per cubic millimeter. In order to illustrate that diffusion alone...

Q: Ten students take a test and get the following scores: 83

Ten students take a test and get the following scores: 83, 62, 81, 77, 68, 92, 88, 83, 72, and 75. What are the average value, the rms value, and the most probable value, respectively, of these test s...

Q: In plants, water diffuses out through small openings known as stomatal

In plants, water diffuses out through small openings known as stomatal pores. If D = 2.4 × 10−5 m2/s for water vapor in air, and the length of the pores is 2.5 × 10−5 m, how long does it take for a wa...

Q: A hand pump is being used to inflate a bicycle tire that

A hand pump is being used to inflate a bicycle tire that has a gauge pressure of 40.0 lb/in2. If the pump is a cylinder of length 18.0 in. with a cross-sectional area of 3.00 in.2, how far down must t...

Q: What mass of water at 25.0°C added to

What mass of water at 25.0°C added to a Styrofoam cup containing two 50.0 g ice cubes from a freezer at −15.0°C will result in a final temperature of 5.0°C for the drink?

Q: A wall consists of a layer of wood outside and a layer

A wall consists of a layer of wood outside and a layer of insulation inside. The temperatures inside and outside the wall are +22°C and −18°C; the temperature at the wood/insulation boundary is −8.0°C...

Q: A sperm whale can reach depths of 2500 m below the surface

A sperm whale can reach depths of 2500 m below the surface of the ocean. What is the pressure on the whale’s skin at that depth, assuming that the density of seawater is constant from the surface to t...

Q: Imagine a trip where you drive along an east-west highway

Imagine a trip where you drive along an east-west highway at 80.0 km/h for 45.0 min and then you turn onto a highway that runs 38.0° north of east and travel at 60.0 km/h for 30.0 min. (a) What is yo...

Q: A flywheel (a massive disk) rotates with constant angular acceleration

A flywheel (a massive disk) rotates with constant angular acceleration. For a point on the rim of the flywheel, is the tangential acceleration component constant? Is the radial acceleration component...

Q: Tina is going to make iced tea by first brewing hot tea

Tina is going to make iced tea by first brewing hot tea, then adding ice until the tea cools. How much ice, at a temperature of −10.0°C, should be added to a 2.00 × 10−4 m3 glass of tea at 95.0°C to c...