Questions from College Physics

Q: Imagine a person standing naked in a room at 23.0

Imagine a person standing naked in a room at 23.0°C. The walls are well insulated, so they also are at 23.0°C. The person's surface area is 2.20 m2, and his basal metabolic rate is 2167 kcal/day. His...

Q: Aliens from the planet Jeenkah have based their temperature scale on the

Aliens from the planet Jeenkah have based their temperature scale on the boiling and freezing temperatures of ethyl alcohol. These temperatures are 78°C and −114°C, respectively. The people of Jeenkah...

Q: Show, from XC = 1/(ωC), that the units

Show, from XC = 1/(ωC), that the units of capacitive reactance are ohms.

Q: Two gears A and B are turning in mesh. Gear A’s

Two gears A and B are turning in mesh. Gear A’s radius to the point of contact between the gears is 8.0 cm and that of gear B is 4.0 cm. (a) What is the linear speed of the contact p...

Q: Atmospheric pressure is about 1.0 × 105 Pa on average

Atmospheric pressure is about 1.0 × 105 Pa on average. (a) What is the downward force of the air on a desktop with surface area 1.0 m2? (b) Convert this force to pounds to help others understand how...

Q: Telescopes used in astronomy have large lenses (or mirrors). One

Telescopes used in astronomy have large lenses (or mirrors). One reason is to let a lot of light in—important for seeing faint astronomical bodies. Can you think of another reason why it is an advanta...

Q: What is the maximum possible value of the angular momentum for an

What is the maximum possible value of the angular momentum for an outer electron in the ground state of a bromine atom?

Q: The inside of a cell membrane is at a potential of 90

The inside of a cell membrane is at a potential of 90.0 mV lower than the outside. How much work does the electric field do when a sodium ion (Na+) with a charge of +e moves through the membrane from...

Q: Find the height h of the pits on a CD (Fig

Find the height h of the pits on a CD (Fig. 25.6a). When the laser beam reflects partly from a pit and partly from land (the flat aluminum surface) on either side of the pit, the two reflected beams i...

Q: At a point due north of the transmitter, how should a

At a point due north of the transmitter, how should a second ipole antenna be oriented to serve as a receiver?