Questions from Modern Physics

Q: A demonstration gyroscope wheel is constructed by removing the tire from a

A demonstration gyroscope wheel is constructed by removing the tire from a bicycle wheel 0.650 m in diameter, wrapping lead wire around the rim, and taping it in place. The shaft projects 0.200 m at e...

Q: An angler hangs a 4.50-kg fish from a

An angler hangs a 4.50-kg fish from a vertical steel wire 1.50 m long and 5.00 × 10-3 cm2 in cross-sectional area. The upper end of the wire is securely fastened to a support. (a) Calculate the amount...

Q: On a part-time job, you are asked to bring

On a part-time job, you are asked to bring a cylindrical iron rod of length 85.8 cm and diameter 2.85 cm from a storage room to a machinist. Will you need a cart? (To answer, calculate the weight of t...

Q: (a) Calculate the difference in blood pressure between the feet

(a) Calculate the difference in blood pressure between the feet and top of the head for a person who is 1.65 m tall. (b) Consider a cylindrical segment of a blood vessel 2.00 cm long and 1.50 mm in di...

Q: In intravenous feeding, a needle is inserted in a vein in

In intravenous feeding, a needle is inserted in a vein in the patient’s arm and a tube leads from the needle to a reservoir of fluid (density 1050 kg/m3) located at height h above the arm. The top of...

Q: A barrel contains a 0.120-m layer of oil

A barrel contains a 0.120-m layer of oil floating on water that is 0.250 m deep. The density of the oil is 600 kg/m3. (a) What is the gauge pressure at the oil–water interface? (b) What is the gauge p...

Q: (a) What is the difference between the pressure of the

(a) What is the difference between the pressure of the blood in your brain when you stand on your head and the pressure when you stand on your feet? Assume that you are 1.85 m tall. The density of blo...

Q: a. How much time does it take light to travel from

a. How much time does it take light to travel from the moon to the earth, a distance of 384,000 km? b. Light from the star Sirius takes 8.61 years to reach the earth. What is the distance from earth...

Q: The electric field of a sinusoidal electromagnetic wave obeys the equation E

The electric field of a sinusoidal electromagnetic wave obeys the equation E =(375 V/m) cos[(1.99 * 107 rad/m)x + (5.97 * 1015 rad/s)t]. a. What is the speed of the wave? b. What are the amplitudes o...

Q: Optical fibers are constructed with a cylindrical core surrounded by a sheath

Optical fibers are constructed with a cylindrical core surrounded by a sheath of cladding material. Common materials used are pure silica (n2 = 1.450) for the cladding and silica doped with germanium...