The flow rate of blood through the average human aorta, of radius 0.95 cm, is about 90 cm3/s. What is the speed of the blood flow through the aorta?
a. 14 cm/s
b. 32 cm/s
c. 37 cm/s
d. 32 cm/s
d
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If a hydrogen atom in the ground state absorbs a 20.0 eV photon, what kinetic energy of the electron results?
A. this cannot happen B. 20.0 eV C. 13.6 eV D. 6.40 eV E. 33.6 eV
Which one of the following sets of characteristics describes the image formed by a plane mirror?
A) real and inverted B) real and upright C) virtual and upright D) virtual and inverted E) virtual and larger than the object
Which of the following is a drawback of using type Ia supernovae for measuring the distance of galaxies?
A) They are not bright enough to be noticed. B) They cannot be calibrated. C) They are a rare occurrence. D) They occur only in spiral galaxies.
Force on a Moving Charge: An electron moves with a speed of 5.0 × 104 m/s perpendicular to a uniform magnetic field of magnitude 0.20 T. What is the magnitude of the magnetic force on the electron? (e = 1.60 × 10-19 C)
A. 4.4 × 10-14 N B. 1.6 × 10-15 N C. 5 × 10-20 N D. 2.6 × 10-24 N E. zero