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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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
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
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