A vertical wire carries a current straight up in a region where the magnetic field vector points due North. What is the direction of the resulting force on this current?
A) North
B) downward
C) East
D) West
E) South
D
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A solar mass star will evolve off the main sequence when
A) it completely runs out of hydrogen. B) it expels a planetary nebula to cool off and release radiation. C) it explodes as a violent nova. D) it builds up a core of inert helium. E) it loses all its neutrinos, so fusion must cease.
Which of the following changes would increase the separation between the bright fringes in the diffraction pattern formed by a diffraction grating?
A) Immerse the apparatus in water. B) Increase the wavelength of the light used. C) Increase the separation between the slits. D) All of these. E) None of these.
Calculate the percentage composition by mass (to the nearest 0.1) of each element in aspirin, C9H8O4
A 10-kg object is dropped from rest. After falling a distance of 50 m, it has a speed of 26 m/s. What is the change in mechanical energy caused by the dissipative (air) resistive force on the object during this descent?
a. ?1.3 kJ b. ?1.5 kJ c. ?1.8 kJ d. ?2.0 kJ e. ?2.3 kJ