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

Physics & Space Science

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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.

Physics & Space Science

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.

Physics & Space Science

Calculate the percentage composition by mass (to the nearest 0.1) of each element in aspirin, C9H8O4

Physics & Space Science

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

Physics & Space Science