About how long does it take a spacecraft to go from Earth to Jupiter?
a. a week
b. a month
c. a year
d. several years
e. several decades
Answer : d. several years
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Motion of the plates of Earth's crust is thought to be due to
a. the solar wind. b. convection from the hot interior. c. tides in the oceans. d. friction between wind and the land surface. e. Earth's magnetic field.
At the Fermilab accelerator in Weston, Illinois, singly-charged ions with momentum 3.3 × 10^?16 kg?m/s are held in a circular orbit of radius 1.00 km by an upward magnetic field. What B field must be used to maintain the ions in this orbit? (qion = 1.60 × 10^?19 C)
a. 5.3 T b. 2.1 T c. 2.1 T d. 0.19 T e. 0.48 T
Charged particles from the Sun enter Earth's atmosphere close to the magnetic poles and cause
a. global cooling. b. global warming. c. auroras. d. ozone depletion.
If the current increases in a solenoid, the induced emf acts to
A) decrease the flux. B) increase the flux. C) first increase then decrease the flux. D) first decrease then increase the flux. E) have no effect on the flux.