What is the total mass of the Earth's atmosphere? (The radius of the Earth is 6.4 × 10^6 m, and atmospheric pressure at the surface is 105 N/m2.)
a. 5 × 10^16 kg
c. 5 × 10^18 kg
b. 1 × 10^18 kg
d. 1 × 10^20 kg
C
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Parallel-Plate Capacitor: The potential difference between the plates of an ideal air-filled parallel-plate capacitor with a plate separation of 6.0 cm is 60 V. What is the strength of the electric field between the plates of this capacitor?
A. 60 V/m B. 500 V/m C. 1000 V/m D. 2000 V/m E. 3600 V/m
What type of galaxy was observed by Tully and Fisher?
A baseball leaves the bat with a speed of 47 m/s and an angle of 45° above the horizontal. A 5.0-m-high fence is located at a horizontal distance of 137 m from the point where the ball is struck. Assuming the ball leaves the bat 1.0 m above ground level, by how much does the ball clear the fence?
a. 59.7 m b. 47.7 m c. 49.7 m d. 121 m
Which best describes the proper time interval between two events?
A. the longest interval measured by any inertial observer B. the interval measured in the reference frame in which the two events occur a maximum distance from each other C. the interval measured in a reference frame in which the two events are simultaneous D. the interval measured in a reference frame in which the two events occur at the same place E. None of these choices are correct