A swimmer heading directly across a river that is 200 m wide reaches the opposite bank in 6 min 40 s. During this swim, she is swept downstream 480 m. What is the speed of the current?
A) 0.50 m/s
B) 0.80 m/s
C) 1.2 m/s
D) 1.4 m/s
E) 1.8 m/s
C
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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) 3600 V/m B) 1000 V/m C) 2000 V/m D) 60 V/m E) 500 V/m
Some anthropological evidence for the precession of Earth's tilt is that the passage into the Great Pyramid in Egypt points at the star Thuban, which was the polestar about 6,000 years ago.
Answer the following statement true (T) or false (F)
Which of the following represents the maximum value of the magnetic field at a distance of 2.5 m from a 100 W light bulb?
A) 0.10 ?T B) 0.40 ?T C) 0.50 ?T D) 0.60 ?T E) 0.80 ?T
If a new wave arrives on shore every two seconds, then its frequency is 2 Hz
Indicate whether the statement is true or false