Two small objects, with masses m and M, are originally a distance r apart, and the magnitude of the gravitational force on each one is F. The masses are changed to 2m and 2M, and the distance is changed to 4r
What is the magnitude of the new gravitational force? A) F/16
B) F/4
C) 16F
D) 4F
E) F/2
B
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Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 3sin(2x)cos(5t), where x is in m and t is in s. What is the wavelength of the interfering waves?
a. 3.14 m b. 1.00 m c. 6.28 m d. 12.0 m e. 2.00 m
A square coil (length of side = 24 cm) of wire consisting of two turns is placed in a uniform magnetic field that makes an angle of 60° with the plane of the coil. If the magnitude of this field increases by 6.0 mT every 10 ms, what is the magnitude of the emf induced in the coil?
a. 55 mV b. 46 mV c. 50 mV d. 60 mV e. 35 mV
State which element is oxidized and which is reduced in the reaction Fe + Cl2? FeCl2
Tritium has a half-life of 12.3 years. How many years will elapse when the radioactivity of a tritium sample diminishes to 35% of its original value?
a. 1.2E–1 years b. 1.9E+1 years c. 4.3E+0 years d. 6.3E+1 years e. 8.1E+0 years