An Earthquake occurs as
A) seismic waves travel to Earth's surface.
B) energy released from Earth's interior travels to Earth's surface.
C) energy released at Earth's surface travels to Earth's interior.
D) seismic waves travel to Earth's interior.
E) energy released from Earth's interior travels in the form of seismic waves to Earth's surface.
Answer: E
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The resultant of a 40-N force at right angles to a 30-N force is
A) 30 N. B) 40 N. C) 50 N. D) greater than 50 N.
A(n) ______________ is an elementary particle with a charge of +1.6 × 10^-19 coulomb
Fill in the blank(s) with correct word
A mass attached to the end of a spring is pulled out and released on a surface with friction. The work
? done on the mass by the force exerted by the spring
A. ?has the same sign as the change in energy owing to friction during one half of each cycle. B. ?never has the same sign as the change in energy owing to friction. C. ?always has the same sign as the change in energy owing to friction. D. ?never has the same sign as the change in energy owing to friction if the force of friction is greater than the spring force. E. ?always has the same sign as the change in energy owing to friction if the force of friction is greater than the spring force.
A charged particle moves in a region of uniform magnetic field along a helical path (radius = 4.0 cm, pitch = 20 cm, period = 2.0 ms). What is the speed of the particle as it moves along this path?
A. 0.13 km/s B. 0.10 km/s C. 0.16 km/s D. 0.23 km/s E. 0.06 km/s