A particle starts from rest at xi = 0 and moves for 10 s with an acceleration of +2.0 cm/s2 . For the next 20 s, the acceleration of the particle is -1.0 cm/s2 . What is the position of the particle at the end of this motion?
a. zero
b. +3.0 m
c. -1.0 m
d. +2.0 m
e. -3.0 m
B
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When a compressive stress is applied parallel to the fibers of a composite material, cracks form at the fiber-matrix interface due to _________effect strain.
Fill in the blank(s) with the appropriate word(s).
The star Vega has an absolute magnitude of about 4 and an apparent magnitude of about 0. Based on the definitions of absolute and apparent magnitude, we can conclude that
A) Vega is nearer than 10 parsecs from Earth. B) Vega has a parallax angle of 1/10 arcsecond. C) Vega's luminosity is less than that of our Sun. D) Vega's surface temperature is cooler than the Sun.
Approximately how fast is a person located at the Earth's equator traveling due to the rotation of the Earth?
A) 1,700 km/hr B) 17 km/hr C) 17,000 km/hr D) 170 km/hr E) not moving at all
The major contribution in heating the troposphere comes from ______________
Fill in the blank(s) with correct word