Mortimer pushes against a wall with a force of 10 newtons for a time of 5 seconds. How much work does Mortimer do on the wall?
A) none B) 5 J C) 50 J D) 2 J E) 10 J
A
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If the magnitude of the velocity of an object increases, we may be sure that during the time of this increase,
a. the object is accelerated. b. the acceleration of the object increases. c. the object is moving in a straight path. d. the object is changing direction. e. none of these
A plane truss composed of two steel pipes (E 5 210 GPa, d 5 100 mm, and wall thickness 5 6.5 mm) is subjected to vertical load W at joint B. Joints A and C are L 5 7 m apart. The critical value of load W for buckling in the plane of the truss is nearly:
(A) 138 kN
(B) 146 kN
(C) 153 kN
(D) 164 kN
Doppler shifted hydrogen absorption lines are seen in the spectrum of a star. The hydrogen line at 656.28 nm is seen to be shifted to 656.08 nm
How fast is the star moving (Note: The speed of light is approximately 300,000 km/s, or 3 × 105 km/s.)? A) about 10,000 km/s B) about 1,000 km/s C) about 1,000,000 km/s D) about 100 km/s
The water hole is a radio region with lower background noise
Indicate whether the statement is true or false