A projectile is launched from ground level at an angle of 70.0° above horizontal with a speed of 50.0 m/s. If the projectile is moving over level ground, how far way from the launch position does it contact the ground?
A)
164 m
B)
54.2 m
C)
203 m
D)
102 m
E)
12.4 m
A
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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
One aspect of a hybrid page layout may be to set a maximum screen width at which the webpage displays.
Answer the following statement true (T) or false (F)
To determine the height of a flagpole, Abby throws a ball straight up and times it. She sees that the ball goes by the top of the pole after 0.5 s and then reaches the top of the pole again after a total elapsed time of 4.1 s
How high is the pole above the point where the ball was launched? A) 10 m B) 13 m C) 16 m D) 18 m E) 26 m
Strictly speaking, if a beam of white light is shone through a piece of very thick glass, the first color to emerge from the other side is
1) white. 2) violet. 3) red. 4) green. This is because 5) all frequencies travel at c. 6) lower frequencies undergo more refraction in a medium. 7) higher frequencies of light travel at a faster average speed through a medium. 8) higher frequencies of light interact with more molecules in a medium.