Two people stand on different floors of an outdoor stairway. One is 6 m above the ground and the other is 12 m above the ground. The person on the lower floor throws a ball upward with a speed of 15 m/s and the other person just drops hers. Ignoring air resistance, which ball hits the ground at a higher speed?
A. The one thrown upward
B. They both hit the ground with the same speed
C. The one that is dropped
Answer: A
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Kinetic energy is definitely conserved
Indicate whether the statement is true or false
If the tension, in figure below
, is 15 N and the magnitude of the acceleration, a, is 3.0 m/s2, what is the mass, m, of the suspended object? Assume that all surfaces and the pulley are frictionless.
?
a.
3.1 kg
b.
2.5 kg
c.
2.8 kg
d.
2.2 kg
e.
3.7 kg
"GFI" stands for:
a. grand flux indicator. b. ground forcing indicator. c. ground fault interrupter. d. gauss-free invention.
A composite beam of aluminum (Ea 5 72 GPa) and steel (Es 5 190 GPa) has a width b 5 25 mm and heights ha 5 42 mm and hs 5 68 mm, respectively. A bending moment is applied about the z axis resulting in a maximum stress in the aluminum of 55 MPa. The maximum stress in the steel is approximately:
(A) 86 MPa
(B) 90 MPa
(C) 94 MPa
(D) 98 MPa