A mass attached to a spring vibrates back and forth. At maximum displacement,
A) velocity reaches zero.
B) acceleration reaches a maximum.
C) net force reaches a maximum.
D) velocity reaches a maximum.
Ans: B) acceleration reaches a maximum.
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A uniform 120-lb beam is supported in a horizontal position by a pin and cable as shown in the figure. What is the magnitude of the force by the pin on the beam?
a.
94 lb
b.
88 lb
c.
63 lb
d.
75 lb
e.
150 lb
Consider a particle with mass m. As its speed approaches the speed of light, its relativistic momentum magnitude
approaches:
A. infinity B. mc C. m D. zero
The angles of incidence and reflection
a. are not related. b. can never be equal. c. are measured from a normal to the reflecting surface. d. add to 90°.
Determine the molar analysis of standard air (79% N2, 20% O2, and 1% argon, by volume) with 100 ppm of radon gas at 101 kPa, 20ºC.
What will be an ideal response?