A 4-kg mass moving with speed 2 m/s, and a 2-kg mass moving with a speed of 4 m/s, are gliding over a horizontal frictionless surface
Both objects encounter the same horizontal force, which directly opposes their motion, and are brought to rest by it. Which statement correctly describes the situation? A) Both masses travel the same distance before stopping.
B) The 2-kg mass travels twice as far as the 4-kg mass before stopping.
C) The 2-kg mass travels farther, but not necessarily twice as far.
D) The 4-kg mass travels twice as far as the 2-kg mass before stopping.
E) The 4-kg mass loses more kinetic energy than the 2-kg mass.
B
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The design of a part that operates at temperatures up to 150°C (302°F) requires a material that is of low density and corrosion resistant. The stresses on the part are up to 50 MPa (7250psi), and it is required to be able to recycle the material. Which of the following materials might be appropriate?
(a) PE (b) A magnesium alloy (c) Epoxy (d) PEEK
The process occurring when photons bounce off a polished surface is called:
A) diffraction. B) refraction. C) reflection. D) dispersion. E) interference.
The focal lengths of the objective and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively. An object is placed at 0.30 cm
from the objective lens and the image of this object is viewed with the eyepiece adjusted for minimum eyestrain (with the eye focused at the far point). The near point of the person using the microscope is 25 cm and the far point is at infinity. What is the final overall magnification of the microscope? A) -190 x B) -240 x C) -300 x D) -320 x E) -470 x
A river or small stream that curves back and forth across its valley is
What will be an ideal response?