Stepping barefoot off a rug onto a hardwood floor makes your feet feel cold. Why?
a. The hardwood floor is at a lower temperature than the rug.
b. The hardwood floor is at a lower temperature than your feet.
c. The hardwood floor conducts heat away from your feet better than the rug.
d. all of the above
b, c
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Impulse: A super dart of mass 20 g, traveling at 350 m/s, strikes a steel plate at an angle of 30° with the plane of the plate, as shown in the figure. It bounces off the plate at the same angle but at a speed of 320 m/s. What is the magnitude of the impulse that the plate gives to the bullet?
A. 0.52 N ? s B. 4.3 N ? s C. 300 N ? s D. 6.7 N ? s E. 0.30 N ? s
If Q = 80 nC, a = 3.0 m, and b = 4.0 m in the figure, what is the magnitude of the electric field at point P?
A. 45 N/C B. 70 N/C C. 29 N/C D. 47 N/C E. 92 N/C
A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?
a. +2.0 J b. +20 J c. ?2.0 J d. ?20 J e. +40 J
A bimetallic strip is made out of two strips of metal bonded together. Each strip is 20.0 cm long and 1.00 mm thick
One strip has a coefficient of thermal expansion 4.00 × 10-6/K and the other has a coefficient of thermal expansion 3.00 × 10-6/K. At 20.0°C the strip is straight. What is the inner radius of curvature of the composite strip at 200°C? A) 15.2 cm B) 2.22 m C) 1.27 m D) 34.8 cm E) 5.56 m