The approximate size of an atom is
a. 10-6 m.
b. 10-8 m.
c. 10-10 m.
d. 10-12 m.
e. 10-14 m.
C
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A 0.200-kg aluminum plate, initially at 20°C, slides down a 13.0-m-long surface, inclined at a 25.0° angle to the horizontal. The force of kinetic friction exactly balances the component of gravity down the plane so that the plate, once started, glides down at constant velocity. If 90% of the mechanical energy of the system is absorbed by the aluminum, what is its temperature increase at the
bottom of the incline? (Specific heat for aluminum is 900 J/kg/°C.) a. 0.115 C° b. 0.0538 C° c. 0.269 C° d. 0.78 C° e. 48.5 C°
What is meant by a heat flow line?
What will be an ideal response?
Size of the Nucleus: Estimate the mass of a nucleus with radius 2.8 ×10-15 m. (1 u = 1.6605 × 10-27 kg)
A. about 2.1 × 10-26 kg B. about 7.5 × 10-27 kg C. about 2.3 × 10-26 kg D. about 4.7 × 10-26 kg
The direction of a magnetic field at a point can be determined by
a. a generator b. a compass c. a transformer d. electromagnetic induction e. none of the above