If you run a complete loop around an outdoor track (400 m) in 100 s, your average velocity is
A) 0.25 m/s.
B) 4.0 m/s.
C) 40,000 m/s.
D) zero.
E) 4.00 km/s.
D
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The speed of light in a certain medium is 2.2 × 108 m/s. What is the index of refraction of this medium?
A) 1.0 B) 1.2 C) 1.4 D) 1.6 E) 1.8
A metal sphere of radius 80. mm is charged to a potential of -0.50 kV. With what velocity must an electron be fired toward the sphere if it is to just barely reach the sphere when started from a position 15. cm from the center of the sphere?
What will be an ideal response?
A 1.9-m2 Thermopane window is constructed by using two layers of glass 4.0 mm thick, separated by an air space of 5.0 mm. If the temperature difference is 25.0 °C from the inside of the house to the outside air, what is the rate of heat flow through this window? (Thermal conductivity for glass is 0.840 J/s/m/°C and for air 0.023 4 J/s/m/°C.)
a. 2 530 W b. 426 W c. 3 190 W d. 210 W e. 2 100
A(n) ____ is a small circle whose center is located on the circumference of another larger circle
a. equant b. deferent c. retrograde loop d. ellipse e. epicycle