A wheel rotating about a fixed axis with a constant angular acceleration of 2.0 rad/s2 starts from rest at t = 0 . The wheel has a diameter of 20 cm. What is the magnitude of the total linear acceleration of a point on the outer edge of the wheel at t = 0.60 s?
a. 0.25 m/s2
b. 0.50 m/s2
c. 0.14 m/s2
d. 0.34 m/s2
e. 0.20 m/s2
a
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The evolution of a medium-mass star like the Sun, when off of the main sequence, is ____
a. strongly affected by mass absorption from the interstellar medium b. strongly affected by mass absorption from the corona c. not affected by mass loss due to increased solar winds d. strongly affected by mass loss due to increased solar winds e. strongly affected by mass loss due to hydrogen fusion
A lunar eclipse occurs when the Moon is in the ______________ phase
Fill in the blank(s) with correct word
Conduction: A concrete wall of a cold storage room measures 3.0 m high, 5.0 m wide, and 20 cm thick. The inside wall is to be covered by a layer of wood in order to reduce the rate of heat flow through the wall by 90 percent. The inner surface of the wooden wall is maintained at -10°C and the outer surface of the concrete wall is at 20°C. The thermal conductivities of concrete and wood are 0.80 W/m ? K (concrete) and 0.040 W/m ? K (wood). What is the temperature difference across the layer of wood?
A. 24 C° B. 25 C° C. 26 C° D. 27 C° E. 28 C°
Suppose you are in an elevator that is traveling upward at constant speed. How does your weight compare to your normal weight on the ground?
A) It is the same. B) You are weightless. C) It is less. D) It is greater.