A lamp radiates 75. J/s when the room is set on 27°C but it radiates 90. J/s when the room temperature drops to 10.°C. What is the temperature of the lamp?
A) 86.°C
B) 97.°C
C) 86. K
D) 110.°C
E) 97. K
A
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An auto manufacturer advertises that their car can go "from zero to sixty in eight seconds." This is a description of what characteristic of the car's motion?
A) average speed B) instantaneous speed C) average acceleration D) instantaneous acceleration E) displacement
Springs: A 3.0-kg brick rests on a perfectly smooth ramp inclined at 34° above the horizontal. The brick is kept from sliding down the plane by an ideal spring that is aligned with the surface and attached to a wall above the brick. The spring has a spring constant (force constant) of 120 N/m. By how much does the spring stretch with the brick attached?
A. 360 cm B. 240 cm C. 14 cm D. 24 cm E. 36 cm
Calculate the light intensity 1.45 m from a light bulb that radiates 100 W equally in all directions
A) 3.78 W/m2 B) 4.36 W/m2 C) 47.6 W/m2 D) 54.7 W/m2
A 10. kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. The spring constant is
A) 5.0 N/cm B) 49 N/cm C) 0.20 N/cm D) 20. N/m E) 0.0020 N/cm