Which of the following energy forms is associated with an object due to its position?
a. potential
b. positional
c. total
d. kinetic
Ans: a. potential
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Molecular clouds can be observed
a. using infrared telescopes to detect ionized gas in the clouds. b. using x-ray telescope to observe the x-ray radiation from the molecules in the cloud. c. using radio telescopes to observe the CO emission from the clouds. d. by looking for blue wispy regions near star clusters. e. by looking for the 21-cm radiation from hydrogen.
What quantities does angular momentum depend upon?
A) mass and velocity B) mass, velocity, and radius C) force and radius D) force, velocity, and radius E) momentum and angular velocity
A 2.0 meter long Aluminum wire (R = 0.44 m?, ? = 2.82 × 10-8 ?-m, ? = 4.29 × 10-3 C-1 ) is connected in series to an 8.0 meter long Tungsten wire (R = 0.20 m?, ? = 5.6 × 10-8 ?-m, ? = 4.5 × 10-3 C-1)
What is the resistance of the combination if the wire is heated to 150.°C? Assume the initial temperature for both wires is room temperature (20°C). A) 0.78 m? B) 0.88 m? C) 0.69 m? D) 1.00 m? E) 0.64 m?
A convex mirror has a focal length of ?20 cm. What is the position of the resulting image (in cm) if the image is upright and four times smaller than the object?
a. ?100 b. ?25 c. ?50 d. ?15 e. ?10