Study this H-R diagram. Which of the following stars is the most massive? (The red arrows help you locate these stars on the diagram.)
A) Beta Centauri
B) Vega
C) Bellatrix
D) DX Cancri
A) Beta Centauri
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Refracting Telescope: The length of a telescope is 2.20 m and the focal length of the eyepiece is 1.9 cm. What is the focal length of the objective lens?
A. 41 cm B. 45 cm C. 111 cm D. 218 cm E. 16 cm
Thin Lenses: A plant that is 4.1 cm tall is 10.3 cm from a converging lens. You observe that the image of this plant is virtual and 6.2 cm tall. What is the focal length of the lens?
A. 6.8 cm B. -30 cm C. 16 cm D. 30 cm E. -16 cm
Impedance: A 25.0-mH inductor, a 2.00-?F capacitor, and a certain resistor are connected in series across an ac voltage source at 1.00 kHz. If the impedance of this circuit is 200 ?, what is the value of the resistor?
A. 100 ? B. 184 ? C. 552 ? D. 579 ? E. 200 ?
A 3.0-kg block slides on a rough horizontal surface. A force of 8.0 N acting parallel to the surface is applied to the block. The coefficient of kinetic friction between the block and the surface is 0.15 . What is the magnitude of the block's acceleration?
a. 1.9 m/s2 b. 1.2 m/s2 c. 2.3 m/s2 d. 1.5 m/s2 e. 2.9 m/s2