William and Caroline Herschel's map included four of the following hypotheses in their model of the galaxy. Which one was the exception?
a. They thought that the "holes in the sky" were caused by interstellar dust clouds.
b. They proposed that the galaxy had a disk shape
c. They provided accurate measurements of the distances to stars.
d. They placed the Sun in the center of the galaxy.
e. They found errors caused by a lack of knowledge of the interstellar medium.
c
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A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.00 rad/sec2 acquires an angular velocity of 5.00 rad/sec. The CD continues rotating at 5.00 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the angular distance traveled by a point 4.00 cm from the center, at the time 10.0 seconds from the start?
A. 27.6 rad B. 37.5 rad C. 40.7 rad D. 48.2 rad E. 51.2 rad
The ultimate speed of a solar-sail-propelled spacecraft is limited by the
A) low energy photons that the Sun produces B) gravitational force of the Sun C) fact that the intensity of sunlight falls off rapidly with distance D) mass of the spacecraft
A generator produces 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by an ideal transformer and transmitted through a power line of total resistance 1.0 ?
Find the number of turns in the secondary if the primary has 200 turns. A) 4500 B) 7500 C) 200 D) 5
Is film condensation more effective on vertical tubes or on horizontal tubes?
What will be an ideal response?