Velocity Addition: Two spaceships approach each other along a straight line at a constant relative velocity of 0.9880c as measured by the captain of one of the ships. An observer on Earth is able to measure the speed of only one of the ships as 0.9000c. From the point of view of the observer on Earth, what is the speed of the other ship in terms of the speed of light?
Fill in the blank(s) with the appropriate word(s).
0.794c
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Indicate whether the statement is true or false
A rectangular coil (0.20 m × 0.80 m) has 200 turns and is in a uniform magnetic field of 0.30 T. When the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.080 N / m. What is the current in the coil?
a. 5.0 mA b. 1.7 A c. 8.3 mA d. 1.0 A e. 42 mA
A 2000-kg sailboat experiences an eastward force of 2000 N by the ocean tide and a wind force against its sails with magnitude of 6000 N directed toward the northwest (45° N of W). What is the magnitude of the resultant acceleration?
a. 2.2 m/s2 c. 1.5 m/s2 b. 2.4 m/s2 d. 3.0 m/s2
The typical temperature of an interstellar cloud that could collapse to a protostar is about ________.
A. 1,500 K B. 10 K C. 300 K D. 1,000 K