Since all stars begin their lives with the same basic composition, what characteristic most determines how they will differ?
A) time they are formed
B) mass they are formed with
C) color they are formed with
D) luminosity they are formed with
E) location where they are formed
B
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As a result of friction between internal parts of an isolated system
a. the total mechanical energy of the system increases. b. the total mechanical energy of the system decreases. c. the total mechanical energy of the system remains the same. d. the potential energy of the system increases but the kinetic energy remains the same. e. the kinetic energy of the system increases but the potential energy of the system remains the same.
Projectile Motion: At target practice, a rifle bullet is fired at an angle of 30° below the horizontal with an initial velocity of 800 m/s from the top of a cliff 80 m high. How far from the base of the cliff does it strike the level ground below if air resistance is negligible?
Fill in the blank(s) with the appropriate word(s).
Answer the following statement(s) true (T) or false (F)
1. In example R9.3, the spaceship engines convert 60,000 kg of matter–antimatter fuel to massless light. The mass of the total system (empty spaceship plus flash of light, considered as a unit) thus decreases. 2. Mass is converted to energy in this process. 3. The total system’s mass decreases in this process. 4. Special relativity teaches us that energy is the same as mass.
Two long parallel wires that are 0.40 m apart carry currents of 10 A in opposite directions
What is the magnetic field strength in the plane of the wires at a point that is 20 cm from one wire and 60 cm from the other? (?0 = 4? × 10-7 T ? m/A) A) 3.3 µT B) 67 µT C) 33 µT D) 6.7 µT