Regarding the validity of the law of conservation of energy,
A) it is valid for any situation in which Newtonian physics is valid, but is often incorrect outside of that range.
B) it is valid in all situations except those situations involving heat.
C) this law is a consequence of Newtonian physics, and so this law is valid in every known situation because Newtonian physics is valid in every known situation.
D) it is valid in every known situation--including those situations in which Newtonian physics is not valid.
D
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Waves on a String: A 15-m rope is pulled taut with a tension of 140 N. It takes 0.545 s for a wave to propagate along the rope. What is the mass of the rope?
A. 1.7 kg B. 2.1 kg C. 2.8 kg D. 5.1 kg E. 3.2 kg
The force per unit area exerted by an electromagnetic wave is called the
A) energy density. B) power. C) intensity. D) radiation pressure. E) radiation field.
What is the average orbital speed of Earth around the Sun? (Note: r = 1.5 × 1011 m and P = 3.16 × 107 s.)
A. about 30 km/s B. about 4.7 km/s C. about 9.8 m/s2 D. 1,000 km/s E. 365 days
A billiard ball (ball #1) moving at 5 m/s strikes a stationary ball (ball #2) of the same mass. After the collision, ball #1 moves at a speed of 4.35 m/s. Find the speed of ball #2 after the collision.
a. 1.25 m/s b. 1.44 m/s c. 2.16 m/s d. 2.47 m/s e. 2.68 m/s