A spring (k = 600 N/m) is placed in a vertical position with its lower end supported by a horizontal surface. A 2.0-kg block that is initially 0.40 m above the upper end of the spring is dropped from rest onto the spring. What is the kinetic energy of the block at the instant it has fallen 0.50 m (compressing the spring 0.10 m)?
a. 5.3 J
b. 6.8 J
c. 6.3 J
d. 5.8 J
e. 6.5 J
B
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When you touch a warm pot on the stove,
A) work flows from your hand to the pot. B) work flows from the pot to your hand. C) thermal energy flows from your hand to the pot. D) thermal energy flows from the pot to your hand. E) electric energy flows from the pot to your hand.
Thin Films: A puddle of water has a thin film of gasoline floating on it. A beam of light is shining perpendicular on the film. If the wavelength of light incident on the film is 560 nm and the indices of refraction of gasoline and water are 1.40 and 1.33, respectively, what must be the minimum thickness of the film to see a bright reflection?
A. 100 nm B. 200 nm C. 300 nm D. 400 nm E. 500 nm
What are coronal holes?
A) regions on the photosphere where magnetic lines poke through, creating the cooler areas of the sunspots B) areas of the corona where magnetic field lines project into space, allowing charged particles to escape the Sun, becoming part of the solar wind C) holes in the corona of the Sun that allow us to see the photosphere D) tunnels in the outer layers of the Sun through which photons can escape more quickly than through the radiation zone
The logarithm of the ratio of the initial cross-sectional area to the area at the location of fracture of a specimen is equal to the _____________ to fracture.
Fill in the blank(s) with the appropriate word(s).