A 1.0-kg block is released from rest at the top of a frictionless incline that makes an angle of 37° with the horizontal. An unknown distance down the incline from the point of release, there is a spring with k = 200 N/m. It is observed that the mass is brought momentarily to rest after compressing the spring 0.20 m. How far does the mass slide from the point of release until it is brought
momentarily to rest?
a. 0.98 m
b. 0.68 m
c. 0.82 m
d. 0.55 m
e. 0.20 m
B
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When salt is introduced to water, the temperature at which freezing occurs is
A) quite unaffected. B) lowered. C) increased. D) dependent on the shape of salt and ice crystals
The event horizon is located at the Schwarzschild radius
a. True b. False Indicate whether the statement is true or false
Mort stands on Earth. Velma moves away from him in a rocket, at 299,000 km/s (1000 km/s slower than lightspeed). Mort sends a laser beam toward Velma. As the tip of the beam passes her rocket, Velma observes that
A) the laser beam moves past her at just 1000 km/s. B) the laser beam moves past her at 300,000 km/s. C) Both of the above. D) the laser beam never catches up with her. E) Mort has turned into a giant frog.
Two-Source Interference of Sound: Two in-phase loudspeakers are placed along a wall and are separated by a distance of 4.00 m. They emit sound with a frequency of 514 Hz. A person is standing away from the wall, in front of one of the loudspeakers. What is the closest distance from the wall the person can stand and hear destructive interference? The speed of sound in air is 343 m/s.
A. 0.34 m B. 0.37 m C. 0.73 m D. 1.2 m E. 1.6 m