A ray of light in water strikes an air–water interface at an angle of incidence greater than the critical angle. The ray
a. emerges but is bent away from the normal.
b. travels along the interface.
c. emerges but is bent toward the normal.
d. is totally reflected into the water.
d
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Simple Pendulum: Grandfather clocks are designed so they can be adjusted by moving the weight at the bottom of the pendulum up or down. Suppose you have a grandfather clock at home that runs fast. Which of the following adjustments of the weight would make it more accurate? (There could be more than one correct choice.)
A. Raise the weight. B. Lower the weight. C. Add more mass to the weight. D. Remove some mass from the weight. E. Decrease the amplitude of swing by a small amount.
A uniform rod is 2.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest at the horizontal position. What is the angular acceleration of the rod at the instant the rod makes an angle of 70° with the horizontal?
a. 3.7 rad/s2 b. 1.3 rad/s2 c. 2.5 rad/s2 d. 4.9 rad/s2 e. 1.9 rad/s2
Slanting Surfaces With Friction: A flatbed truck is carrying a 20-kg crate up a sloping road. The coefficient of static friction between the crate and the bed is 0.40, and the coefficient of kinetic friction is 0.30. What is the maximum angle of slope that the truck can climb at constant speed if the crate is to stay in place?
A. 0.38° B. 13° C. 17° D. 22° E. 68°
Why do we not expect to find a 5-solar-mass neutron star?
What will be an ideal response?