A 10.0-g bouncy ball is confined in a 8.3-cm-long box (an infinite well)
If we model the ball as a point particle, what is the minimum kinetic energy of the ball? (h = 6.626 × 10-34 J ? s)
A) 8.0 × 10-64 J
B) 3.2 × 10-46 J
C) 1.3 × 10-20 J
D) zero
A
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We can see each other in the classroom right now because we
A) emit visible light. B) emit thermal radiation. C) emit infrared light. D) reflect visible light. E) reflect infrared light.
You drive 6.00 km at 50.0 km/h and then another 6.00 km at 90.0 km/h. Your average speed over the 12.0 km drive will be
A) greater than 70.0 km/h. B) equal to 70.0 km/h. C) less than 70.0 km/h. D) exactly 38.0 km/h. E) cannot be determined from the information given, must also know directions traveled
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 slow
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) Increase the amplitude of swing by a small amount.
A block of metal weighs 40 N in air and 30 N in water. What is the buoyant force on the block due to the water? The density of water is 1000 kg/m3
A) 10 N B) 30 N C) 40 N D) 70 N