Danny Diver weighs 500 N and steps off a diving board 10 m above the water. Danny hits the water with kinetic energy of
A) 10 J.
B) 500 J.
C) 510 J.
D) 5000 J.
E) more than 5000 J.
Answer: D
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Mass on a Spring: A 92-kg man climbs into a car with worn out shock absorbers, and this causes the car to drop down 4.5 cm. As he drives along he hits a bump, which starts the car oscillating at an angular frequency of 4.52 rad/s. What is the mass of the car?
A. 890 kg B. 760 kg C. 920 kg D. 990 kg E. 1900 kg
On a cold winter's morning you awake and step out of bed. One foot is on the tile floor and the other is on a rug on the floor. Which statement is true?
A. The tile feels colder because it is connected to the cold ground outside B. The tile feels colder because it conducts heat more rapidly away from your foot C. The tile feels colder because it cannot absorb water like the rug can D. The tile feels colder because it is smoother than the rug
Under what circumstances would a nonzero vector lying in the xy plane have components that are equal in magnitude?
1.This can never happen. 2.Always. Components of vectors are always equal in just two dimensions. 3.Only when the vector lies on the x- or y-axes (0°, 90°, 180°, or 270°). 4.Only when the vector lies 45° from the x- or y-axes (45°, 135°, 225°, or 315°).
Which one has the largest range of possibilities [or quantum uncertainty range]?
A) proton B) electron C) dust grain D) helium atom E) water molecule