At the upper right of the Hertzprung—Russell diagram we find
A) red giant stars
B) supergiant stars
C) white dwarfs
D) main sequence stars
A
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A wheel (radius = 12 cm) is mounted on a frictionless, horizontal axle that is perpendicular to the wheel and passes through the center of mass of the wheel. A light cord wrapped around the wheel supports a 0.40-kg object. If released from rest with the string taut, the object is observed to fall with a downward acceleration of 3.0 m/s2. What is the rotational inertia (of the wheel) about the given axle?
A. 0.023 kg?m2 B. 0.013 kg?m2 C. 0.020 kg?m2 D. 0.016 kg?m2 E. 0.035 kg?m2
Daisy (50. kg mass) skates on ice at 4.0 m/s to greet her friend (70. kg mass), who is standing still, with open arms. As they collide, while holding each other, with what speed do they both move off together?
A) 2.5 m/s B) 1.7 m/s C) zero D) 5.0 m/s
The wavelength of the light from a certain laser is where What is this wavelength in nanometers? (1 nm = 10-9m)
A) 6.6 × 102 nm B) 6.6 × 103 nm C) 6.6 × 101 nm D) 6.6 × 104 nm
The volume of a gas is inversely proportional to the absolute pressure applied to it when the temperature is kept constant
Indicate whether the statement is true or false