An object of mass 4 kg is thrown vertically upwards from ground level with an initial speed of 20 m/s. Ignore friction and use g = 10 m/s2. What is the kinetic energy of the object as it reaches its maximum height?
A) 800 J
B) 400 J
C) 200 J
D) 0 J
E) 80 J
D
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The filament in a light bulb has a diameter of 0.050 mm and an emissivity of 1.0. The temperature of the filament is 3000°C. What should be the length of the filament so it will radiate 60 W of power?
The Stefan-Boltzmann constant is 5.670 × 10-8 W/m2 · K4. A) 11 cm B) 9.4 cm C) 8.6 cm D) 7.2 cm E) 5.9 cm
The__________is a theory that proposed to account for spiral arms as compressions of the interstellar medium in the disk of the galaxy
A) spiral relativity theory B) spiral density wave theory C) spiral tracer theory D) spiral arm theory
According to the authors of the text, the theory of relativity
A) does not violate our common sense. B) violates common sense because it contradicts logic. C) violates common sense because it is counterintuitive. D) violates common sense because the theory contradicts itself in many cases. E) violates common sense because it is full of paradoxes.
The position of a mass that is oscillating on a spring is given by x = (12.3 cm) cos[(1.26 s-1)t]. What is the speed of the mass when t = 0.805 s?
A) - 13.2 cm/s B) 13.2 cm/s C) 8.19 cm/s D) - 8.19 cm/s E) 0 cm/s