Will a body moving in a circular track have zero acceleration? Vividly explain your making reference to both radial and perpendicular acceleration?
EV (7)
b) In your own words describe first moment of area for any shape and its importance. With reference to the shape below about the axis s – s, describe the position of the centroid.
CR (8)
c) In quantum mechanics, the fundamental constant called Planck’s constant, h, has dimensions of ML2T−1 . Construct a quantity with the dimensions of length from h, a mass m, and c, the speed of light.
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Ответ:
Respuesta: 47,13; 3.456
Explicación:
Dado que la velocidad angular 'ω' = Conversión a radianes por segundo:
Para convertir a radiante por segundo:
1. Divida el valor en revolución por minuto entre 60, en otro para obtener el valor en revolución por segundo.
2. Luego, el valor obtenido se multiplica por 2π, lo que indica una revolución completa en otro para obtener el valor en radianes por segundo.
A.) ω = 450 r.p.m o 450 revoluciones por minuto.
450 r.p.m = 450/60 × 2π
450 r.p.m = (7.5) × 2 × 3.142 = 47.13 rad / sec
B.) ω = 33 r.p.m o 33 revoluciones por minuto.
33 r.p.m = 33/60 × 2π
33 r.p.m = (0.55) × 2 × 3.142 = 3.456 rad / sec