u2 _ A pialu w ?ing·he rate of 8.3 rev/s has what upprosimate angular . A 0300 m

Question

u2 _ A pialu w ?ing·he rate of 8.3 rev/s has what upprosimate angular . A 0300 m ?¡us automobile tire accelerates steadily from rest at 2.0 rad/s sendrpetal acceleration of a point on the outer edge of the tire after 5.0 s? 30.0 ms 300ms c 4 A 0400 kg mass is whirled around at the end of a 0.750 m string. The mass sweops out a horicontal cirele. The string ??sential speed of the mass if the string doesn't break? a 370 m's has a 450 N capacity, what is the maximum 220ms 19.0 ms d 29.0 ms iS At what location does an artificial Earth satellite in an elliptical orbit have its greatest speed? a nearest to Earth. b. Farthest from Earth. Between Earth and its moon. Between Earth and the Sun. d p. 4

Explanation / Answer

11) The impulse experienced by a body is equivalent to change in its momentum.

as impulse, F.dt = d(mv) = d(p).

12) spinning rate = 8.3 rev/sec;

1 revolution is equivalent to 2*pi radians;

angular speed = 8.3*2*pi rad/s;

angular speed = 52.15 rad/s.

13) centripetal acceleration (a) = v2/r;

at t = 5 sec;

w = wo + at;

w = 0 + 2*5;

angular speed (w) = 10 rad/s.

linear speed v = r*w = 0.3*10

v = 3 m/s;

centripetal acceleration ac = v2/r;

ac = 9/0.3 = 30 m/ s2.

14) centripetal force Fc = mv2/r;

for the safety of spring, max capacity of spring = centripetal force;

450 = 0.4*v2/0.75;

v = 29.04 m/s.

15) frthest from earth (as linear speed v = r*w)

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