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Crazy boy [7]
3 years ago
12

An object of mass 8kg moved around the circle of radius 4m. with a constant speed of 15m/s.

Physics
1 answer:
Marianna [84]3 years ago
4 0

Answer:

a. Angular velocity = 0.267rad/s.

b. Centripetal acceleration = 56.25m/s.

Explanation:

<u>Given the following data;</u>

Mass, m = 8kg

Radius, r = 4m

Constant speed, V = 15m/s

a. To find the angular velocity

Angular velocity = radius/speed

Substituting into the equation, we have;

Angular velocity = 4/15

Angular velocity = 0.267rad/s

b. To find the acceleration;

Centripetal acceleration = V²/r

Substituting into the equation, we have;

Centripetal acceleration = 15²/4

Centripetal acceleration = 225/4

Centripetal acceleration = 56.25m/s.

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A dentist’s drill starts from rest. After 4.28 s of constant angular acceleration it turns at a rate of 28940 rev/min. Find the
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Answer:

Angular acceleration, is 708.07\ rad/s^2

Explanation:

Given that,

Initial speed of the drill, \omega_i=0

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We need to find the drill’s angular acceleration. It is given by the rate of change of angular velocity.

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3 years ago
A horse shoe magnet is placed on a mass balance such that a uniform magnetic field of magnitude B runs between it from North to
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Answer:

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(b) Total measured mass M' = M - BVL/Rg

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The magnetic force is given by the formula;

Fb = B*I*L -------------------2

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Fb = B*V*L/R -------------------3

Change in mass (Δm) is given as:

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Putting equation 3 into equation 4, we have;

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A bicycle rider travels 50.0 km in 2.5 hours. What is his average speed?
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