Answer:
5.71 rad/s , 54.55 rev/min
Explanation:
mass of disc, m = 60 kg
diameter of disc = 35 cm
radius of disc, r = 17.5 cm
Rotational kinetic energy, K = 15 J
Let I be the moment of inertia of the disc and ω be the angular speed of the disc.
The moment of inertia of the disc is given by
I = 0.5 x 60 x 0.175 x 0.175 = 0.92 kg m^2
Kinetic energy
ω = 5.71 rad/s
ω = 5.71 / 2π rev /s
ω = 0.909 rev /s
ω = 0.909 x 60 rev / min = 54.55 rev/min
Answer:
The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics. Its exact value is 299792458 metres per second.
Answer:
D
Explanation:
Two plane mirrors are inclined at 70∘. A ray incident on one mirror at incidence angle θ after reflection falls on the second mirror and is reflected from there parallel to the first mirror, The value of θ is. ∴(θ)=50∘.
Answer:
B. The remaining light bulbs will dim.
don't fail :)
Total distance traveled = 74 + 83 = 157 km.
Total time traveled = 1 + 5 = 6 hours.
Average speed = total distance / total time
Average speed = 157 km / 6 hours = 26.1666 km per hour.
Round the answer as needed.