A bucket in an old well is hoisted upward by a rope that winds up on a cylinder having a radius of 0.10 m. How many rev/s must the cylinder turn if the bucket is raised at a speed of 0.15 m/s?
a. 3.0 rev/s
c. 0.48 rev/s
b. 1.5 rev/s
d. 0.24 rev/s
D
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A 30.0-kg child sits on one end of a long uniform beam having a mass of 20.0 kg, and a 40.0-kg child sits on the other end
The beam balances when a fulcrum is placed below the beam a distance 1.10 m from the 30.0-kg child. How long is the beam? A) 2.12 m B) 1.98 m C) 1.93 m D) 2.07 m E) 2.20 m
Professional astronomical telescopes generally have a much greater magnification than the telescopes you can buy in stores
Indicate whether the statement is true or false
The angle of incidence
A) must equal the angle of reflection. B) is always less than the angle of reflection. C) is always greater than the angle of reflection. D) may be less than or equal to the angle of reflection. E) may be greater than or equal to the angle of reflection.
A race car goes around a curve at 50 m/s. The radius of the curve is 400 m. What is the car's acceleration?