Engineering Board Exam Reviewer · Physics · hard
What minimum speed must a bucket of water have at the top of a vertical circle of radius 2 m so that the water does not fall out? (g = 9.81 m/s2)
- 4.429 m/s
- 6.264 m/s
- 19.620 m/s
- 2.215 m/s
Answer
A. 4.429 m/s
Solution
At the top, gravity alone provides the centripetal force: mg = mv2/r v = sqrt(gr) = sqrt(19.62) = 4.429 m/s.
More Physics questions
- At what angle should a curve of radius 100 m be banked so that a car traveling at 25 m/s needs no friction? (g = 9.81 m/s2)
- What minimum coefficient of static friction is needed for a car to round a flat curve of radius 50 m at 20 m/s without skidding? (g = 9.81…
- A 1000 kg car rounds a flat curve of radius 50 m at 20 m/s. What centripetal force is required?
- A 70 kg person stands on a scale in an elevator accelerating upward at 2 m/s2. What does the scale read? (g = 9.81 m/s2)
- Two masses of 5 kg and 3 kg hang on either side of a frictionless, massless pulley. What is the tension in the string? (g = 9.81 m/s2)
- Two masses of 5 kg and 3 kg hang on either side of a frictionless, massless pulley (Atwood machine). What is the acceleration of the…
- A block slides down a 30° incline with a coefficient of kinetic friction of 0.2. What is its acceleration? (g = 9.81 m/s2)
- A block slides down a frictionless incline of 30°. What is its acceleration? (g = 9.81 m/s2)
- An astronaut weighs 735.75 N on Earth. What is the astronaut's mass on the Moon?
- What is the weight of a 75 kg person on Earth? (g = 9.81 m/s2)