Engineering Board Exam Reviewer · Physics · medium
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)
- 686.7 N
- 546.7 N
- 140.0 N
- 826.7 N
Answer
D. 826.7 N
Solution
N = m(g + a) = 70(11.81) = 826.7 N.
More Physics questions
- 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)
- A flywheel starts from rest and reaches 300 rpm in 5 s with uniform angular acceleration. How many revolutions does it make during this…
- A wheel of radius 0.3 m rotates at 1200 rpm. What is the linear speed of a point on its rim?
- A wheel rotates at 1200 rpm. What is its angular velocity in rad/s?
- A car travels from A to B at 40 km/h and returns from B to A at 60 km/h along the same road. What is its average speed for the round trip?