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Concept explainers
In Example 5.8, we investigated the apparent weight of a fish in an elevator. Now consider a 72.0-kg man standing on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.20 m/s in 0.800 s. It travels with this constant speed for the next 5.00 s. The elevator then undergoes a uniform acceleration in the negative y direction for 1.50 s and comes to rest. What does the spring scale register (a) before the elevator starts to move, (b) during the first 0.800 s, (c) while the elevator is traveling at constant speed, and (d) during the time interval it is slowing down?
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Chapter 5 Solutions
Physics for Scientists and Engineers with Modern, Revised Hybrid (with Enhanced WebAssign Printed Access Card for Physics, Multi-Term Courses)
- A 129 kg crate is sitting at the top of a ramp, which is inclined at an angle of 20 degrees with respect to the horizontal. Someone gives the crate a quick shove to get it moving, after which it slides down the ramp without any further assistance. The coefficient of kinetic friction between the crate and the ramp is ls = 0.23. What is the magnitude of the acceleration (in m/s?) of the crate?arrow_forwardIn the figure, a tin of anti-oxidants (m, magnitude F = 6.3 N acts on the corned beef tin, which has a downward acceleration of 4.0 m/s2. What are (a) the tension in the connecting cord and (b) angle B? 4.4 kg) on a frictionless inclined surface is connected to a tin of corned beef (m, = 2.2 kg). The pulley is massless and frictionless. An upward force of (a) Number Units (b) Number Unitsarrow_forwardA pilot performs an evasive maneuver by diving vertically at 290 m/s. If he can withstand an acceleration of 8.0 g's without blacking out, at what altitude must he begin to pull out of the dive to avoid crashing into the sea? Express your answer to two significant figures and include the appropriate units.arrow_forward
- An elevator cab is pulled upward by a cable.The cab and its single occupant have a combined mass of 2000 kg.When that occupant drops a coin, its acceleration relative to the cab is 8.00 m/s2 downward.What is the tension in the cable?arrow_forwardA 75.0 kg man stands on a platform scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.20 m/s in 1.00 s. It travels with this constant speed for the next 10.00 s. The elevator then undergoes a uniform acceleration in the negative y direction for 1.70 s and comes to rest. What does the scale register:(a) before the elevator starts to move? (b) during the first 1.00 s? Here, what would be the answer of b? As the lift is going up shouldn't the weight be more than what it was initially?arrow_forwardA 78.0 kg man stands on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.83 m/s in 0.800 s. It travels with this constant speed for the next 5.00 s. The elevator then undergoes a uniform acceleration in the negative y direction for 1.70 s and comes to rest. (a) What does the spring scale register before the elevator starts to move? (b) What does it register during the first 0.800 s? N (c) What does it register while the elevator is traveling at constant speed? N (d) What does it register during the time it is slowing down? Narrow_forward
- A 75.0 kg man stands on a platform scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.20 m/s in 1.00 s. It travels with this constant speed for the next 10.00 s. The elevator then undergoes a uniform acceleration in the negative y direction for 1.70 s and comes to rest. What does the scale register (a) before the elevator starts to move? (b) during the first 1s? (c) while the elevator is traveling at constant speed? (d) during the time it is slowing down? Take g = 10 m/s^2.arrow_forwardConsider a person standing on a scale in an elevator. If the elevator accelerates upwards with an acceleration of 1.21 m/s2 and the person has a mass of 102.9 kg, what would the scale read? HINT: you need to take into account the acceleration due to gravity, as well as that of the elevator.arrow_forwardYou are riding an elevator on the way to the eighteenth floor of your dormitory. Near the end of your upward trip, while the elevator is going up and slowing down, the magnitude of the elevator's acceleration is a = 1.98 m/s². Beside you is the box containing your new computer; box and contents have a total mass of 27.5 kg. While the elevator has the described acceleration, you push horizontally on the box to slide it at constant speed toward the elevator door.arrow_forward
- A 72.0-kg man stands on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.20 m/s in 0.800 s. It travels at this constant speed for the next 5.00 s. The elevator then undergoes a uniform acceleration in the negative y-direction for 1.50 s and comes to rest. What does the spring scale register (a) before the elevator starts to move? (b) during the first 0.800 s? (c) while the elevator is traveling at constant speed? (d) during the time it is slowing down?arrow_forwardA copper block with mass m = 200 g, is at rest on a glass surface, where the plane makes an angle θθ = 45∘. Assume that the glass surface is frictionless. Calculate the acceleration of the copper block when it is released from rest. Express your result in m/s2. Using the information presented calculate the force acting on the mass, m = 200 g, just as it is released from the top of the inclined plane, at y = 8.48 m. Express your answer in Newtons.arrow_forwardA box of mass 15.7 kg slides down an inclined plane without friction. If the acceleration, a, of the box along the direction of the plane is 4.1 m/s2, what is the angle θ (in degrees) of the plane with respect to the horizontal?arrow_forward
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
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