
(a)
The result of jumping from the second story balcony to the pavement below, landing stiff-legged on the feet.
(a)

Answer to Problem 1CQ
The person will incur injuries due to the large impulsive force acting on the person’s feet when he jumps from the second story balcony to the pavement below, landing stiff-legged on the feet.
Explanation of Solution
When a person is jumping from certain height, the possibilities of being injured internally depends primarily the average force acting to slow down the body. The impulsive force acting on the feet determines the likelihood of injuries.
The time interval for stopping for a person landing stiff legged on pavement is very short. Since the time interval is small, the average force acting on the person’s feet and other parts of leg is very large in accordance with the impulse-momentum theorem. The large impulsive force on the person’s feet and leg results the person to incur injuries when landing stiff legged on the pavement.
(b)
The result of a person jumping into a privet hedge, landing on his back and rolling to his feet.
(b)

Answer to Problem 1CQ
The likelihood of being injured upon jumping is very less when the person jumps into a privet hedge, landing on his back and rolling to his feet.
Explanation of Solution
When a person is jumping from certain height, the possibilities of being injured internally depends primarily the average force acting to slow down the body. The impulsive force acting on the feet determines the likelihood of injuries.
The time interval in stopping the person jumping into a privet hedge is high and as a result, the average force acting on the person’s torso is very low. Therefore, the likelihood of being injured upon jumping is very less when the person jumps into a privet hedge, landing on his back and rolling to his feet. However, the person may suffer superficial scratches.
(c)
The result of a person jumping into a firefighter’s net, landing on his back, and the method to increase the cushion the fall.
(c)

Answer to Problem 1CQ
The net stretches as the person falls into it, which increases the time interval in stopping the person. The person will not be injured during the event. In order to increase the cushion the person’s fall, the firefighter starts with the net held high and lower the net with their hands as the person lands.
Explanation of Solution
The firefighter’s net offers large time interval for bringing the person to rest. When the person falls in the net, the net stretches downward, gradually bringing the person to rest. The impulsive force in this situation is very low due to the large time interval.
In order to cushion the person’s fall, the firefighter starts with the net held high and lower the net with their hands as the person lands. This further extends the time interval during which the person is brought to rest.
Want to see more full solutions like this?
Chapter 7 Solutions
Physics
- Two conductors having net charges of +14.0 µC and -14.0 µC have a potential difference of 14.0 V between them. (a) Determine the capacitance of the system. F (b) What is the potential difference between the two conductors if the charges on each are increased to +196.0 µC and -196.0 µC? Varrow_forwardPlease see the attached image and answer the set of questions with proof.arrow_forwardHow, Please type the whole transcript correctly using comma and periods as needed. I have uploaded the picture of a video on YouTube. Thanks,arrow_forward
- A spectra is a graph that has amplitude on the Y-axis and frequency on the X-axis. A harmonic spectra simply draws a vertical line at each frequency that a harmonic would be produced. The height of the line indicates the amplitude at which that harmonic would be produced. If the Fo of a sound is 125 Hz, please sketch a spectra (amplitude on the Y axis, frequency on the X axis) of the harmonic series up to the 4th harmonic. Include actual values on Y and X axis.arrow_forwardSketch a sign wave depicting 3 seconds of wave activity for a 5 Hz tone.arrow_forwardSketch a sine wave depicting 3 seconds of wave activity for a 5 Hz tone.arrow_forward
- The drawing shows two long, straight wires that are suspended from the ceiling. The mass per unit length of each wire is 0.050 kg/m. Each of the four strings suspending the wires has a length of 1.2 m. When the wires carry identical currents in opposite directions, the angle between the strings holding the two wires is 20°. (a) Draw the free-body diagram showing the forces that act on the right wire with respect to the x axis. Account for each of the strings separately. (b) What is the current in each wire? 1.2 m 20° I -20° 1.2 marrow_forwardplease solve thisarrow_forwardplease solve everything in detailarrow_forward
- 6). What is the magnitude of the potential difference across the 20-02 resistor? 10 Ω 11 V - -Imm 20 Ω 10 Ω 5.00 10 Ω a. 3.2 V b. 7.8 V C. 11 V d. 5.0 V e. 8.6 Varrow_forward2). How much energy is stored in the 50-μF capacitor when Va - V₁ = 22V? 25 µF b 25 µF 50 µFarrow_forward9). A series RC circuit has a time constant of 1.0 s. The battery has a voltage of 50 V and the maximum current just after closing the switch is 500 mA. The capacitor is initially uncharged. What is the charge on the capacitor 2.0 s after the switch is closed? R 50 V a. 0.43 C b. 0 66 C c. 0.86 C d. 0.99 C Carrow_forward
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningUniversity Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSONIntroduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningLecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-WesleyCollege Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON





