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Chapter 2: 28P (page 82)
A system is acted upon by two forces, and. What is the net force acting on the system?
The net force acting on the system is
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A spherical satellite of approximately uniform density with radius\(4.8m\)and mass\(205kg\)is originally moving with velocity\(\left\langle {2600,0,0} \right\rangle m/s,\)and is originally rotating with an angular speed\(2rad/s,\)in the direction shown in the diagram. A small piece of space junk of mass\(4.1kg\)is initially moving toward the satellite with velocity\(\left\langle { - 2200,0,0} \right\rangle m/s.\)The space junk hits the edge of the satellite at location C as shown in Figure 11.97, and moves off with a new velocity\(\left\langle { - 1300,480,0} \right\rangle m/s.\)Both before and after the collision, the rotation of the space junk is negligible.
At a certain instant a particle is moving in the direction with momentum. During the next a constant force acts on the particle, with and x. What is the magnitude of the momentum of the particle at the end of this interval?
Question: The following questions refer to the circuit shown in Figure 18.114, consisting of two flashlight batteries and two Nichrome wires of different lengths and different thicknesses as shown (corresponding roughly to your own thick and thin Nichrome wires).
The thin wire is 50 cm long, and its diameter is 0.25 mm. The thick wire is 15 cm long, and its diameter is 0.35 mm. (a) The emf of each flashlight battery is 1.5 V. Determine the steady-state electric field inside each Nichrome wire. Remember that in the steady state you must satisfy both the current node rule and energy conservation. These two principles give you two equations for the two unknown fields. (b) The electron mobility
in room-temperature Nichrome is about . Show that it takes an electron 36 min to drift through the two Nichrome wires from location B to location A. (c) On the other hand, about how long did it take to establish the steady state when the circuit was first assembled? Give a very approximate numerical answer, not a precise one. (d) There are about mobile electrons per cubic meter in Nichrome. How many electrons cross the junction between the two wires every second?
cart rolls with low friction on a track. A fan is mounted on the cart, and when the fan is turned on, there is a constant force acting on the cart. Three different experiments are performed:
(a) Fan off: The cart is originally at rest. You give it a brief push, and it coasts a long distance along the track in the +x direction, slowly coming to a stop.
(b) Fan forward: The fan is turned on, and you hold the cart stationary. You then take your hand away, and the cart moves forward, in the +x direction. After traveling a long distance along the track, you quickly stop and hold the cart.
(c) Fan backward: The fan is turned on facing the “wrong” way, and you hold the cart stationary. You give it a brief push, and the cart moves forward, in the +x direction, slowing down and then turning around, returning to the starting position, where you quickly stop and hold the cart. Figure 2.57 displays four graphs of px (numbered 1–4), the x component of momentum, vs. time. The graphs start when the cart is at rest, and end when the cart is again at rest. Match the experiment with the correct graph.
Question: You observe three carts moving to the left. Cart A moves to the left at nearly constant speed. Cart B moves to the left, gradually speeding up. Cart C moves to the left, gradually slowing down. Which cart or carts, if any, experience a net force to the left?
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