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Chapter 9: Q113P (page 255)
A railroad car moves under a grain elevator at a constant speed of . Grain drops into the car at the rate of. What is the magnitude of the force needed to keep the car moving at constant speed if friction is negligible?
Magnitude of force needed to keep the car moving at constant speed is 28.8 N
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Until his seventies, Henri LaMothe (Figure 9-48.) excited audiences by belly-flopping from a height of 12 minto 30 cmof water. Assuming that he stops just as he reaches the bottom of the water and estimating his mass, find the magnitude of the impulse on him from the water.
A2100 KGtruck travelling north at 41 km/h turns east and accelerates to 51 km/h. (a) What is the change in the truck鈥檚 kinetic energy? What are the (b) Magnitude and (c) Direction of the change in its momentum?
The script for an action movie calls for a small race car (of mass 1500 Kgand length 3.0 m ) to accelerate along a flattop boat (of mass 4000 kgand length 14 m), from one end of the boat to the other, where the car will then jump the gap between the boat and a somewhat lower dock. You are the technical advisor for the movie. The boat will initially touch the dock, as in Fig. 9-81; the boat can slide through the water without significant resistance; both the car and the boat can be approximated as uniform in their mass distribution. Determine what the width of the gap will be just as the car is about to make the jump.
An atomic nucleus at rest at the origin of an xycoordinate system transforms into three particles. Particle 1, mass , moves away from the origin at velocity; particle 2, mass, moves away at velocity.(a) In unit-vector notation, what is the linear momentum of the third particle, mass? (b) How much kinetic energy appears in this transformation?
A 1.2 kgball drops vertically onto a floor, hitting with a speed of 25 m/sIt rebounds with an initial speed of10m/s. (a) What impulse acts on the ball during the contact? (b) If the ball is in contact with the floor for 0.020s, what is the magnitude of the average force on the floor from the ball?
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