Located on level land, the flat-roofed schoolhouse is 12 meters wide by 7 meters high. Where should he stand so that the ball may clear the wall without a lot of effort, or as it is more often called, with a low initial velocity? "
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Located on level land, the flat-roofed schoolhouse is 12 meters wide by 7 meters high. Where should he stand so that the ball may clear the wall without a lot of effort, or as it is more often called, with a low initial velocity? "
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- (2) An object initially at rest breaks into two pieces because of an explosion. One pieces has twice the kinetic energy of the other piece. (a) What is the ratio of the masses of the two pieces? (answer: 2) (b) Which piece has the larger mass? (answer: the piece with the smaller kinetic energy)An 71-kg jogger is heading due east at a speed of 1.8 m/s. A 67-kg jogger is heading 54° north of east at a speed of 1.8 m/s. Find (a) the magnitude and (b) the direction of the sum of the momenta of the two joggers. Describe the direction as an angle with respect to due east. (a) Number i (b) Number i Lada North Units Units V2 0 V1 EastA 0.400 kg hammer is moving horizontally at 5.00 m/s when it strikes a nail and comes to rest after driving it 1.00 cm into a board. (a) Calculate the duration of the impact. (b) What was the average force exerted on the nail?
- . (II) A 12-kg hammer strikes a nail at a velocity of 7.5 m/sand comes to rest in a time interval of 8.0 ms. (a) What isthe impulse given to the nail? (b) What is the averageforce acting on the nail?(c) Include adiagram of each of the situations.what is the magnitude of the impulse given to the ball ?
- (a) Compute the impulse necessary to bring to rest the 48.0 kg driver of an automobile initially moving at 20m / s? b) Find the average force on the driver if the deceleration is accomplished gradually by the application of brakes over a 11.6 s inteval? (c) Find the average force if the car is stopped in a collision that brings the driver's seat to rest in 0.100 s assuming the driver is restrained by a seat belt?A bowling ball hangs from a 1.0-m-long cord, Fig. 7–30: (i) A 200-gram putty ball moving 5.0 m/s hits the bowling ball and sticks to it, causing the bowling ball to swing up; (ii) a 200-gram rubber ball moving 5.0 m/s hits the bowling ball and bounces straight back at nearly 5.0 m/s, causing the bowling ball to swing up. Describe what happens. (a) The bowling ball swings up by the same amount in both (i) and (ii). (b) The ball swings up farther in (i) than in (ii). (c) The ball swings up farther in (ii) than in (i). (d) Not enough information is given; we need the contact time between the rubber ball and the bowling ball. (i) (ii)At a hydroelectric power plant, water is directed at highspeed against turbine blades on an axle that turns an electric generator. For maximum power generation, should the turbine blades be designed so that the water is brought to a dead stop, or so that the water rebounds?
- If two particles have equal kinetic energies, are their momenta equal?Based on this graph, the initial downward speed of the fist with mass 0.75 kg is about -13 m/s and the collision time is approximately 25 ms. Find the impulse and the average force exerted on the block by the fist during the collision.Located on level land, the flat-roofed schoolhouse is 12 meters wide by 7 meters high. Where should he stand so that the ball may clear the wall without a lot of effort, or as it is more often called, with a low initial velocity? "