Try dropping simultaneously two sticks into a flowing river, one near the edge of the river and one near the middle. Which one travels faster? Why?
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Try dropping simultaneously two sticks into a flowing river, one near the edge of the river and one near the middle. Which one travels faster? Why?
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- Which two factors affect how much time a ball rolling horizontally off a table top will be in the air?Consider a rock thrown off a bridge of height 73.4 m at an angle θ = 25° with respect to the horizontal as shown in Figure P4.20. The initial speed of the rock is 10.9 m/s. Find the following quantities: (a) the maximum height reached by the rock (b) the time it takes the rock to reach its maximum height (c) the time at which the rock lands (d) how far horizontally from the bridge the rock lands (e) the velocity of the rock (magnitude and direction) just before it lands. magnitude (f) direction: Give your answer in degrees. If you think the answer is "20 degrees down from the positive x-axis", you would enter "-20" (note the negative sign!)A ball-launching machine launches a ball of 500 g toward the wall at 10.0 m/s at 30.0° above the horizontal. It hits the wall and bounces back until it falls a distance S from the wall. The coefficient of restitution between the ball and the wall is 0.5. Determine: a. The speed at which the ball hits the wall.b. The speed at which the ball rebounds from the wall.c. The distance S at which the ball falls measured from the wall.
- A projectile is fired vertically upward with a given initial velocity. It reaches a maximum height of 100 m. If the same projectile is fired again with double the initial velocity. The projectile will reach a maximum height of a) 70.7 m b) 141.4 m c) 200 m d) 241 m e) 400 mA boy wishes to throw a ball over a flat roofed school house that stands 12 m wide and 7.5 m high on level ground. Assuming that the ball will leave his hand at a height of 5 m above the ground,determine how far from the wall he should take his hand in order to make the ball clear the roof with least effort, that is, with minimum velocity.A player hits a baseball, which has an initial velocity of 42 m/s. At the moment the ball is hit with the bat, the height of the baseball will be 0.22 m. The distance from the point of contact to the wall is 170 m. The baseball has an angle of 40 degrees with respect to the horizontal. The player will get a home run, if he or she hits the baseball pass the wall. The height of the wall is 6m. \\ a) Will the player get a homerun? if so, the by how much does the baseball clear the wall? b) Now assume that the wall is completely removed. Find the horizontal range and maximum height of the baseball. Also assume that the path of the baseball is symmetrical, so it lands at a location that is 0.22 m above the ground.
- A girl throws a ball with a horizontal velocity of 2.4 m/s from the height of 0.90 m. If the coefficient of restitution of the ball and the ground is 0.80, determine the following:a. vertical velocity after it rebounds from the ground.b. resultant velocity after it rebounds from the ground.c. Maximum height the ball will reach after the first rebound.You stand still and throw a ball straight upwards with an initial speed of 7.50 m/s. You then repeat this experiment while on a moving sidewalk that is moving horizontally with a speed of 0.500 m/s. How high does the ball go?A dog is chasing a cat, which is chasing a mouse. All of the animals are moving in one dimension. The mouse is in the lead, moving at 3.84 m/s . The cat is in the middle moving at 1.58 m/s.The dog is in the back moving at 3.27 m/s. All velocities are relative to the ground what is the velocity of the dog from the perspective of the mouse.
- How much must be the velocity (V0) of the shot so that he can dunk the ball in the basket?A 15g bullet is fired horizontally into a 3 kg block of wood suspended by a long cord. The bullet sticks in the block. Compute the speed of the bullet if the impact causes the block to swing 10cm above its initial level. A. 0.254 km/s B. 0.252 km/ C. 0.281 km/s D. 0.218 km/sA man at the top of a tower throws an object horizontally whereas he simply drops another.Will these two objects reach the Earth at the same time