A cannon is fired from a hill 133 m high at an angle of 24.8° with respect to the horizontal. If the muzzle velocity is 53.9 m/s, what is the speed of a 4.35-kg cannonball when it hits the ground 133 m below? Answer: m/s
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- Calculate the final speed of a 110-kg rugby player who is initially running at 8.00 m/s butt collides head-on with a padded goalpost and experiences a backward force of l.76104N for 5.50102s .a projectile weighing 120 pounds strikes the concrete wall of a fort in a velocity of 1500ft/s. the projectile comes to rest in 0.02s having penetrated the 8-foot thick wall to a distance of 8 feet. what is the average force entered on the wall by the projectile?A 0.35 kg croquet ball is initially at rest on the grass.When the ball is struck by a mallet , the aveage foce exerted on it is 250 N . If the ball's speed after being struct is 3.2 m/s , how long was the mallet in contact with the ball?
- A 10,000 kg railroad car is rolling at 2.00 m/s when a 4000 kg load of gravel is suddenly dropped in. What is the car’s speed just after the gravel is loaded?a baseball catcher puts on an exhibition by catching a 0.15 kg ball, dropped from a helicopter at a height of 100m above the catcher. If the catcher "gives" with the ball for 0.75 m (was originally 1m off the ground) while catching it, what is the average force exerted on the mitt by the ball?Some office workers use a sledgehammer to hit their broken computer and push it across an open field. If the computer has a mass of 5.2 kg and moves across the field with an initial velocity of 10.4 m/sec, how far will it travel before coming to a rest from friction (uopenfield = 0.45)?
- A 730-N man stands in the middle of a frozen pond of radius5.0 m. He is unable to get to the other side because of a lackof friction between his shoes and the ice. To overcome thisdifficulty, he throws his 1.2-kg physics textbook horizontallytoward the north shore at a speed of 5.0 m/s. How long doesit take him to reach the south shore?A 0.25 kg arrow with a velocity of 12 m/s to the east strikes a target and pierces the bull's-eye of a 6-kg target. What is the final velocity o combined mass? Based on the problem, which of the following variables represent 12 m/s?A Maxim machine gun fires 453 bullets per minute. Each bullet has a mass of 12g and a velocity of 660m/s.What the average force that the impact of these bullets exerts on a target? Assume the bullets penetrate the target and remain embedded in itCalculate answer to one decimal
- I am driving down the street at 23.4 mi/h and suddenly I see a squirrel. I slam on the brakes in 0.89 seconds to avoid hitting the squirrel. Luckily, he got away. With what force in kiloNewtons did the 455 kg car come to a stop? Round to the nearest whole hundredth, and enter the magnitude, which does not include negatives.During the pitching motion, a baseball pitcher exerted an average horizontal force of 60 N against the 0.15 kg baseball while moving it through a horizontal displacement of 2.0 m before he released it. If the baseball’s velocity at the start of the pitching motion was zero, how fast was the ball moving at the instant of release?The mass of a particular skateboard plus its rider is m, = 76.6 kg, and the skateboarder is holding a book with mass mo = 3.27 kg. Initially atrest, the skateboarder tosses the textbook with a velocity of vb = 4.44 m/s at an angle 0 = 23.3° above the horizontal, and the book is caught by a friend.