A 68.72-kg pitching machine (excluding the baseball) is placed on a frozen pond. The machine fires...
A 68.72-kg pitching machine (excluding the baseball) is placed on a frozen pond. The machine fires a 0.05-kg baseball with a speed of 32.99 m/s in the horizontal friction. What is the recoil speed in m/s of the pitching machine? (Assume negligible friction.)
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A 68.72-kg pitching machine (excluding the baseball) is placed
on a frozen pond. The machine fires...
1. Two objects collide and stick together. Kinetic energy Select one: a. unable to determine with...
1. Two objects collide and stick together. Kinetic energy Select one: a. unable to determine with the information. b. Kinetic energy is conserved. c. Kinetic energy is not conserved. d. is conserved only if the environment is frictionless. 2. A ball of mass 0.10 kg is dropped from a height of 12 m. Its momentum when it strikes the ground is Select one: a. 2.4 kg·m/s. b. 1.8 kg·m/s. c. 1.5 kg·m/s. d. 4.8 kg·m/s. 3. If you double the...
Q1 A small object with a momentum of magnitude 2.71 kg m/s approaches head-on a large...
Q1 A small object with a momentum of magnitude 2.71 kg m/s approaches head-on a large object at rest. The small object bounces straight back with a momentum of magnitude 6.19 kg m/s. What is the magnitude of the small object's momentum change in kg m/s? Q2 A force acts on a 4.708 kg mass as follows: the force starts at zero and rises to 60.334 N linearly in 2.24 seconds, it remains at 60.334 N for another 5.756 seconds,...
2. A hunter on a frozen, essentially frictionless pond, uses a rifle that shoots a 4.20-g...
2. A hunter on a frozen, essentially frictionless pond, uses a rifle that shoots a 4.20-g bullet at a speed of 965-m/s. The mass of the hunter and rifle is 73.5-kg, and the hunter holds the rifle tightly as he fires it. Find the recoil speed of the hunter right after firing, if: a) He fires it horizontally; b) He fires it at an angle of 55.0° above the horizontal.
roblem 1 angle of 40o The pitching machine is adjusted so that the baseball is launched...
roblem 1 angle of 40o The pitching machine is adjusted so that the baseball is launched with a speed of vA- 30 m/s at an initial (a) Determine the time it takes for the ball to strike the ground at B (b) Determine the velocity of the baseball whenit strikes the ground at B. [Hint: Determine its horizontal and vertical velocity components first.] (c) Determine the distance R between the pitching machine and point B 30 m/s A 40° 1.2...
17. A baseball was launched from a pitching machine that was placed on a platform The...
17. A baseball was launched from a pitching machine that was placed on a platform The height of the ball in feet, h, is given by the equation h-16t2 +85t+9, where t is the time in seconds since the ball was launched. What is the meaning of the term 85t? The platform was 85 feet high. The ball was launched with an initial upward velocity of 85 feet per second The ball was launched with an initial upward velocity of...
An ice skater of mass m is given a shove on a frozen pond. After the...
An ice skater of mass m is given a shove on a frozen pond. After the shove, she has a speed of Vo = 2 m/s. Assuming that the only horizontal force that acts on her is a slight frictional force between the blades of the skates and the ice: Draw a free body diagram showing the horizontal force and the two vertical forces that act on her. Identify these forces. Use the work-energy theorem to find the distance the...
A battleship that is 5.85 times 10^7 kg and originally at rest fires a 1100-kg artillery...
A battleship that is 5.85 times 10^7 kg and originally at rest fires a 1100-kg artillery shell horizontally with a velocity of 595 m/s. (a) If the shell is fired straight aft (toward the rear of the ship), there will be negligible friction opposing the ship's recoil. Calculate the recoil velocity of the ship, taking the firing direction to be the positive direction. (b) Calculate the change kinetic energy for the ship and the shell. This energy is less than...
A hockey puck is sliding across a frozen pond with an initial speed of 5.3 m/s....
A hockey puck is sliding across a frozen pond with an initial speed of 5.3 m/s. It comes to rest after sliding a distance of 11.6 m. What is the coefficient of kinetic friction between the puck and the ice?
A baseball pitcher loosens up his pitching arm. He tosses a 0.15-kg ball using only the...
A baseball pitcher loosens up his pitching arm. He tosses a 0.15-kg ball using only the rotation of his forearm, 0.32 m in length, to accelerate the ball. If the ball starts at rest and is released with a speed of 12 m/s in a time of 0.40 s, what torque is applied to the ball while being held by the pitcher's hand to produce the angular acceleration?
A 725 N man stands in the middle of a frozen pond of radius 9.0 m....
A 725 N man stands in the middle of a frozen pond of radius 9.0 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 1.2 kg physics textbook horizontally toward the north shore at a speed of 9.0 m/s. How long does it take him to reach the south shore? s
roblem 1 angle of 40o The pitching machine is adjusted so that the baseball is launched with a speed of vA- 30 m/s at an initial (a) Determine the time it takes for the ball to strike the ground at B (b) Determine the velocity of the baseball whenit strikes the ground at B. [Hint: Determine its horizontal and vertical velocity components first.] (c) Determine the distance R between the pitching machine and point B 30 m/s A 40° 1.2...
17. A baseball was launched from a pitching machine that was placed on a platform The height of the ball in feet, h, is given by the equation h-16t2 +85t+9, where t is the time in seconds since the ball was launched. What is the meaning of the term 85t? The platform was 85 feet high. The ball was launched with an initial upward velocity of 85 feet per second The ball was launched with an initial upward velocity of...
An ice skater of mass m is given a shove on a frozen pond. After the shove, she has a speed of Vo = 2 m/s. Assuming that the only horizontal force that acts on her is a slight frictional force between the blades of the skates and the ice: Draw a free body diagram showing the horizontal force and the two vertical forces that act on her. Identify these forces. Use the work-energy theorem to find the distance the...
A battleship that is 5.85 times 10^7 kg and originally at rest fires a 1100-kg artillery shell horizontally with a velocity of 595 m/s. (a) If the shell is fired straight aft (toward the rear of the ship), there will be negligible friction opposing the ship's recoil. Calculate the recoil velocity of the ship, taking the firing direction to be the positive direction. (b) Calculate the change kinetic energy for the ship and the shell. This energy is less than...
A hockey puck is sliding across a frozen pond with an initial speed of 5.3 m/s. It comes to rest after sliding a distance of 11.6 m. What is the coefficient of kinetic friction between the puck and the ice?
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