When landing after a spectacular somersault, a 35.0 kg gymnast decelerates by pushing straight down on...
When landing after a spectacular somersault, a 35.0 kg gymnast decelerates by pushing straight down on the mat. Calculate the force (in N) she must exert if her deceleration is 6.00 times the acceleration of gravity.
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When landing after a spectacular somersault, a 35.0 kg gymnast
decelerates by pushing straight down on...
A 60 kg gymnast leaves the floor to perform a somersault, with a reactive force of 2760 N. The center of gravity is 22 cm perpendicular from the line of action of the force. As she first leaves the fl...
A 60 kg gymnast leaves the floor to perform a somersault, with a reactive force of 2760 N. The center of gravity is 22 cm perpendicular from the line of action of the force. As she first leaves the floor, she can be modelled as a long cylinder with moment of inertia md^2/12 (where d is her length, 1.60 m). The time it takes her to leave the floor is 55 ms. As she leaves the floor calculate: 1. Torque...
questions with answers the cylinder's vertical velocity is zero? 10. A gymnast falls from the high...
questions with answers
the cylinder's vertical velocity is zero? 10. A gymnast falls from the high bar and lands on a 10 cm thick gymnastics mat. The gymnast strikes the back of his head against the mat during his landing. His head is moving at 7 m/s when it first strikes the mat. The mass of his head is 5 kg. The impact ends when the gymnast's head comes to a stop after deflecting the mat 6.5 cm. How much...
This problem is taken from Ahlborn's Zoological Physics, P 5.2. Two young people jump down from...
This problem is taken from Ahlborn's Zoological Physics, P 5.2. Two young people jump down from a height of h = 2.0 m onto the forest floor which has a mud hole and a rocky flat. The boy (M = 70 kg) lands with stiff legs on the muddy ground, which "gives" so that he depresses the ground by Delta_y = 5 cm when being decelerated from the impact velocity U_0 to 0. Determine the impact speed U_0. Calculate the...
11) Bob is moving a 15 kg box along a horizontal floor, by pushing down on...
11) Bob is moving a 15 kg box along a horizontal floor, by pushing down on the box at an angle = 30° below the horizontal with a force of F = 80 N and there is a frictional force of 50 N acting on the box as he pushes. What is the horizontal acceleration of the box? box 12) Using the same information in the above problem, Bob is moving a 15 kg box along a horizontal floor, by...
5. A 65.0-kg woman steps off a 10.0-m diving platform and drops straight down into the...
5. A 65.0-kg woman steps off a 10.0-m diving platform and drops straight down into the water. After entering the water she continues falling through the water until she reaches a depth of 4.00 m. a. Calculate the work done on the woman by gravity and by the water. Ignore air resistance. b. What is the average net force exerted on her over this 4.00-m displacement in the water? c. How does the average net force exerted on the woman...
A sky diver jumps from a helicopter and is falling straight down at 30 m/s when...
A sky diver jumps from a helicopter and is falling straight down at 30 m/s when her parachute opens. From then on, her downward acceleration is approximately = g - cv^2, where g = 9.81 m/s^2 and c is a constant. After an initial "transient" period the descends at a nearly constant velocity of 5 m/s. (a) What is the value of c, and what are its 9 units? (b) What maximum deceleration is the sky diver subjected to? (c)...
HYS1180 Assignment 3 Fall 2019 4. A 150 N horizontal force is pushing a 7.00 kg...
HYS1180 Assignment 3 Fall 2019 4. A 150 N horizontal force is pushing a 7.00 kg block up a ramp that has an angle of 30° above the horizontal. The block accelerates along the ramp with an acceleration of 1.25 m/s. (a) (5 marks) Calculate the force of kinetic friction. (b) (5 marks) What is the coefficient of kinetic friction? Hint Make sure to take into account both the force of gravity on the block, as well as the pushing...
A young ice skater with mass 35.0 kg has fallen and is sliding on the frictionless...
A young ice skater with mass 35.0 kg has fallen and is sliding on the frictionless ice of a skating rink with a speed of 20.0 m/s. a. What is the magnitude of her linear momentum when she has this speed? Express your answer with the appropriate units. b. What is her kinetic energy? Express your answer with the appropriate units. c. What constant net horizontal force must be applied to the skater to bring her to rest in 6.00 s?...
When jumping straight down, you can be seriously injured if you land stiff-legged. One way to...
When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 75-kg man just before contact with the ground has a speed of 5.5 m/s. (a) In a stiff-legged landing he comes to a halt in 2.4 ms. Find the average net force that acts on him during this time. _________N (b) When he bends his knees, he...
You are pushing a 50 kg lawn mower with a force of 80 N at an...
You are pushing a 50 kg lawn mower with a force of 80 N at an angle of 45 degreesfrom the ground (the force points at 45 degreesinto the ground, like how you’d expect when you are pushing a lawn mower). What are the A) horizontal and B) vertical component of this force? The ground is pushing straight upwards at the lawn mower with some amount of normal force. The grassy lawn is also exerting a friction force against the...
questions with answers
the cylinder's vertical velocity is zero? 10. A gymnast falls from the high bar and lands on a 10 cm thick gymnastics mat. The gymnast strikes the back of his head against the mat during his landing. His head is moving at 7 m/s when it first strikes the mat. The mass of his head is 5 kg. The impact ends when the gymnast's head comes to a stop after deflecting the mat 6.5 cm. How much...
This problem is taken from Ahlborn's Zoological Physics, P 5.2. Two young people jump down from a height of h = 2.0 m onto the forest floor which has a mud hole and a rocky flat. The boy (M = 70 kg) lands with stiff legs on the muddy ground, which "gives" so that he depresses the ground by Delta_y = 5 cm when being decelerated from the impact velocity U_0 to 0. Determine the impact speed U_0. Calculate the...
11) Bob is moving a 15 kg box along a horizontal floor, by pushing down on the box at an angle = 30° below the horizontal with a force of F = 80 N and there is a frictional force of 50 N acting on the box as he pushes. What is the horizontal acceleration of the box? box 12) Using the same information in the above problem, Bob is moving a 15 kg box along a horizontal floor, by...
5. A 65.0-kg woman steps off a 10.0-m diving platform and drops straight down into the water. After entering the water she continues falling through the water until she reaches a depth of 4.00 m. a. Calculate the work done on the woman by gravity and by the water. Ignore air resistance. b. What is the average net force exerted on her over this 4.00-m displacement in the water? c. How does the average net force exerted on the woman...
A sky diver jumps from a helicopter and is falling straight down at 30 m/s when her parachute opens. From then on, her downward acceleration is approximately = g - cv^2, where g = 9.81 m/s^2 and c is a constant. After an initial "transient" period the descends at a nearly constant velocity of 5 m/s. (a) What is the value of c, and what are its 9 units? (b) What maximum deceleration is the sky diver subjected to? (c)...
HYS1180 Assignment 3 Fall 2019 4. A 150 N horizontal force is pushing a 7.00 kg block up a ramp that has an angle of 30° above the horizontal. The block accelerates along the ramp with an acceleration of 1.25 m/s. (a) (5 marks) Calculate the force of kinetic friction. (b) (5 marks) What is the coefficient of kinetic friction? Hint Make sure to take into account both the force of gravity on the block, as well as the pushing...
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