A person slaps her leg with her hand, bringing her hand to rest in 265 ms...
A person slaps her leg with her hand, bringing her hand to rest in 265 ms from an initial speed of 3.85 m/s. What is the magnitude of the average force exerted on the leg, in newtons, taking the effective mass of the hand and forearm to be 1.7 kg
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A person slaps her leg with her hand, bringing her hand to rest
in 265 ms...
1.) A 1.7-kg falcon catches and holds onto a 0.675-kg dove from behind in midair. What...
1.) A 1.7-kg falcon catches and holds onto a 0.675-kg dove from behind in midair. What is their final speed, in meters per second, after impact if the falcon’s speed is initially 27 m/s and the dove’s speed is 7.5 m/s in the same direction? 2.) a.) A bowling ball of mass mb = 3.7 kg is rolled down the lane with a velocity of v1 = 2.8 m/s. It strikes a single remaining pin mp = 0.92 kg head...
A soccer player extends her lower leg in a kicking motion by exerting a force with...
A soccer player extends her lower
leg in a kicking motion by exerting a force with the muscle above
the knee in the front of her leg. Suppose she produces an angular
acceleration of 32 rad/s2 and her lower leg has a moment
of inertia of 0.75 kg⋅m2 .
What is the force, in
newtons, exerted by the muscle if its effective perpendicular lever
arm is 2.05 cm?
F =
An object of mass 0.61 kg is initially at rest. When a force acts on it...
An object of mass 0.61 kg is initially at rest. When a force acts on it for 2.9 ms it acquires a speed of 14.8 m/s. Find the magnitude (in N) of the average force acting on the object during the 2.9 ms time interval.
An object of mass 0.53 kg is initially at rest. When a force acts on it...
An object of mass 0.53 kg is initially at rest. When a force acts on it for 2.9 ms it acquires a speed of 14.1 m/s. Find the magnitude (in N) of the average force acting on the object during the 2.9 ms time interval. N
A bsebal approaching a batter with a speed of 31 m/s is hit and leaves the...
A bsebal approaching a batter with a speed of 31 m/s is hit and leaves the bat in the directly opposite direction with a speed of 50 m/s. The mass of the baseball is 0.15 kg. What is the ma gnitude of the impulse (in N s) exerted by the bat onthebaseball? N-S (b) If the time of contact between the bat and the baseball is 2.6 ms, what is the average force exerted by the bat on the baseball...
Elena is experienced in breaking boards with her fist. A high-speed video indicates that her forearm...
Elena is experienced in breaking boards with her fist. A high-speed video indicates that her forearm is moving with a rotational speed of 43 rad/s when it reaches the board. The board breaks in .004 s and her arm is moving at 21 rad/s just after breaking the board. Her fist is 0.32 m from her elbow joint and the rotational inertia of her forearm is .05 kg⋅m2. Determine the magnitude of the average force that the board exerts on...
While unrealistic, we will examine the forces on a leg when one falls from a height...
While unrealistic, we will examine the forces on a leg when one falls from a height by approximating the leg as a uniform cylinder of bone with a diameter of 2.3 cm and ignoring any shear forces. Human bone can be compressed with approximately 1.7 × 108 N/m2 before breaking. A man with a mass of 70 kg falls from a height of 7 m. Assume his acceleration once he hits the ground is constant. For these calculations, g =...
For the karate chop in the figure, assume that the hand has a mass of 0.34...
For the karate chop in the figure, assume that the hand has a mass of 0.34 kg and the speeds of the hand just before and just after hitting the board are 15 m/s and 0, respectively. What is the average force exerted by the first on the board if the list follows through, so the contact time is 3.1 ms? What is the average force exerted by the list on the board if the first stops abruptly, so the...
A person holds a 1.26 N baseball in his hand, a distance of 34.0 cm from...
A person holds a 1.26 N
baseball in his hand, a distance of 34.0 cm from the elbow joint,
as shown in the figure(Figure 1). The biceps, attached at a
distance of 2.75 cm from the elbow, exerts an upward force on the
forearm. Consider the forearm and hand to be a uniform rod with a
mass of 1.40 kg . Suppose the biceps exert just enough upward force
to keep the system in static equilibrium.
< Homework Assignment #11...
A stuntman of mass 80 kg jumps from a building. He hits the ground while moving...
A stuntman of mass 80 kg jumps from a building. He hits the ground while moving with a speed of 72 ms. If it takes a time of 0.025 seconds for the man to come to rest What is the magnitude of the average force that the ground applied to the person in units of newtons? Give the answer as a positive number
A soccer player extends her lower
leg in a kicking motion by exerting a force with the muscle above
the knee in the front of her leg. Suppose she produces an angular
acceleration of 32 rad/s2 and her lower leg has a moment
of inertia of 0.75 kg⋅m2 .
What is the force, in
newtons, exerted by the muscle if its effective perpendicular lever
arm is 2.05 cm?
F =
An object of mass 0.53 kg is initially at rest. When a force acts on it for 2.9 ms it acquires a speed of 14.1 m/s. Find the magnitude (in N) of the average force acting on the object during the 2.9 ms time interval. N
A bsebal approaching a batter with a speed of 31 m/s is hit and leaves the bat in the directly opposite direction with a speed of 50 m/s. The mass of the baseball is 0.15 kg. What is the ma gnitude of the impulse (in N s) exerted by the bat onthebaseball? N-S (b) If the time of contact between the bat and the baseball is 2.6 ms, what is the average force exerted by the bat on the baseball...
For the karate chop in the figure, assume that the hand has a mass of 0.34 kg and the speeds of the hand just before and just after hitting the board are 15 m/s and 0, respectively. What is the average force exerted by the first on the board if the list follows through, so the contact time is 3.1 ms? What is the average force exerted by the list on the board if the first stops abruptly, so the...
A person holds a 1.26 N
baseball in his hand, a distance of 34.0 cm from the elbow joint,
as shown in the figure(Figure 1). The biceps, attached at a
distance of 2.75 cm from the elbow, exerts an upward force on the
forearm. Consider the forearm and hand to be a uniform rod with a
mass of 1.40 kg . Suppose the biceps exert just enough upward force
to keep the system in static equilibrium.
< Homework Assignment #11...
A stuntman of mass 80 kg jumps from a building. He hits the ground while moving with a speed of 72 ms. If it takes a time of 0.025 seconds for the man to come to rest What is the magnitude of the average force that the ground applied to the person in units of newtons? Give the answer as a positive number
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