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1. Dr. Nelson is holding two weights at...
A student sits on a freely rotating stool holding two weights, each of mass 3.08 kg....
A student sits on a freely rotating stool holding two weights, each of mass 3.08 kg. When his arms are extended horizontally, the weights are 0.91 m from the axis of rotation and he rotates with an angular speed of 0.755 rad/s. The moment of inertia of the student plus stool is 3.08 kg·m2 and is assumed to be constant. The student pulls the weights inward horizontally to a position 0.294 m from the rotation axis. (a) Find the new...
A student sits on a freely rotating stool holding two weights, each of mass 4 kg.. When his arms are extended horizonta...
A student sits on a freely rotating stool holding two weights, each of mass 4 kg.. When his arms are extended horizontally, the weights are 1.1 m from the axis of rotation and he rotates with an angular speed of 0.9 rad/s. The moment of inertia of the student plus stool is 3.0 kg-m2 and is assumed to be constant. The student pulls the weights inward horizontally to a position 0.4 m from the rotation axis. Find the new angular...
A student sits on a freely rotating stool holding two weights, each of which has a...
A student sits on a freely rotating stool holding two weights, each of which has a mass of 2.84kg. When his arms are extended horizontally, the weights are 0.970m from the axis of rotation and he rotates with an angular speed of 0.608rad/s. The moment of inertia of the student plus stool is 4.85kgm^2 and is assumed to be constant. The student pulls the weights inward horizontally to a position 0.200m from the rotation axis. Find the new angular speed...
A helicopter has two blades (see figure), each of which has a mass of 250 kg...
A helicopter has two blades (see figure), each of which has a mass of 250 kg and can be approximated as a thin rod of length 6.7 m. The blades are rotating at an angular speed of 53 rad/s. (a) What is the total moment of inertia of the two blades about the axis of rotation? (a) Determine the rotational kinetic energy of the spinning blades.
A helicopter has two blades (see figure), each of which has a mass of 240 kg...
A helicopter has two blades (see figure), each of which has a
mass of 240 kg and can be approximated as a thin rod of length 6.7
m. The blades are rotating at an angular speed of 43 rad/s.
(a) What is the total moment of inertia of the two
blades about the axis of rotation? (a) Determine
the rotational kinetic energy of the spinning blades.
can someone help me with questions 3 and 4 please !! 3. A machine part has...
can
someone help me with questions 3 and 4 please !!
3. A machine part has the shape of a solid uniform sphere of mass 205 g and diameter 4.50 cm. It is spinning about a frictionless axle through its center, but at one point on its equator it is scraping against metal, resulting in a friction force of 0.0200 N at that point. Find its angular acceleration. Let the direction the sphere is spinning be the positive sense of...
A student sits on a freely rotating stool holding two dumbbells, each of mass 2.99 kg...
A student sits on a freely rotating stool holding two dumbbells, each of mass 2.99 kg (see figure below). When his arms are extended horizontally (Figure a), the dumbbells are 1.09 m from the axis of rotation and the student rotates with an angular speed of 0.752 rad/s. The moment of inertia of the student plus stool is 2.80 kg . m and is assumed to be constant. The student pulls the dumbbells inward horizontally to a position 0.293 m...
A student sits on a freely rotating stool holding two dumbbells, each of mass 3.04 kg...
A student sits on a freely rotating stool holding two dumbbells, each of mass 3.04 kg (see figure below). When his arms are extended horizontally (Figure a), the dumbbells are 1.02 m from the axis of rotation and the student rotates with an angular speed of 0.743 rad/s. The moment of inertia of the student plus stool is 2.58 kg .m2 and is assumed to be constant. The student pulls the dumbbells inward horizontally to a position 0.294 m from...
A student sits on a freely rotating stool holding two dumbbells, each of mass 3.05 kg...
A student sits on a freely rotating stool holding two dumbbells, each of mass 3.05 kg (see figure below). When his arms are extended horizontally (Figure a), the dumbbells are 0.96 m from the axis of rotation and the student rotates with an angular speed of 0.757 rad/s. The moment of inertia of the student plus stool is 2.68 kg m2 and is assumed to be constant. The student pulls the dumbbells inward horizontally to a position 0.291 m from...
A student sits on a freely rotating stool holding two dumbbells, each of mass 3.04 kg...
A student sits on a freely rotating stool holding two dumbbells, each of mass 3.04 kg (see figure below). When his arms are extended horizontally (Figure a), the dumbbells are 1.08 m from the axis of rotation and the student rotates with an angular speed of 0.755 rad/s. The moment of inertia of the student plus stool is 2.59 kg · m2 and is assumed to be constant. The student pulls the dumbbells inward horizontally to a position 0.306 m...
A helicopter has two blades (see figure), each of which has a mass of 250 kg and can be approximated as a thin rod of length 6.7 m. The blades are rotating at an angular speed of 53 rad/s. (a) What is the total moment of inertia of the two blades about the axis of rotation? (a) Determine the rotational kinetic energy of the spinning blades.
A helicopter has two blades (see figure), each of which has a
mass of 240 kg and can be approximated as a thin rod of length 6.7
m. The blades are rotating at an angular speed of 43 rad/s.
(a) What is the total moment of inertia of the two
blades about the axis of rotation? (a) Determine
the rotational kinetic energy of the spinning blades.
can
someone help me with questions 3 and 4 please !!
3. A machine part has the shape of a solid uniform sphere of mass 205 g and diameter 4.50 cm. It is spinning about a frictionless axle through its center, but at one point on its equator it is scraping against metal, resulting in a friction force of 0.0200 N at that point. Find its angular acceleration. Let the direction the sphere is spinning be the positive sense of...
A student sits on a freely rotating stool holding two dumbbells, each of mass 2.99 kg (see figure below). When his arms are extended horizontally (Figure a), the dumbbells are 1.09 m from the axis of rotation and the student rotates with an angular speed of 0.752 rad/s. The moment of inertia of the student plus stool is 2.80 kg . m and is assumed to be constant. The student pulls the dumbbells inward horizontally to a position 0.293 m...
A student sits on a freely rotating stool holding two dumbbells, each of mass 3.04 kg (see figure below). When his arms are extended horizontally (Figure a), the dumbbells are 1.02 m from the axis of rotation and the student rotates with an angular speed of 0.743 rad/s. The moment of inertia of the student plus stool is 2.58 kg .m2 and is assumed to be constant. The student pulls the dumbbells inward horizontally to a position 0.294 m from...
A student sits on a freely rotating stool holding two dumbbells, each of mass 3.05 kg (see figure below). When his arms are extended horizontally (Figure a), the dumbbells are 0.96 m from the axis of rotation and the student rotates with an angular speed of 0.757 rad/s. The moment of inertia of the student plus stool is 2.68 kg m2 and is assumed to be constant. The student pulls the dumbbells inward horizontally to a position 0.291 m from...
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