A safe door like the one in the picture can be modeled as a disk. It...
- A safe door like the one in the picture can be modeled as a disk. It has a mass of 500[kg], a radius of 1.0[m] and it swings open around an axle that goes through the edge of the disk shaped safe. Assume I=625 kg m^2. Assume the axle is frictionless
Assuming that a very strong thief is pulling the door open with 800[N], how long would it take for them to open the door ½ way, that is: by an angular displacement of p/2 radians? Assume he is pulling the door in its middle (the steering wheel).
Homework Answers
Answer is 1.566 seconds or 1.57 seconds.
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A safe door like the one in the picture can be modeled as a
disk. It...
A merry-go-round modeled as a disk of mass 100 kg and radius 2.0 m is rotating...
A merry-go-round modeled as a disk of mass 100 kg and radius 2.0 m is rotating around a frictionless vertical axle. After a person of mass 60 kg jumps onto the merry-go-round, the system’s angular speed decreases to 2.0 rad/s. If the person walks slowly from the edge toward the center, find the change in the system’s rotational kinetic energy caused by her movement to 0.5 m from the center.
please explain the question's in-depth. Severely confused Complete the 2 questions below. Question 1 Axle A...
please explain the question's in-depth. Severely confused
Complete the 2 questions below. Question 1 Axle A disk is attached to an axle, about which it can freely rotate without friction. The axle is parallel to the floor, and the disk has a mass of 4.30 kg and a diameter of 25.6 cm. The disk is held so that its centre of mass is as high as the axle, and then released from rest. What is the angular velocity of the...
PRACTICE IT Use the worked example above to help you solve this problem. merry-go-round modeled as...
PRACTICE IT Use the worked example above to help you solve this problem. merry-go-round modeled as a disk of mass M 9.00 x 10 kg and radius R = 2.50 m is rotating in a horizontal plane about a frictionless vertical axle (see figure) (a) After a student with mass m = 84.0 kg jumps onto the merry-go-round, the system's angular speed decreases to 1.95 rad/s. If the student walks slowly from the edge toward the center, find the angular...
Use the worked example above to help you solve this problem. A merry-go-round modeled as a disk of mass M -8.00 x 10 kg and radius R vertical axle (see figure). 2.20 m is rotating in a horizontal...
Use the worked example above to help you solve this problem. A merry-go-round modeled as a disk of mass M -8.00 x 10 kg and radius R vertical axle (see figure). 2.20 m is rotating in a horizontal plane about a frictionless (a) After a student with mass 88.0 kg jumps onto the merry-go-round, the system's angu speed decreases to 1.95 rad/s. If the student walks slowly from the edge toward the center, find the angular speed of the system...
1. Suppose an automobile engine can produce 185 N·m of torque, and assume this car is...
1. Suppose an automobile engine can produce 185 N·m of torque, and assume this car is suspended so that the wheels can turn freely. Each wheel acts like a 14 kg disk that has a 0.175 m radius. The tires act like 2.1 kg rings that have inside radii of 0.175 m and outside radii of 0.32 m. The tread of each tire acts like a 8.5 kg hoop of radius 0.325 m. The 15 kg axle acts like a...
Suppose an automobile engine can produce 220 N⋅m of torque, and assume this car is suspended so t...
Suppose an automobile engine can produce 220 N⋅m of torque, and assume this car is suspended so that the wheels can turn freely. Each wheel acts like a 15 kg disk that has a 0.155 m radius. The tires act like 1.8-kg rings that have inside radii of 0.18 m and outside radii of 0.305 m. The tread of each tire acts like a 12-kg hoop of radius 0.325 m. The 14-kg axle acts like a solid cylinder that has...
4) A 1 meter-long, funny-shaped meter stick has an unknown mass but a center of gravity...
4) A 1 meter-long, funny-shaped meter stick has an unknown mass but a center of gravity located at 0.75 m from the left end. When a metal wedge is placed at the middle of the bar and a .50-kg mass is hung from the left end, the bar balances perfectly on the metal wedge. a) Determine the mass of the funny-shaped meter stick (10 pts). b) Calculate the amount of upward force provided by the metal wedge (10 pts). 5)...
PRACTICE IT Use the worked example above to help you solve this problem. A merry-go-round modeled...
PRACTICE IT Use the worked example above to help you solve this problem. A merry-go-round modeled as a disk of mass M 7.00 x 101 kg and radius R vertical axle (see figure). 2.20 m is rotating in a horizontal plane about a frictionless (a) After a student with mass m 80.0 kg jumps onto the merry-go-round, the system's angular speed decreases to 2.10 rad/s. If the student walks slowly from the edge toward the center, find the angular speed...
PRACTICE IT Use the worked example above to help you solve this problem. A merry-go-round modeled...
PRACTICE IT Use the worked example above to help you solve this problem. A merry-go-round modeled as a disk of mass M 9.00 x 101 kg and radius R = 2.50 m is rotating in a horizontal plane about a frictionless vertical axle (see figure) (a) After a student with mass m 88.0 kg jumps onto the merry-go-round, the system's angular speed decreases to 2.10 rad/s. If the student walks slowly from the edge toward the center, find the angular...
Use the worked example above to help you solve this problem. A merry-go-round modeled as a disk of mass M 7.00 x 101 kg and radius R 2.40 m is rotating in a horizontal plane about a frictionless vert...
Use the worked example above to help you solve this problem. A merry-go-round modeled as a disk of mass M 7.00 x 101 kg and radius R 2.40 m is rotating in a horizontal plane about a frictionless vertical axle (see figure). (a) After a student with mass m 86.0 kg jumps onto the merry-go-round, the system's angular speed decreases to 1.95 rad/s. If the student walks slowly from the edge toward the center, find the angular speed of the...
please explain the question's in-depth. Severely confused
Complete the 2 questions below. Question 1 Axle A disk is attached to an axle, about which it can freely rotate without friction. The axle is parallel to the floor, and the disk has a mass of 4.30 kg and a diameter of 25.6 cm. The disk is held so that its centre of mass is as high as the axle, and then released from rest. What is the angular velocity of the...
PRACTICE IT Use the worked example above to help you solve this problem. merry-go-round modeled as a disk of mass M 9.00 x 10 kg and radius R = 2.50 m is rotating in a horizontal plane about a frictionless vertical axle (see figure) (a) After a student with mass m = 84.0 kg jumps onto the merry-go-round, the system's angular speed decreases to 1.95 rad/s. If the student walks slowly from the edge toward the center, find the angular...
Use the worked example above to help you solve this problem. A merry-go-round modeled as a disk of mass M -8.00 x 10 kg and radius R vertical axle (see figure). 2.20 m is rotating in a horizontal plane about a frictionless (a) After a student with mass 88.0 kg jumps onto the merry-go-round, the system's angu speed decreases to 1.95 rad/s. If the student walks slowly from the edge toward the center, find the angular speed of the system...
1. Suppose an automobile engine can produce 185 N·m of torque, and assume this car is suspended so that the wheels can turn freely. Each wheel acts like a 14 kg disk that has a 0.175 m radius. The tires act like 2.1 kg rings that have inside radii of 0.175 m and outside radii of 0.32 m. The tread of each tire acts like a 8.5 kg hoop of radius 0.325 m. The 15 kg axle acts like a...
4) A 1 meter-long, funny-shaped meter stick has an unknown mass but a center of gravity located at 0.75 m from the left end. When a metal wedge is placed at the middle of the bar and a .50-kg mass is hung from the left end, the bar balances perfectly on the metal wedge. a) Determine the mass of the funny-shaped meter stick (10 pts). b) Calculate the amount of upward force provided by the metal wedge (10 pts). 5)...
PRACTICE IT Use the worked example above to help you solve this problem. A merry-go-round modeled as a disk of mass M 7.00 x 101 kg and radius R vertical axle (see figure). 2.20 m is rotating in a horizontal plane about a frictionless (a) After a student with mass m 80.0 kg jumps onto the merry-go-round, the system's angular speed decreases to 2.10 rad/s. If the student walks slowly from the edge toward the center, find the angular speed...
PRACTICE IT Use the worked example above to help you solve this problem. A merry-go-round modeled as a disk of mass M 9.00 x 101 kg and radius R = 2.50 m is rotating in a horizontal plane about a frictionless vertical axle (see figure) (a) After a student with mass m 88.0 kg jumps onto the merry-go-round, the system's angular speed decreases to 2.10 rad/s. If the student walks slowly from the edge toward the center, find the angular...
Use the worked example above to help you solve this problem. A merry-go-round modeled as a disk of mass M 7.00 x 101 kg and radius R 2.40 m is rotating in a horizontal plane about a frictionless vertical axle (see figure). (a) After a student with mass m 86.0 kg jumps onto the merry-go-round, the system's angular speed decreases to 1.95 rad/s. If the student walks slowly from the edge toward the center, find the angular speed of the...
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