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Q. A uniform door weighs 46-N and is 0.9 m wide and 2.5 m high. What is the magnitude of the torque because of the door's own weight about a horizontal axis perpendicular to the door and passing through a corner?
Consider a large parallel plate capacitor with circular plates of radius R. suppose that the electric field between the plates is increasing.
A 3.60 {rm m}-long, 430 {rm kg} steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 66 {rm kg} construction worker stands at the far end of the beam.
A hunter aims directly at a target (on the same level) 113 m away. If the bullet leaves the gun at a speed of 255 m/s, by how much will it miss the aim.
As part of a safety investigation, two 1700kg cars travelling at 25 m/s are crashed into different barriers. Find the average forces exerted on (a) car that hits a line of water barrels and takes 1.3 seconds to stop, and (b) car that hits a concrete ..
How to find out an initial speed of the bullet
Falls resulting in hip fractures are a major cause of injury and even death to the elderly. Typically, hip's speed at impact is about 2. If this can be reduced to 1.30 or less, hip will usually not fracture. One way to do this is by wearing elasti..
An observer, whose eyes are 1.92m above the ground, is standing 31 m away from a tree. The ground is level and the tree is growing perpendicular to it. The observer's line of sight with the treetop makes an angle of 21° above the horizontal. How t..
What is velocity relative to the ice surface
What must be the value of the putty mass m so that the amplitude after the collision is one-half the original amplitude.
Calculate the y-component of the magnetic force. How fast must the candy bar travel to have the same joules in the form of kinetic energy.
what is the acceleration of the wallet. If the contact between ball and ground lasted 1.6ms, what average force was exerted on ball.
A 0.39 kg iron horseshoe that is initially at 745°C is dropped into a bucket containing 24 kg of water at 46°C. What is the final equilibrium temperature? Neglect any heat transfer to or from the surroundings.
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