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A 10.0 kg uniform ladder that is 2.50 m long is placed against a smooth vertical wall and reaches to a height of 2.10 m, as shown in the figure. The base of the ladder rests on a rough horizontal floor whose coefficient of static friction with the ladder is 0.800. An 80.0 kg bucket of concrete is suspended from the top rung of the ladder, right next to the wall, as shown in the figure. What is the magnitude of the friction force that the floor exerts on the ladder?
A 10 g bullet traveling at 430m/s strikes a 13kg , 1.1-m-wide door at the edge opposite the hinge, What is the angular velocity of the door just after impac
the note middle c on a piano has a frequency of 512 hz in the fundamental tone. suppose that the string that produces
A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 655 m/s. What is the horizontal distance between the end of the rifle and the bull's-eye
A 4.30 capacitor that is initially uncharged is connected in series with a 7.90 resistor and an emf source with 225 negligible internal resistance. what is the voltage drop across the capacitor
A fish uses an internal organ known as a swim bladder to change itsdensity so that it is equal to that of water, enabling it to remainsuspended under water
A person has a mass of 63 kg. The person is standing at sea level on earth. Determine the weight of this person using Fw=mg
A bat can detect very small objects, such as an insect whose length is approximately equal to one wavelenth of the sound the bat makes. what is the smallest insect the bat can detect
dolphins communicate using sound waves underwater. suppose a dolphin emits a sound wave with frequency 660 hz while
Fusion reactors attempt to utilize the same nuclear reaction that occurs within the sun. Two deuterium nuclei will combine together to form helium if they are close enough, How fast must the deuterium nuclei be going to touch
If gravitational forces alone prevent a spherical, rotating neutron star from disintegrating. Evaluate the minimum mean density of a star that has a rotation period of one millisecond
A model rocket is fired vertically from rest. It has a net acceleration of 18.5 m/s2. Ignoring air resistance, how high does the rocket travel
what is the translational rms speed of carbon dioxide molecules.
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