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A standard interior staircase has steps each with a rise (height) of 20 cm and a run (horizontal depth) of 25 cm. Research suggests that the stairs would be safer for descent if the run were, instead, 31 cm. For a particular staircase of total height 5.80 m, how much farther (in m) would the staircase extend into the room at the foot of the stairs if this change in run were made?
The Kinetic coeffficient of friction for a 12Kg mass on a table is 0.25. A string from the mass goes across a pulley and is attached to an 8.0kg mass hanging over the side of the table. find the magnitude of the acceleration of each mass
A solenoid is constructed having 350 turns of wire and is 62.0 cm in length. A single hanging wire is positioned vertically at the end of the solenoid, what is the magnitude of the force on the wire
Three metal fishing weights, each with a mass of 1.00x102 g and at temperature of 100oC, are placedin 1.00x102g of water at 35oC. The final temperature of the mixture is 45.0oC. What is the specific heat of the metal in the weights?
As morning sunlight falls on a tethered helium balloon, it expands from a volume of 1.10 cross 103 m3 to a volume of 1.17 cross 103 m3. how much does the helium's internal energy increase
A guitar string is 93 cm long and has a mass of 3.6 g. The distance from the bridge to the support post is L = 60 cm, What is the frequency of the second overtone
A 4.4 cm tall object is placed 27 cm in front of a convex spherical mirror. Find the distance, di, of the image (cm), the focal length of the mirror (cm), and the radius of curvature of the mirror (cm)
A positron (q = +e) moves at 3.2 multiply.gif 107 m/s in a magnetic field of magnitude 0.46 T. What is the angle between the velocity and the field
A man ties one end of a strong rope 7.64 m long to the bumper of his truck, 0.505 m from the ground, and the other end to a vertical tree trunk at a height of 3.90 m. Compute the magnitude of the torque on the tree
Only about 5 % of the energy in the universe is composed of baryonic matter. Estimate the density of dark matter in the universe
The right-side rearview mirror of Mike's car says that objects in the mirror are closer than they appear. What is the focal length of the rearview mirror
A 225-m length of wire stretches between two towers and carries a 180-A current. Determine the magnitude of the force on the wire due to the Earth's magnetic field
If we make the approximation that the Earth's atmosphere is isothermal, with T=290K, what is the mass of the Earth's atmosphere. What is the ratio of the mass of Earth's atmosphere to the total mass of the Earth
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