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On a day when the temperature is 20.0°C, a concrete walk is poured in such a way that its ends are unable to move.
(a) What is the stress in the cement when its temperature is 50.0°C on a hot, sunny day?
(b) Does the concrete fracture? Take Young's modulus for concrete to be 7.00 × 109N/m2and the compressive strength to be 2.00 × 107N/m2.
A fly wheel rotates with an angular speed of 25 rev/s. As it is brought to rest with a constant acceleration, it turns 50 rev. Determine how much time does it take to stop
a simple pendulum makes 120 complete oscillations in 3.00 min at a location where g 9.80 ms2. find a the period of the
In addition, snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. Find out the acceleration of the sled and child.
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A sled of mass 8 kg is on a frictionless slope inclined at 35degrees to the horizantal.It is pulled by a rope that makes anangle of 10 degrees with the slope,the tension in the rope is 40N. Find the accerelation of the sled take up the slope as thepo..
From the difference in mass of a hydrogen atom (Appendix B) to the mass of a proton and an electron (Table 1.5), estimate the binding energy of the electron in the hydrogen atom. Compare this to the ionization energy of the ground state electron a..
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 2.00×10^6 km, What is the total work done by the two tugboats on the supertanker
How much heat transfer is nec to raise the temp of a .200kg piece of ice from -20C to 130C including the energy needed for phase changes
A projectile is fired from the ground (you can assume the initial height is the same as the ground) in a field so there are no obstacles in its way. What is the maximum height that the projectile reaches
question the initial velocity of a 4.0kg box is 11ms due west. after the box slides 4.0m horizontally its speed is 1.5
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