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A 4.0m deep swimming pool measures 28m by 11m. It's filled with fresh water. What force does the water exert on the bottom of the pool?
A man is to pull a 50 .0 kg crate across a level terrain with a force of 50.0 N. What is the coefficient of kinetic friction, if the work done by friction is - 4.30 x 102 J
Suppose the peak of a particular star's spectrum occurs at about 6000 Å (Angstrom). (a) Use Wien's law to calculate the star's surface temperature. (b) If this star were a factor of four hotter, at what wavelength would its spectrum peak? In what ..
An electron is confined in a one-dimensional box (an infinite well). Two adjacent allowed energies of the electron are 1.068 × 10-18 J and 1.352 × 10-18 J. What is the length of the box
A person driving her car at 48 km/h approaches an intersection just as the traffic light turns yellow. The yellow light lasts only 2.0 s before turning to red, how far will she travel before stopping
A certain waffle iron is rated at1.03kW when connected to a 120-V source. What current does the waffle iron carry?
What is the separation between the two atoms in this molecule if we model them as point masses? The mass of hydrogen is 1.67* 10^-27 kg and nitrogen is 2.33*10^-26 kg
A car is going with a constant speed of 15 m/s (about 34 mph) in a school-crossing corner, where the speed limit is 10 m/s (about 22 mph). What is the distance traveled at that point
One gram-mole of an ideal gas initially occupies V1 = 5.0 L at P1 = 117 kPa, and then expands to V2 = 10.0 L at constant pressure. How much heat is absorbed (+) or liberated (-)
A figure skater is spinning at a rate of 1.2 rev/s with her arms outstretched. What is her new rate of rotation
Use Coulombs' law and integration to find the electric field inside a hollow cylindrical shell with surface charge density ps and surface radius a
q1. the loaded cab of an elevator has a mass of 3000 kg and moves 181 m up the shaft in 23 s at constant speed. at what
A hot-air balloonist, rising vertically with a constant velocity of magnitude v= 5.00 m/s, releases a sandbag at an instant when the balloon is a height h= 40.0 m above the ground. With what magnitude of velocity does it strike
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