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An ice skater is gliding horizontally across the ice with an initial velocity of +7.14 m/s. The coefficient of kinetic friction between the ice and the skate blades is 0.0631, and air resistance is negligible. How much time elapses before her velocity is reduced to +2.42 m/s?
A car weighing 1.09 104 N is at rest on a 30.5° incline. Each wheel bears an equal part of the car's weight. Find the frictional force exerted by the road on each wheel
a single slit forms a diffraction pattern with the first minimum at an angle of 40 deg from central maximum.
A double slit is opposite the center of a 1.7-m wide screen 1.9 m from the slits. How many fringes are visible on the screen if the slit is illuminated by 648-nm light
Discuss what is meant by line spectra and what information can be gathered from a line spectrum plot
A playground carousel is free to rotate about its center on frictionless bearings, and air resistance is negligible. What is the person's mass
Extreme-sports enthusiasts have been known to jump off the top of El Capitan, a sheer granite cliff of height 910 m in Yosemite National Park. How long is the jumper in free fall
The neutrons in a parallel beam, each having kinetic energy 0.022 eV, are directed through two slits 0.40 millimeter apart. Determine how far apart will the interference peaks be on a screen 1.4 meter away
An artificial satellite circles the Earth in a circular orbit at a location where the acceleration due to gravity is 5.24 m/s^2.
A light beam with wavelength 440. nm in a material then enters air and its wavelength becomes 577. nm. What is the index of refraction for the material
A rock is dropped off the side of a bridge and hits the water below 7.5 s later. What was the rock's velocity when it hit the water
A molecule of DNA (deoxyribonucleic acid) is 2.07 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. Determine the effective spring constant of the molecule
A 10cm long animal tendon was found to stretch3.8mm by a force of13.0N. The tendon was approximately round with an average diameter of 8.0mm
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