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A 80-kg snow skier is being pulled up a 16 ° slope by a steel (Young's modulus 2.0 x 10^11 N/m2) cable. The cable has a cross-section area of 7.0 x 10^-5 m2. The cable applies a force to the skier, and, in doing so, the cable stretches by 2.9 x 10^-4 m. A frictional force of magnitude 59 N acts on the skis and is directed opposite to the skier's motion. If the skier's acceleration up the slope has a magnitude of 1.4 m/s2, what is the original (unstretched) length of the cable?
A gas is expanded from a volume of 1.0 L to 2.8 L at a constant pressure of 3.0 atm Find the net work done during the complete cycle
A high-speed flywheel in a motor is spinning at 450 rpm when a power failure suddenly occurs. The flywheel has mass 40.0 kg and diameter 72.0 cm. How many revolutions would the wheel have made during this time
An electron is in the fifth Bohr orbit of hydrogen. Calculate the time required for the electron to circle the nucleus
A microscope has an objective that has a focal length equal to 6.6 mm. what is the laternal magnification of the objective
An ideal gas initially at 20°C and 199 kPa has a volume of 3.40 L. It undergoes a quasi-static, Find the heat added to the gas during the expansion
An x-ray beam with wavelength 0.270nm is directed at a crystal. What is the spacing d between the planes of the crystal
q1. a small statue in the shape of a falcon is painted black and has a weight of 24.1 n. the owner of the statue claims
An observer, whose eyes are 1.92m above the ground, is standing 31 m away from a tree. The ground is level and the tree is growing perpendicular to it. The observer's line of sight with the treetop makes an angle of 21° above the horizontal. How t..
A proton (mass 1.67 x 10^-27 kg) is moving at 1.30 x 10^-6 m/s directly toward a stationary helium nucleus (mass 6.64 x 10-27 kg ). what is the proton's velocity
Upon being struck by 240 nm photons, a material ejects electrons with a maximum kinetic energy of 2.58 eV
what are the dimensions of the box as measured by an observer moving with a speed of 0.82 c parallel to one of the
A 202 kg cart runs into the rear end of a 103 kg cart that is stationary. what is the speed of the cart before collision
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