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Running indoors on a treadmill is slightly easier than running outside because you aren't moving through the air and there is no drag force to oppose your motion. A 65 kg man is running at 4.5 m/s on an indoor treadmill. To experience the same intensity workout as he'd get outdoors, he tilts the treadmill at a slight angle, choosing the angle so that the component of his weight force down the ramp is the same as the missing drag force.What is the necessary angle? The cross-section area is 0.72 m2 and the density of air is 1.20 kg/m3.
Consider a container with a partition in the middle. The container is thermally isolated from the environment. Initially one half of the container is filled with gas A (N molecules) and the other half with gas B (also N molecules).
The asymptotic wavelength
Netrons are slowed down to thermal energies in a 1:1 mixture of H2O and Uranium(4 atom % U-235,96 atom % U-238). Estimate the probability that a 0.0253 eV neutron will have scattering collision with H2O.
A 222 kg iceboat (like a boat on skates) glides with initially velocity 3.33 m/s northward across a frozen lake where m= 0.10. The wind then exerts on the boat a constant force of 444 N, 67.5° (i.e. NNE) as the boat travels 111 m, 90.0° (i.e. due no..
A singly ionized 24Mg ion (mass 3.983 10-26 kg) is accelerated through a 2.8 kV potential difference and deflected in a magnetic field of 500 G in a mass spectrometer. Find the radius of curvature of the orbit for the ion
A flight attendant pulls her 63N flight bag a distance of 312m along a level airport floor at a constant velocity. The force she exerts is 39N at the angle of 59° above the horizontal.
A car is going around a circular banked road (the banking angle is15 degree). The coefficient of static friction among the rubber and the road is 0.7. The radius of this part of the road is 25m.
Some amusement park rides move you back and forth in the horizontal direction. Why is this motion so much more disturbing to your body than cruising at a high speed in a jet airplane.
a wire with a circular cross section and a resistance r is lengthened to 8.86 times its original length by pulling it
Strontium 90Sr38 has a half-life of 28.5 yr. How long (in years) will it take for 90.9900% of the 90Sr38 released in a nuclear reactor accident to disappear
Find a geometrical arrangement of one proton and two electrons such that the potential energy of the system is exactly zero. How many such arrangements are there with the three particles on the same straight line? You should find that the ratio..
A flywheel has a constant angular deceleration of 2.2 rad/s2. Find the time for the flywheel to come to rest
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