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Running on a treadmill is slightly easier than running outside because there is no drag force to work against. Suppose a 60 kg runner completes a 5.0 km race in 18 minutes. Determine the drag force on the runner during the race. Suppose that the cross section area of the runner is 0.72 m2 and the density of air is 1.2 kg/m3. What is this force as a fraction of the runner's weight?
A 45.0 g ball of copper has a net charge of 2.1 µC. What fraction of the copper's electrons have been removed
Water has a mass per mole of 18.0 g/mol, and each water molecule (H2O) has 10 electrons. What is the net charge of all these electrons
A non-relativistic electron and a non-relativistic proton, of rest masses me and mp, have equal kinetic energies. What is the ratio of the de Broglie wavelength of the electron, le, to that of the proton, lp? Get an algebraic, rather than numerical, ..
At the top of Earth's atmosphere, sunlight has an average intensity of 1380W/m^2 .If the average distance from Earth to the Sun is 1.5*10^11m, at what rate does the Sun radiate energy?
A golf ball is a struck with a club. The force in the ball varies from zero when contact is made up to maximum value, What is the mass of the golf ball
A 1500 kg car is driven onto a pair of ramps so that it fronts wheels have been raised 0.3 m above the rear wheels. How much of the car's weight is supported by the rear wheels
A 5 cm tall object is placed 20 cm to the left of a converging lens with focal length of 10 cm. What is the magnification of the image
A point charge at the origin of a coordinate system produces the electric field E = (36000 N/C)x on the x axis at the location x = -0.50 m.
Piano tuners tune pianos by listening to the beats between the harmonics of two different strings. When properly tuned, the note A should have a frequency of 440 Hz and the note E should be at 659 Hz.
How much heat must be added to 1 mole of a monatomic gas if the temperature goes to -10.0 degrees C to 30.0 degrees C at A) constant volume B) constant pressure?
A string with both ends held fixed is vibrating in its third harmonic. The waves have a speed of 193m/s and a frequency of 240Hz. The amplitude of the standing wave at an antinodes is 0.440cm .
Magnus has reached the finals of a strength competition. In the first round, he has to pull a city bus as far as he can. One end of a rope is attached to the bus, how much work does the tension force do on Magnus
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