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On a day when the wind is blowing toward the south at 4 m/s, a runner jogs west at 0.8 m/s. What is the magnitude of velocity of the air relative to the runner? Calculate answer to one decimal.
What is the time necessary for crossing if the hunter wishes to move neither up- stream nor downstream while crossing the river? Answer in units of min.
At the Earth's surface a projectile is launched straight up with aspeed of 10.1 km/s. To what height will it rise. Ignore airresistance and the rotation of the Earth.
A stone with a mass of 0.80 kg is attached to one end of a string 0.900 m long. The string would break if its tension exceeds 600-N.
A certain nuclear power plant has an electrical power output of 430 MW. The rate at which energy must be supplied to the plant is 1,510 MW. What is the thermal efficiency of the power plant
A 0.1 kg block is attached to a spring with a constant 2.5 N/m and oscillates on a frictionless table. Its velocity is 0.2m/s when x=0.05. What is the amplitude of oscillations? What is the ball's maximum acceleration?
A point charge Q=+ 4.50uC is held fixed at the origin. A second point charge q=+ 1.30uC with mass of 2.10 x 10-4 kg is placed on the x-axis, 0.220m from the origin. What is its speed when its distance from the origin
The filament of a light bulb has a temperature of 3.48 x 103 °C and radiates 60.0 W of power. The emissivity of the filament is 0.253. Find the surface area of the filament
What is the mechanical advantage of a movable pulley, in which the load is directly attached to two segments of rope?
An Al-silicon dioxide-silicon MOS capacitor has an oxide thickness of 450Angstroms and a doping of Na=10^15 cm^-3. The oxide charge density is Q'ss=3x10^11cm^-2. Calculate (a) the flat-band voltage and (b) the threshold voltage. Sketch the electr..
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.80 x 104 m/s, and the radius of the orbit is 5.30 x 106 m. What is the orbital speed of the second satellite
A 1.09-cm-diameter microscope objective has a focal length of 2.4 mm. It is used in visible light with a wavelength of 516 nm. What is the objective's resolving power if used in air
A pipe open at both ends has a fundamental frequency of 300 Hz when the temperature is 0°C. What is the length of the pipe? What is the fundamental frequency at a temperature of 30°C?
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