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A 60kg sprinter starts from rest and reaches a speed of 8.5m/s in 1.8s. During this time there is negligible air resistance. The sprinter then runs the remainder of the race at a constant 8.5m/s with a resistance force of 52N due to wind.
a) How much power must the runner produce during the acceleration phase?
b) How much power must the runner produce during the constant phase?
A 94.0-μF capacitor is connected to a generator operating at a low frequency. The rms voltage of the generator is 4.10 V and is constant. A fuse in series with the capacitor has negligible resistance and will burn out when the rms current reaches ..
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A cubical block of wood 10cm on a side, floats at the interface between oil and water with its lower surface 1.50 cm below the surface
question1a cylindrical 3.52 kg pulley with a radius of 0.360 m is used to lower a 4.45 kg bucket into a well. the
Doppler ultrasound can be used to measure blood flow rate. What is the frequency of ultrasound reflected by moving red blood cells
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