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Question
The Achilles tendon connects the muscles in your calf to the back of your foot. When you are sprinting, your Achilles tendon alternatively stretches, as you bring your weight down onto your forward foot, and contracts to push you off the ground. A 70 kg runner has an Achilles tendon that is 15 cm long with a typical 1.1×10-4 m2 cross-sectional area. By how much will the runner's Achilles tendon stretch if the maximum force on it is 8.0 times his weight, a typical value while running? (The Young's modules for a tendon is Y=0.15×1010 N/m2.)
A particle has a rest mass of 6.60 x 10-27 kg and a momentum of 2.16 x 10-18 kg • m/s. What is the total energy (kinetic plus rest energy) of the particle
Three identical capacitors are connected in parallel to a battery. If a total charge of Q flows from the battery, how much charge does each capacitor carry
Explain why you are safe and unaffected inside a car that is struck by lightning. Also explain why it might not be safe to step out of the car just after the lightning strike, with one foot in the car and one on the ground.
A spring is hung from the ceiling. A 0.509 -kg block is then attached to the free end of the spring. Find the angular frequency of the block's vibrations
A sample of helium behaves as an ideal gas as it is heated atconstant pressure from 273 K to 343 K. what is the mass of helium present
pitchers mounds are raised to compensate for the vertical drop of the ball as it travels a horizontal distance of 17 m
a proton moves perpendicular to a uniform magnetic field at a speed of 1.55 x 107 ms and experiences an acceleration of
a glass lens nglass 1.52 has a 139 nm thick anti-reflective film nfilm 1.29 on one side. light moving through the air
The transfer function of a dc motor (which acts as a plant whose input is the armature voltage and whose output is the shaft rotation angle).
A proton moves at a speed of 1,645 m/s in a direction perpendicular to a magnetic field with a magnitude of 0.73 T. how will the magnitude of the force change
A projectile is launched with an initial speed of 50 m/s at an angle of 35° above the horizontal, What is the projectile's velocity at the highest point of its trajectory
The pattern was recorded by using a neutron detector to measure the neutron internsity at different positions. determine how far the detector was behind the slits
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