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In a needle biopsy, a narrow strip of tissue is extracted from a patient using a hollow needle. Rather than being pushed by hand, to ensure a clean cut the needle can be fired into the patient's body by a spring. Assume that the needle has mass 5.60 g, the light spring has force constant 430 N/m, and the spring is originally compressed 8.35 cm to project the needle horizontally without friction. After the needle leaves the spring, the tip of the needle moves through 2.40 cm of skin and soft tissue, which exerts on it a resistive force of 7.60 N. Next, the needle cuts 3.50 cm into an organ, which exerts on it a backward force of 9.20 N.
(a) Find the maximum speed of the needle.
____________m/s
(b) Find the speed at which a flange on the back end of the needle runs into a stop that is set to limit the penetration to 5.90 cm.
______________m/s
A man of mass 91 kg drops to a concrete patio from a window 0.63 m above the patio. What is the magnitude of the average stopping force exerted on him by the patio
A particle has an acceleration of 6.19 m/s^2 for 0.350 s . At the end of this time the particle's velocity is 9.26 m/s What was the particle's initial velocity?
Calculate the absolute pressure at the bottom of a fresh-water lake at a depth of 31.2 m. Assume the density of the water is 1.00 103 kg/m3 and the air above is at a pressure of 101.3 kPa
Write down the expression that shows the pressure
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An open flask sitting in a lab fridge looks empty, but we know that actually it is filled with a mixture of gasses called air. how many gas molecules does the flask contain
A plastic ball in a liquid is acted upon by its weight and by a buoyant force. The weight of the ball is 4.8N. The buoyant force has a magnitude of 6.5N and acts vertically upward. External force acting on the ball maintains it in the state of res..
A car moves with an initial velocity of 5m/s and is subjected to a deceleration of 3m/s2 for 2 seconds. Calculate the distance the car traveled
A photon with energy 1.85 eV is absorbed by a hydrogen atom. Find the speed of the electron released from the state in part (a) when it is far from the nucleus
How much work is required to pull him a distance of 58.0 m up a 27.0° slope (assumed frictionless) at a constant speed of 1.80 m/s
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