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For tests using a ballistocardiograph, a patient lies on a horizontal platform that is supported on jets of air. Because of the air jets, the friction impeding the horizontal motion of the platform is negligible. Each time the heart beats, blood is pushed out of the heart in a direction that is nearly parallel to the platform. Since momentum must be conserved, the body and the platform recoil, and this recoil can be detected to provide information about the heart. For each beat, suppose that 0.050 kg of blood is pushed out of the heart with a velocity of +0.25 m/s and that the mass of the patient and the platform is 75 kg. Assuming that the patient does not slip with respect to the platform, and that the patient and the platform start from rest, determine the recoil velocity.
80 pF capacitor and a 320 pF capacitor are both charged to 2.8 kV. They are then disconnected from the voltage source and are connected together, Find the resulting potential difference across each capacitor
q1. george of the jungle with mass m swings on a light vine hanging from a stationary tree branch. a second vine of
two point charges -2q and 3q are on the x-axis -2q at the origin and 3q at x d. choose the potential to equal zero at
Consider a fish of average size swimming near the bottom of a lake of depth 46 m. What is the water pressure next to the fish
High-speed stroboscopic photographs show that the head of a 200-g golf club is traveling at 45 m/s just before it strikes a 46-g golf ball at rest on a tee. Find the speed of the golf ball just after impact
A uniform plank of length 6m and weight 211N rests horizontally on two supports, with 1.1 m of the plank hanging over right support. To what distance x can a person who weighs 442N walk on the overhanging part of the plank before it just begins to..
A Doppler ultrasound machine uses a probe emitting ultrasound waves at 5MHz to probe the speed of blood cells moving in an artery, What is the wavelength through the soft tissue of ultrasound produced by this machine
Now assume the particle is a proton and that its initial velocity is 254.7 m/s to the right. If the magnitude of the magnetic field is 0.98 T
a sphere is constructed of two concentric pieces. The inner part is a solid sphere of radiu 10.0 cm made of a material with density 4000 kd/m^3. What is the average density of this sphere
Colonel John P. Stapp, USAF, participated in studying whether a jet pilot could survive emergency ejection. Determine the negative acceleration he experienced
On The Apollo 14 mission to the Moon, astronaut Alan shepard hit a golf ball with a 6 iron. For how much more time was the ball in flight
The skis have a thrust of 220 . Sam's speed at the bottom is 45.0. Illustrate what is the coefficient of kinetic friction of his skis on snow?
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