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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 +0.30 m/s and that the mass of the patient and the platform is 80 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.
A car traveling at 21 {rm m/s} runs out of gas while traveling up a 25^circ slope. How far up the hill would it coast before starting to roll back down.
A 140 ? lamp, a 25 ? electric heater, and a 57 ? fan are connected in parallel across a 137 V line. What is the current of the lamp
One way to attack a satellite in Earth orbit is to launch a swarm of pellets in the same orbit as the satellite but in the opposite direction. Suppose a satellite in a circular orbit 360 km above Earth's surface collides with a pellet having mass ..
A 40 kg child sits in a swing suspended with 2.5 m long rope. Use energy conservation to determine the speed the child will have at the bottom of the arc when she is let go
You are an engineer in charge of designing a new generation of elevators for a prospective upgrade to the Empire State Building. Before the state legislature votes on funding for the project, they would like you to prepare a report on the benefits..
The electric output of a power plant is 730MW . Cooling water flows through the power plant at the rate 1.30 ×108L/hr. What is the power plant's thermal efficiency
An arrow is shot off the top of a bridge of unknown height. The speed of the arrow at launch is known to be 30.0 m/s. How tall is the bridge
If you weigh 690 N on the earth, what would be your weight on the surface of a neutron star that has the same mass as our sun and a diameter of 25.0 km.
A coin placed 29.0 cm from the center of a rotating, horizontal turntable slips when its speed is 50.2 cm/s, What is the coefficient of static friction between coin and turntable
A horizontal wire of length 0.58 m, carrying a current of 7.2 A, is placed in a uniform external magnetic field, Determine the magnitude of the external magnetic field
An outside loudspeaker (considered a small source) emits sound waves with a power output of 120 W. Find the intensity level in decibels at that distance
What is the fundamental resonant frequency of the air column if the velocity of sound in the air is 340 m/s.
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