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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 0.0492 kg of blood is pushed out of the heart with a velocity of +0.265 m/s and that the mass of the patient and platform is 65.5 kg. Assuming that the patient does not slip with respect to the platform, and that the patient and platform start from rest, determine the recoil velocity.
A rectangle has an area of 28.14 cm2. When both the length and width of the rectangle are increased by 1.80 cm, Calculate the length of the longer of the two sides of the initial rectangle
Radar is used to scan for airplanes near an airport. If an airplane is 10 km from the airport, what is the round-trip travel time for the electromagnetic wave used by the radar system
Practical steam engines utilize 450°C steam, which is later exhausted at 250°C. What is the overall efficiency of the two engines
A high-speed flywheel in a motor is spinning at 450rpm when a power failure suddenly occurs. The flywheel has mass 40.0kg and diameter 80.0cm. At what rate is the flywheel spinning when the power comes back on
The rotational velocity of a merry-go-round increases at a constant rate from 0.6 rad/sec to 1.8 rad/s in a time of 4 s. find the rotational acceleration of the merry-go-round
A charge of q = +7.22 ?C is located in an electric field. The x and y components of the electric field at this point are Ex = 6.48E+3 N/C, What is the magnitude of the force on the charge
A uniform conducting rod of length 28 cm has a potential difference across its ends equal to 13 mV (millivolts). What is the magnitude of the electric field inside the conductor
An electron with the initial speed of 4.00×10^5 is brought to rest by an electric field. What was the initial kinetic energy of electron, in electron volts.
A potter's wheel having a radius 0.48 m and a moment of inertia of 12.3 kg · m2 is rotating freely at 55 rev/min. Find the effective coefficient of kinetic friction between the wheel and the wet rag
How many J of energy must be removed when 156 g of steam, at a temperature of 175.0 °C, is cooled and frozen into 156 g of ice at 0 °C.
A uniform metal rod, with a mass of 3 {rm kg} and a length of 1.2 {rm m}, is attached to a wall by the hinge at its base. A horizontal wire bolted to the wall 0.51 m above the base of the rod holds the rod at an angle of 25{rm ^circ} above the hor..
Gasoline's thermal expansion coefficient is 9.5 x 10^-4(degree C^-1). A truck's 110 gallon (416.4 L) gas tank is full on a 14 degree C summer morning. How much gasoline spills from the tank due to thermal expansion
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