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Jo has a test for a nasty disease. We denote Jo's state of health by the variable a and the test result by b.
The result of the test is either ‘positive' (b = 1) or ‘negative' (b = 0); the test is 95% reliable: in 95% of cases of people who really have the disease, a positive result is returned, and in 95% of cases of people who do not have the disease, a negative result is obtained. The final piece of background information is that 1% of people of Jo's age and background have the disease.OK - Jo has the test, and the result is positive. What is the probability that Jo has the disease?
a vector representing 170 n is oriented at 32 degrees with the horizontal. what is the magnitude of its horizontal
A Van de Graaff accelerator is essentially a parallel plate capacitor. Such a machine is changed by an electrical potential of 2.5 x 10^6 volts. What is the energy density stored in the field
An electron traveling with a velocity of 6.0 *105 m/s along the direction enters a uniform magnetic field of 0.60 T pointing in the direction. Calculate the magnitude of the force on the electron
Assuming the losses in the nozzle of the form 0.04 V2/(2g), perfect velocity conditions between the water jet and the runner velocity, the water spreads at β° from the runner blades and neglecting the losses on the runner blades, determine:
A plane accelerates from rest at a constant rate of 5.00m/s2 along a runway that is 1800m long. What is the time t needed to take off
A Ferris wheel with a radius of 7.7 m rotates at a constant rate, completing one revolution every 37 s, Find the direction and magnitude of a passenger's acceleration when at the bottom of the Ferris wheel
Suppose that a sprinter is capable of an acceleration of 4 m/s2 over the first 14 m, and from then on runs at top speed. Determine what is her time for the 100 m sprint
A 16.1-kg sled is being pulled across a horizontal surface at aconstant velocity. The pulling force has a magnitude of 77.5 N andis directed at an angle of 29 ° above the horizontal. Determinethe coefficient of kinetic friction.
A spring, of negligible mass and which obeys Hooke's Law, supports a mass M on an incline which has negligible friction. The figure below shows the system with mass M in its equilibrium position. The spring is attached to a fixed support at P. The..
A Carnot air conditioner takes energy from the thermal energy of a room at 70 degrees F and transfers it as heat to the outdoors,which is at 96 degrees F. For each joule of electric energyrequired to operate the air conditioner, how many joules arere..
An engine does 17600 J of work and rejects 5740 J of heat into a cold resevoir whose temperature is 290 K. What would be the smallest possible temperature of the hot resevoir?
When a person inhales, air moves down the bronchus (windpipe) at 14 cm/s. determine the pressure drop in the constriction
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