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A 2.0 N force is applied to the plunger of a hypodermic needle. The diameter of the plunger is 1.2 cm and that of the needle is 0.30 mm.
(a) With what force does the fluid leave the needle?
(b) What force on the plunger would be needed to push fluid into a vein where the gauge pressure is 18 mm Hg? Answer for the instant just before the fluid starts to move.
During gym class, a 50-kg teenager runs at 8.0 m/s along the floor toward a rope hanging 7.8 m from the ceiling. What is the tension in the rope at the moment he begins to swing upward
Suppose a portable electric heater can be modeled by an Ohmic resistor. If the heater requires 600 Watts to operate, calculate the voltage drop across the heater
A proton, initially traveling in the +x-direction with a speed of 5.00×105m/s, enters a uniform electric field directed vertically upward, What is the strength of the electric field
q1. a motorist travelling with constant velocity of 15 ms about 34 mph passes a school crossing corner where the speed
A projectile is fired from the edge of a 10m high cliff at 10m/s and an angle of 30 degrees from the horizontal. what is the magnitude of the final velocity
A microphone is located on the line connecting two speakers that are 0.766 m apart and oscillating 180° out of phase. What is the next lowest frequency that produces an interference maximum at the microphone's location
Two small charges with a mass of 1.0 g each are connected by a 2.0 cm long insulating rod of negligible mass. What is the dipole moment of the rod
With what velocity does the wrench strike the ground. What is magnitude and direction of the boat's acceleration? Enter a positive answer for a direction due west, or a negative answer for a direction due east.
Suppose wire A and wire B are made of different metals, and are subjected to the same electric field in two different circuits. How many electrons enter wire B every second
Speedboat A negotiates a curve whose radius is 150m. Speedboat B negotiates the curve whose radius is 190m. Each boat experiences the same centripetal acceleration. What is the ratio vA/vB of the speeds of boats.
An electron of mass 9.11E-31 kg has an initial speed of 3E5 m/sec. It travels in a straight line and its speed increases to 7E5 m/sec in a distance of 5.0 cm. What is the force on the electron
A particle of mass 7.22 x 10^-27 kg, moving at 7.06 x 10^5 m/s, strike an identical particle which is initially at rest. What are the final speeds of the particles
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