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A 1.0 N force is applied to the plunger of a hypodermic needle. The diameter of the plunger is 1.0 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 measure pressure is 18 mm Hg? Answer for the instant now before the fluid starts to move.
The capacitance of a cylindrical capacitor can be increased by:
For a particular collision you detect the emitted products and find 15 protons, 2 antiprotons, 6 positrons, and 25 neutral particles. How many electrons are also emitted?
At the instant the car begins to accelerate, a truck with a constant velocity of 21 m/s passes in the next lane. Explain how far will the car travel before it overtakes the truck?
An object with total mass mtotal = 15.8 kg is sitting at rest when it explodes into three pieces. One piece with mass m1 = 4.6 kg moves up and to the left at an angle of ?1 = 19.0° above the –x axis with a speed of v1 = 27.8 m/s.
A 68kg woman stands on a very light, rigid board that rests on a bathroom scale at each end. She is standing 1.5m from one scale, and, 0.5m from the other. What is the reading on each of the scales.
A rectangular wooden block measures 10.0 4.00 2.00 . When the block is placed in water, it floats horizontally, What is the density of the wood
A defensive lineman of mass M = 115 kg makes a flying tackle at vi \= 4.00 m/s on a stationary quarterback of mass m = 76 kg, calculate the shear stress exerted on the bone in the collision.
A spherical raindrop of mass 0.00942 g and radius 1.31 mm falls from a cloud that is at a height of 1115 m above the ground. What would be the raindrop's speed just before landing on the ground if there were no drag force
Seat belts and air bags save lives by reducing the forces exerted on the driver, A 58kg person is in a head-on collision. The car's speed at impact is 13m/s. Estimate the net force on the person if he or she is wearing a seat belt and if the air ..
A motorist drives along a stright road at a constant speed of 15.0 m/s. Just as she passes a parked motorcycle police officer starts to accelerate at 2.00 m/s2 to overtake her. Assuming the officer maintains this acceleration, the time it takes (in s..
In a game of basketball, a forward makes a bounce pass to thecenter. The ball is thrown with an initial speed of 4.8 m/s at an angle of 14.2° below the horizontal. It isreleased 0.67 m above the floor. What horizontal distance does the ball cover ..
Treating our rigid legged friend as a particle, what is the average force his feet exert on the ground while he slows down.
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