Aspeed trap is set up with two pressure-activated
stripsplaced across a highway, 110 m apart. a car is speeding
alongat 33m/s, while the speed limit is 21 m/s. at the instant
thecar activates the first strip, the driver begins slowingdown.
what minimum deceleration is needed in order that theaverage speed
is within the limit by the time the car crosses thesecond
marker?

It may seem strange that the selected velocity does not depend on either the mass or the charge of the particle. (for example, would the velocity of a neutral particle be selected by passage through this device? ) the explanation of this is that the mass and the charge control the resolution of the device--particles with the wrong velocity will be accelerated away from the straight line and will not pass through the exit slit. if the acceleration depends strongly on the velocity, then particles with just slightly wrong velocities will feel a substantial transverse acceleration and will not exit the selector. because the acc

Along wire of diameter 1 mm is submerged in an oil bath of temperature ∞ 31°c. the wire has an electrical resistance per unit length of 0.01 ω/m. if a current of 103 a flows through the wire and the convection coefficient is 500 w/m2·k, what is the steady-state temperature of the wire? from the time the current is applied, how long does it take for the wire to reach a temperature that is within 1°c of the steady-state value? the properties of the wire are 8000 kg/m3, 500 j/kg·k, and 20 w/m·k.

Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class