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The driver of a car that has a mass of 1400 kg is coasting down a hill. He sees a stop sign at the bottom of the hill. His speed when he begins to brake is 28m/s and he is 200 m from the stop sign up the hill which has a grade of 10 percent. How much energy, in the form of heat, should his brakes dissipate to bring him to a full stop? Neglect wind and other frictional resistance.
a recording engineer works in a soundproof room that is 44.0 db quieter than the outside. if the sound intensity in the room is 1.20 x 10^-10 w/m^2, what is the intensity outside
a 0.346kg glider moves along a frictionless level air track tugged by a mass of 0.050kg suspended vertically over a pulley
A damping force acts on the egg, and the amplitude of the motion decreases to 0.101 in a time of 5.00 compute the magnitude of the damping constant b.
A beam of light is incident from air on the surface of a liquid. If the angle of incidence is 29.5°, find the critical angle for the liquid when surrounded by air
At what angle to the surface must a submerged diver in the lake look toward the surface to see the setting sun just along horizon.
Several bacteria are propelled by motors that spin hair-like flagella. A characteristic bacterial motor turning at a constant angular velocity has a radius of 1.9x10 -8 m, and a tangential speed at the rim of 2.9x10 -5 m/s. (
A photovoltaic cell can produce an average of 40 Wm^-2 (Watts permeter squared) of electrical energy if it is directly facing thesun at the equator.
Assume the volume of the tank and the temperature of gas remain constant all through this operation.
When at cruising altitude, a typical airplane cabin will have an air pressure equivalent to an altitude of about 2510 m. During the flight, what is the net force on one ear drum due to this pressure difference
A ski jumper leaves the ski track moving in the horizontal direction with a speed of 25.0 m/ s. Obtain the velocity when the jumper lands
An atomic nucleus of mass 288 u moving at 405m/s emits an alpha particle of mass 4.0 u in the direction of its velocity. If the remaining nucleus slows to 360m/s, what velocity does the alpha particle have when it is emitted.
Two point charges q1= 5.00x10^-6C and q2= -3.0x10^-6C are located on x-axis at x1= -0.4m and x2=0.6m, Find the electric field and the electric potential at the origin
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