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A train has a length of 82 m and starts from rest with a constant acceleration at time t = 0 s. At this instant, a car just reaches the end of the train. The car is moving with a constant velocity. At a time t = 18 s, the car just reaches the front of the train. Ultimately, however, the train pulls ahead of the car, and at time t = 36 s, the car is again at the rear of the train. Find the magnitudes of the following quantities.
(a) the car's velocity ?
(b) the train's acceleration?
The filament of a light bulb has a temperature of 2.85E+3 °C and radiates 40 watts of power. The emissivity of the filament is 0.344. Find the surface area of the filament
A resistor with 325? and an inductor are connected in series across an ac source that has voltage amplitude 520V. What is the power factor
You are asked to design a spring that will give a 1310-kg satellite a speed of 3.50 m/s relative to an orbiting space shuttle, What must the force constant of the spring be
A 500 kg polar bear of average density 950 kg/m3 is stranded on a melting chunk of ice in the ocean. What is the smallest volume of ice that will keep the bear entirely above water
in a cloud chamber experiment a proton enters a uniform 0.340 t magnetic field directed perpendicular to its motion.
Find the magnitude of the potential difference between two points located 1.1m apart in a uniform 630 N/C electric field
Tsunamis are fast-moving waves often generated by underwater earthquakes. In the deep ocean their amplitude is barely noticeable, What was the speed (in m/s) of the wave
A hollow sphere of inner radius 7.1 cm and outer radius 9.7 cm floats half submerged in a liquid of density 510 kg/m3. Calculate the density of the material of which the sphere is made
Pick what you think are the most reasonable choices for each parameter in the Drake equation and justify your choice. estimate the likely nearest distance to such a civilization
question a proton beam in an accelerator carries a current of 115 microa. if the beam is incident on a target how many
A man normally consumes 8.4 MJ of food energy per day. He then begins running a distance of 9km four times per week. If he expends energy at the rate of 450W while running at 12 km/h , how much more food energy should he consume daily in order to mai..
A ball of mass 0.25 kg is attached to a string 0.750 m long. The ball is swung in a pendulum-type motion such that it has a speed of 6.40 m/s, What is the corresponding tension in the string
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