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The bright star Antares in the Constellation Scorpius emits the greatest intensity of radiation at a wavelength of 853 nano meters. what is the surface temperature of Antares? What color is that star.
here is a point on the x-axis between the two charges where the electric field is zero. Find out the location of the point where the electric field is zero.
The position of a 9x10-31kg particle is given by: x(t)=3t2x+4ty where x and y are unit vectors. What is the force acting on the particle
A fire hose discharges water at a rate of 20.5 kg/s with a speed of 29.9 m/s. Find what magnitude of force is needed to keep the hose stationary
radio waves travel at the speed of light which is 3x108 ms. how many minutes does it take for a radio message to reach
Consider the mass spectrometer shown schematically in the figure below. The electric field between the plates of the velocity selector is 5900 V/m, Calculate the radius r of the path for a singly charged ion
A builder will use wood for floor support in building a house. The Young's modulus for this wood is 12 x 10^9 Newtons/meter^2. What would be the length of wood joists if the sag is not more than 25ft
A student on a piano stool rotates freely with an angular speed of 3.05 rev/s. Calculate the initial kinetic energy of the system
The speed of sound in air at 0 degrees C is 331 m/s. If the density of air is 1.29 kg/m^3, then what is the bulk modulus of air
A solenoid has a radius of 1.87 cm and 1080 turns per meter. Over a certain time interval the current varies with time according to the expression I = 2.91e0.2t, Calculate the electric field 4.54 cm from the axis of the solenoid
Suppose Q and nQ are charges that are seperated from origin by -L and oL and the origin and that the origin as at a point of electrostatic equilibrium between them
A car rounds a circle of radius 180 m , going at 14.5 m/s. What's the car's acceleration if its speed is constant. Compute the new acceleration if the speed is increasing at a rate of 2.4 m/s^2
A disk, initially rotating at 149 rad/s, is slowed down with a constant angular acceleration of magnitude 4.23 rad/s2. (a) Explain by how much time does the disk take to stop? (b) Through what angle (rad) does the disk rotate during that time?
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