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A neutron star is the remnant left after certain supernovae (explosions of giant stars). Typically, neutron stars are about 20 in diameter and have around the same mass as our sun. What is a typical neutron star density?
A person on a safari wants to take a photograph of a hippopotamus from a distance of 78.8 m. The animal is 4.90 m long and its image is to be 1.24 cm long on the film. What focal length lens should be used
In very cold weather, a significant mechanism for heat loss by the human body is energy expended in warming the air taken into the lungs with each breath. How much heat is lost per hour if the respiration rate is 19.0 breaths per minute
A segment of wire carries a current of 20 A along the x-axis from y=2.0 m to y=0 and then along the x axis from x=0 to x=-4.0 m. What is the magnitude of the force on this segment of wire
A certain ac signal at 60 Hz is applied across a 40-mH inductor and a 200-? resistor. What is the power factor of this circuit
A block of mass M=100 kg is moving down an incline that makes an angle of 30 degrees relative to the horizontal. How much work is done by friction during this process
A thin double-convex lens is intended to focus the image of an object onto a screen so that the image is life-sized on the screen. find the total distance between the object and the image
An electric heater carries a current of 16.5 A when operating at a voltage of 1.50 102 V. What is the resistance of the heater
Calculate the force needed to stop the downward motion of a jogger's leg, if his leg has a mass of 12.0 kg, a speed of 6.00 m/s
A skier leaves the ramp of a ski jump with a velocity of 30.0 m/s The slope is inclined at 50.0°, Find the distance from the ramp to where the jumper lands
If astronauts could travel at v = 0.950c, we on Earth would say it takes (4.20 / 0.950) = 4.42 years to reach Alpha Centauri, 4.20 light-years away. How much time passes on the astronauts' clocks
If the first-order maximum for pure wavelength light falling on a double slit is at an angle of 10.0 degrees, What is the angle of the first minimum
Calculate the force on an airplane which has acquired a net charge of 1650 µC and moves with a speed of 130 m/s perpendicular to the Earth's magnetic field of 5.0 *10^-5T
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