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Neutron stars consist only of neutrons and have unbelievably high densities. A typical mass and radius for a neutron star might be 7.9 x 1028 kg and 1.7 x 103 m. (a) Find the density of such a star. (b) If a dime (V = 2.0 x 10-7 m3) were made from this material, how much would it weight (in pounds)?
Two bullets have masses of 2.9 gand 4.2 g, respectively. Each is fired with a speed of 42.0m/s. What is the kinetic energy ofthe first bullet?
An incident X-ray photon of wavelength 0.2800 nm is scattered from an electron that is initially at rest. find the momentum gained by the electron
An optometrist prescribes contact lenses that have a focal length of 56.0 cm. Where is the unaided near point of the person located
A student (m = 63 kg) falls freely from rest and strikes the ground. During the collision with the ground he comes to rest in a time of 0.040 s. From what height did the student fall
A parachutist with mass 86.0 kg jumps from an airplane traveling at a speed vi=112 km/hr at a height H=2570 m. He lands with a speed of vf=5.21 m/s.
If an airplane accelerates at 10 m/s2 for 12.3 seconds. How far has the plane traveled in that amount of time
You are 1.9 m tall and stand 3.4 m from a plane mirror that extends vertically upward from the floor. What is the minimum height the mirror must have
A magnetic feild has a magnitude of 1.2x10^-3 T, and an electric feild has a magnitude of a 4.6x10^3 N/C. Both feilds point in the same direction. A positive 1.8μC charge moves at a speed of 3.1 x10^6 m/s in a direction that is perpendicular to bo..
Sound enters the ear, travels through the auditory canal, and reaches the eardrum. What is the fundamental frequency of the canal
John, a 76-year-old grandfather, had been smoking heavily for 26 years and had a persistent cough. A biopsy of his lung tissue revealed considerable amounts of carbon particles. How might this happen considering the natural cleaning mechanism of the ..
A 100 g ball on a 60 cm long string is swung in a vertical circle whose center is 200 cm above the floor. The string suddenly breaks while it is parallel to the ground and the ball is moving upward. The ball reaches a height 600 cm above the floor..
A rectangular antenna has a height of 3m and a width of 6 meters. It operates at a frequency of .5 GHz. What are the two half-power angles
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