A neutron star is the remaining core of giant stellar explosion, called a supernova. As a result of its formation, all the electrons and protons in a neutron star have been combined into neutrons. A neutron star is, effectively, a gigantic atomic nucleus consisting only of neutrons. Consider a neutron star with a mass that is 2.65 times the mass of the Sun (mSun = 1.99 ✕ 1030 kg). What is its radius (in km)? (Assume we can model it as a nucleus with a radiusr = r0A1/3.)km

One hazard of space travel is debris left by previous missions. there are several thousand masses large enough to detect by radar orbiting the earth, but there are far greater numbers of very small masses such as flakes of paint. calculate the force exerted by a 0.110 mg chip of paint that strikes a space shuttle window at a relative speed of 5.00 ✕ 103 m/s and sticks, given the collision lasts 6.00 ✕ 10-8 s. such a collision chipped the window of the ill-fated challenger in june 1983, causing $50,000 of damage.