An alpha particle is a nucleus of helium. it has twice the charge and four times the mass of the proton. when they were very far away from each other, but headed toward directly each other, a proton and an alpha particle each had an initial speed of 3.1×10−3 c, where c is the speed of light. what is their distance of closest approach? there are two conserved quantities. make use of both of them. (c = 3.00 × 108 m/s, k = 1/4πε 0 = 8.99 × 109 n · m2/c2, e = 1.60 × 10-19 c, m proton = 1.67 x 10-27 kg)

What term do psychologists use to designate our personal awareness of feelings, sensations, and thoughts?

•• al and bert are jogging side-by-side on a trail in the woods at a speed of 0.75 m/s. suddenly al sees the end of the trail 35 m ahead and decides to speed up to reach it. he accelerates at a constant rate of 0.50 m/s2, while bert continues on at a constant speed. (a) how long does it take al to reach the end of the trail? (b) once he reaches the end of the trail, he immediately turns around and heads back along the trail with a constant speed of 0.85 m/s. how long does it take him to meet up with bert? (c) how far are they from the end of the trail when they meet?

What is the weight of a 8-kg substance in n, kn, kg·m/s2, kgf, lbm·ft/s2, and lbf?