The three point charges +4.0 μc, -5.0 μc, and -9.0 μc are placed on the x-axis at the points x = 0 cm, x = 40 cm, and x = 120 cm, respectively. what is the x component of the electrostatic force on the -9.0 μc charge due to the other two charges? (k = 1/4πε0 = 9.0 × 109 n ∙ m2/c2)

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.

Which of the the following are examples of projectile motion of both projectile motion and two dimensional motion

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?