An electron initially has a speed 16 km/s along the x-direction and enters an electric field of strength 27 mv/m that points in the y-direction and has a width of 22.5 cm. (a) how long does it take the electron to pass through the field? μs (b) how far is the deflection?

Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.

Could someone . i have tried to solve myself but my calculation is off

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply