Asoccer player kicks a ball at an angle of 35 degrees above horizontal with velocity of 25 m/s. assuming there is no air friction, what is the horizontal component of the ball's velocity 1 s after the ball left her foot? a) 4.5 m/s b) 14.3 m/s c) 15.2 m/s d) 20.5

The ball's horizontal velocity is constant throughout its trajectory, with a magnitude of

If the ball has landed before 1 second has passed, then its velocity will be zero, so we should check if that's the case before we wrap up. The ball's vertical position in the air is given by

where we can assume is the ball's initial position, and is the acceleration due to gravity. Then the time it takes for the ball to reach the ground after being kicked is

So it takes the ball 2.93 seconds to reach the ground, so that after 1 second in particular, the ball's horizontal velocity is still 20.5 m/s.

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.