Aquarterback throws a football with an initial velocity v at an angle θ above horizontal. assume the ball leaves the quarterback’s hand at ground level and moves without air resistance. all portions of this problem will produce algebraic expressions in terms of v, θ, and g. let the origin of the cartesian coordinate system be the ballʼs initial position.
(a): write an expression for the magnitude of the football’s initial vertical velocity v0y.
(b): find an expression for the magnitude of the football’s initial horizontal velocity v0x.

What are similarities and differences between refraction, reflection, diffraction and absorption?

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.

How does a circuit breaker protect a refrigerator? a. when the current is too high, a metal strip in the fuse melts and opens the circuit. b. when the resistance is too high , a re-settable which opens a circuit c. when the current is too high , a re-settable switch opens the circuit d. when the resistance is too high a metal strip in the fuse melts and opens the circuit