A Concave makeup mirror is designed so that a person 25.0
rem in front of it sees an upright image at a distance of 50.0 cm
behind the mirror.
What is the radius ok curvature of the mirror? What is the
magnification of the image? is the image real or virtual?

Determine the maximum r-value of the polar equation r =3+3 cos 0

Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?