Calculate potential energy of a 10 kg object sitting on a 20 meter hill

Write the correct abbreviation for each metric unit

Patients with brain tumors may elect to have a procedure known as gamma knife. in a typical gamma knife procedure gamma rays are directed toward a tumor with contact to surrounding tissues. limiting contact between gamma rays and healthy tissue is important because

Answer fast! which lens can produce a virtual image and a real image? concave lens convex lens flat lens