Abird has a forward force due to its wings of 3 n. the drag force of the air is 2 n backwards and its lift force and the force of gravity are 2 n upwards and downwards, respectively. what is the net force on the bird? a. 9 n b. 1 n forwards c. 7 n forwards d. 1 n backwards

Ahollow metal sphere has 6 cm and 11 cm inner and outer radii, respectively. the surface charge density on the inside surface is −100nc/m2. the surface charge density on the exterior surface is:

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

Could someone me find the answer to this problem.