Acell phone is placed 25 cm in front of a diverging lens with focal length of magnitude 20 cm. how far is the image of this phone from the lens? a) 9 cm b) 20 cm c) 11 cm d) 100cm

What is the coefficient of kinetic friction μk between the block and the tabletop?

You hang a book bag on a spring scale and place the bag on a platform scale so that the platform scale reads 23.7n and the spring scale reads 13.8n. what is the magnitude of the force that earth exerts on the bag?

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)