The development of cars has pros and cons. the car has allowed for better transportation, but it is also responsible for a great deal of pollution. which activity can reduce pollution through the use of new technology? a. building cars that run on nonpolluting fuels b. encouraging people to ride the bus c. building fewer cars d. encouraging people to walk more

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .