The above free body diagram represents the motion of a toy car across a floor from left to right. the weight of the .5 kg car is about 5 n and it is being pushed with 20 n of pressure. if there is 10 n of friction across the floor, what is the net force acting on the car?

a

since the car is moving to the right, the normal force is balancing the weight and the net force is 10 n, right.

b

friction and the normal force are acting opposite the applied force, so the net force is 5 n, right.

c

the net force is 35 n, the addition of each of the forces acting on the car and causing it to accelerate.

d

net force is equal to mass times acceleration so the net force is .5 kg times 9.8 m/s^2 or roughly 5 n.

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

Acar moves at 12m/s and coasts up a hill with a uniform acceleration of -1.6m/s2. how far has it traveled after 6.0s?