( A star to whoever answers the questions right) Number the following objects in order from least to greatest momentum (1 = least and 5 = greatest)

1. Jogging man (1,2,3,4)
2. Fast train (1,2,3,4)
3. Rolling Marble (1,2,3,4)
4. Standing Hippopotamus (1,2,3,4)

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

How do we measure or think of speed in the united states?

Aresistor with an unknown resistance is connected in parallel to a 9 ω resistor. when both resistors are connected in parallel to an emf source of 21 v, the current through the unknown resistor is measured with an ammeter to be 4 a. what is the resistance of the unknown resistor? answer in units of ω.