Which item is an example of a lever?

1. scissors

2. a screw hammered in the wall

3. a flagpole

4. the slope of a hill

5. a knife

What acceleration is produced when a 12-N force is exerted on a 3-kg object?

Which of the following is the reason a lever is used in a shovel? A. a lever is used to decrease effort force B. a lever is used to decrease resistance force C. a lever is used to increase resistance force D.

Maria takes a boat upstream for 9 hours. Her return trip downstream only took 6 hours. If the river she is on has a current of 1 mile per hour, how fast does her boat move in still water?

Explain why pulling is easier than pushing?

The Moon orbits Earth and not the Sun because the Sun doesn't exert a gravitational force on the Moon. A. True B. False

The kinetic energy of a moving object is equal to the work required to bring it to its speed from rest, or the work the object can do while being brought to rest.

Imagine standing on a bathroom scale and reading your weight. now lift one foot and read your weight again. does the scale read more, less or the same weight when you are standing on one foot?

The period T of a simple pendulum depends on the length L of the pendulum and the acceleration of gravity g (dimensions L/T^2). (a) Find a simple combination of L and g that has the dimensions of time.

What is an example of the theory that the best adapted organisms for an environment are the ones most likely to survive

What does not affect the apparent brightness of a star?