Sunday
April 26, 2015

Homework Help: Physics

Posted by y912f on Thursday, February 5, 2009 at 11:18am.

please check:
1. A piece of chalk is dropped by a teacher walking at a speed of 1.5 m/s. From the teacher's perspective, the chalk appears to fall.

STRAIGHT DOWN

2. Which is the force of an acceleration?

FORCE

3. A free-body diagram of a ball falling in the presence of air resistance would show

A DOWNWARDS ARROW TO REPRESENT THE FORCE DUE TO GRAVITY AND AN UPWARD ARROW TO REPRESENT THE FORCE OF AIR RESISTANCE

4. As an object falls toward Earth

THE OBJECT EXERTS A DOWNWARD FORCE ON EARTH

5. A net force of 6.8 N accelerates a 31 kg scooter across a level parking lot. What is the magnitude of the scooter's acceleration?

0.22 M/S^2

6. A hocky stick hits a puck on the ice. Identify an action-reaction pair in this situation

THE STICK EXERTS A FORCE ON THE PUCK; THE PUCK EXERTS A FORCE ON THE STICK

7. Calculate the following, expressing the answer in scientific notation with the correct number of signifant figures: (8.86 + 1.0 * 10^-3) / 3.610 * 10^-3

i dont really get this one

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