# Physics,Question ,Solved but about Units?

posted by .

These are “plug-in-the-number” tasks to familiarize you with the
main formulas that link the physics concepts of this chapter. They
are one-step substitutions, much less challenging than the Think
and Solve problems that follow.
Average speed !
total distance covered
travel time
34. Show that the average speed of a rabbit that runs a distance
of 30 m in a time of 2 s is 15 m/s.

35. Calculate your average walking speed when you step
1.0 m in 0.5 s.
Acceleration !
change of velocity
time interval
!
"v
"t
Here is the example practice question but Im not sure how to work it out,perhaps this is more specific?
Physics - Steve, Wednesday, October 10, 2012 at 2:25pm
keep in mind that if there is very little data provided, the formulas involved will be relatively simple.

Always keep track of the units. That way you will know whether you are manipulating the various quantities correctly.

#34.
speed is distance/time. so, since you are given a distance and a time,

speed = 30m/2s = 30/2 m/s = 15m/s

#35.
1.0m/0.5s = 1/.5 m/s = 2m/s

as for acceleration, just as speed is change in distance over elapsed time, acceleration is change in speed over elapsed time.

So, if a runner increases his speed from 10m/s to 20m/s in 2 seconds, the acceleration a is

a = (20-10)m/s / 2s = 10/2 m/s^2 = 5m/s^2
How do I keep track of the Units?

## Similar Questions

1. ### Rate determining step

I don't understand how to get a rate determining step. I have an energy diagram for a two-step conversion where the first step Ea is about 18 units. The energy then goes down about 4 units and rises again about 10 units to the peak …
2. ### AP Physics

Using what's only in chapter one The Nature of Science Models, Theories, and Laws Measurement and Uncertainty; Significant Figuers Units, Standards, and SI System Converting Units Order of Magnitude: Rapid Estimating Dimensions and …
3. ### AP Physics

hi I need help on this proof ok I'm tyring to prove that v^2 = v^20 + 2a(x -x0) where the zeros are subscripts ok the first step my book says is start out with x = x0 + average velocity (t) then plug in average velocity x = x0 + (2^-1(v …
4. ### Algebra

Randy, Sam, Tim and Will counted the number of puzzles they had solved in two months. Sam has solved twelve more than Tim. Randy had solved seventeen less than Sam.Will had solved twice as many as Randy. They have solved a total of …
5. ### Algebra 1

Randy, Sam, Tim and Will counted the number of puzzles they had solved in two months. Sam has solved twelve more than Tim. Randy had solved seventeen less than Sam.Will had solved twice as many as Randy. They have solved a total of …
6. ### Static Electricity. 11th Grade Pre-AP Physics

Hi everyone! I need some help studying for a test on Static Electricity. I have a few review questions that I don't know how to do. Below they are numbered and in parenthesis I answered what I think you might have to do to get the …
7. ### Physics

These are “plug-in-the-number” tasks to familiarize you with the main formulas that link the physics concepts of this chapter. They are one-step substitutions, much less challenging than the Think and Solve problems that follow. …
8. ### Math

Hi everyone, my name is Emerson. I was wondering if anybody could help me on a test. I'm stuck on some, but I think I know some others. Thank you! 1. Translate the phrase "nine more than two times a number" in to an algebraic expression. …
9. ### PHYSICS 1

The vector signs are above each letter (I just don't know how to show it that way) A= 145 units @ 190 deg. B= 75 units @ 288 deg. C= 210 units @ 85 deg. D= 105 units @ 355 deg. How do I use the component Method with these given magnitude …
10. ### Physics 11

In the absence of air resistance, a ball of mass m is tossed upward to reach a height of 20m. Given that Fg=mg, what is the net force on the ball at the 10m position (half way up)?

More Similar Questions