Pt 1.

A toy car with a mass of 2.35 kg is pushed with a force of 21.6 N. What is the acceleration of the car?

A) given the information: write the given information in the problem. If any Units need to be converted, make that conversion as a part of your given answer.

B) Equation: write the general equation you will need to solve this problem, then use algebra steps to isolate the variable you are solving if necessary.

C) substitute and calculate: substitute the given values into your equation and solve.

D) final give your final answer with correct units rounded to the correct number of significant figures.

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pt 2.
1. A car is traveling down the interstate at 37.1 m/s. The driver sees a cop and quickly slows down. If the driver slows to 29.8 m/s in 3 seconds. What is the acceleration of the car?

2. While cleaning you lift an 87.3 N box up to a shelf that is 2.04 m above the ground. How much work was done on the box?

3. A child runs up the stairs and does 1250 j of work. If the child is generates 267 W of power, how long did it take for the child to run up the stairs?

4. A 8.642 kg rabbit is running across your back yard. If that rabbit has 125.6 j of Kinetic Energy, how fast is it running?

5. When using a simple machine you do 120 j of work on the machine. You notice that the machine gives you an output of 93 j. What is the efficiency of this machine?

6. A 212 kg bumper car is traveling 8.00 m/s when it rear ends a second 196 kg bumper car traveling 6.75 m/s. If the cars get stuck together, how fast are they traveling after the collision.

7. A wave is traveling through a string. If the wave has a wavelength of .23 m and a frequency of 12 hz, what is the speed of the wave?

8. Find the wavelength of blue light if it’s frequency is Hz. (Hint: remember the speed of light).

9. The speed of sound in air is about 343 m/s. If you scream and a friend hears you 0.287 s later, how far away is your friend?