The graph below shows the position of a race car as it tests out a new engine. a. What is the distance traveled by the car between 5 and 10 seconds? (2 points)

b. What is the average speed of the car between 5 and 10 seconds? (Answer in km/s.) (2 points)

c. Describe how the speed of the car changes throughout its test run. (2 points)

d. If you had a graph of velocity versus time for this test, what would be the total area under the curve? (2 points)

Which statement correctly describes the relationship between frequency and wavelength?

The frequency of vibrations of a vibrating violin string is given by f = 1 2l t ρ where l is the length of the string, t is its tension, and ρ is its linear density.† (a) find the rate of change of the frequency with respect to the following. (i) the length (when t and ρ are constant) (ii) the tension (when l and ρ are constant) (iii) the linear density (when l and t are constant) (b) the pitch of a note (how high or low the note sounds) is determined by the frequency f. (the higher the frequency, the higher the pitch.) use the signs of the derivatives in part (a) to determine what happens to the pitch of a note for the following. (i) when the effective length of a string is decreased by placing a finger on the string so a shorter portion of the string vibrates df dl 0 and l is ⇒ f is ⇒ (ii) when the tension is increased by turning a tuning peg df dt 0 and t is ⇒ f is ⇒ (iii) when the linear density is increased by switching to another string df dρ 0 and ρ is ⇒ f is ⇒

If there's a small amount of friction between two surfaces, the result could be select all that applya. no movement b. heatc. a little bit of movementd. sliding around