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Why do you use the minimum time to calculate the maximum value speed?
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- Acceleration a has the dimensions of length per time squared, speed v has the dimensions of length per time, and radius r has the dimension of length. Which of the following expressions may be correct? Explain your answer in each case. a. a = vr b. a = v/r c. a = v2/r d. a = v/r2A men travels with a speed of 20 ms ¹ for 60 minute. How much distance does he travel ?joggers a and b starting from the same point , jogging in opposite direction in a circular track field.their circular path has diameter of 600 meters. if the average speed of jogger A is 3 kph and that of jogger B is to 4 kph.Compute the time they will meet. a. 16.16 b. 21.54 c. 14.54 d. 42.23 what is the correct answer on the choices
- Mario rides his motorcycle in going to school. He drives at an average speed of 30 kilometers per hour. The distance between his house and the school is 15 kilometers. Every time he sees his best friend Jessica walking on the road, he invites her for a ride and lowers his speed. On the other hand, he increases his speed when he wakes up late for school. a) If x represents the time it takes Mario to drive to school with the given distance of 15 kilometers, how will you represent the relationship of his speed (y) versus the time (x)?A stone is dropped from the deck of a bridge. The sound of the splash reached the deck 3 secs later. The speed of sound is 342 m/s in still air. Which of the following gives the time the stone travels from the deck to the water surface before the splash? A 4.181 secs B) 8.281 secs 3.188 secs 1.881 secs E) 2.881 secs F 0.288 secsWhat is the SI unit of instantaneous speed? Select one: O m/s. m's m. O m/s. To measure the instantaneous speed, what should be used? Select one O Two photogates only. O One photogate + glider with double flag O One photogate + glider with single flag O Two photogates + glider with double flag O Two gliders only The average speed becomes a close approximation to the instantaneous speed when Select one O The distance between the two photogates is maximized O The distance between the two photogates is reduced O The air track surface is inclined None of the offered choices fits The triction is reduced
- To burn the fats she accumulated during the lockdown, Katie walks south at a speed of 2.00 m/s for 60.0 minutes. She then turns around and walks north a distance 3000 m in 25.0 minutes. What is her total distance covered?You are observing the poles along the side of the road as described in the opening storyline of the chapter. You have already stopped and measured the distance between adjacent poles as 40.0 m. You are now driving again and have activated your smartphone stopwatch. You start the stopwatch at t 5 0 as you pass pole #1. At pole #2, the stopwatch reads 10.0 s. At pole #3, the stopwatch reads 25.0 s. Your friend tells you that he was pressing the brake and slowing down the car uni- formly during the entire time interval from pole #1 to pole #3. (a) What was the acceleration of the car between poles #1 and #3? (b) What was the velocity of the car at pole #1? (c) If the motion of the car continues as described, what is the number of the last pole passed before the car comes to rest?The velocity-time graph that describes the velocity of an object with time is given as in the figure below. if the values of a= 98.5, b=124.6 and c=57, Find the displacement made by the object in the first hour. v(km/h) b. a t(h) 0.5 1.0 1.5 2.0 Select one: A. 118.1 OB. 175.1 OC 398.4 OD. 139.6 OE 142.7 choice
- A frustrated office worker throws his laptop out of his business's high- rise office building. The height, h, in meters of the laptop above the ground at t seconds can be modelled by h(t) = 125-5t². a. Determine the average rate of change between the third and fourth second of the laptop's flight. b. Estimate the rate at which the laptop hits the ground.A car starts moving at time t=0 and goes faster and faster. Its velocity is shown in the following table. t (seconds) 0 3 6 9 12 Velocity (ft/sec) 0 8 27 43 74 A. Estimate how far the car traveled during the first 12 seconds using the left-hand sums with 4 subdivisions. Answer: B. Now estimate how far the car traveled during the first 12 seconds using the right-hand sums with four subdivisions. Answer:Consider the car shown in (Figure 1). Suppose that y(x) the size of the car in the calculation. Figure Part A V= O μA Value Submit A Request Answer Units = www. 40 Determine the maximum constant speed at which the 2-Mg car can travel over the crest of the hill at A without leaving the surface of the road. Express your answer to three significant figures and include the appropriate units. (1-10000) -y(x) 100 m ? m, where x is in m. Neglect x 1 of 1