Concept explainers
ǁ Electric drag racer. An electric drag racer is much like its piston engine counterpart, but instead it is powered by an electric motor running off of onboard batteries. These vehicles are capable of covering a
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- My question isn't how to solve the problem exactly. In fact, it's already been solved on this website. My question is about the acceleration. When I solve this problem myself, first I calculate the velocity by dividing 100m by 53s. I get 1.89m/s. Then I use that to find the acceleration using the equation vf = vi + at. That's 1.89/53 = 0.036m/s^2. That's not correct. The correct way to find the acceleration is to us the equation d = 1/2 at^2 and solve that way without taking the intermediate step of finding the velocity. Doing it that way, the acceleration is 0.0712m/s^2. My question is why you get a different result doing it the first way than you get doing it the second way.arrow_forwardACTIVITY #2 3. An antelope moving with constant acceleration covers the distance between 2 points 70 meters apart in 7 seconds. Its speed as it passes the 2nd point is 15 m/s. a. What is its speed at the first point? b. What is its acceleration? 4. A bird is flying due east. Its distance from a tall building is given by x(t) = 28 m + (12.4) t- (0.045) 3 (12.4- a. What is the velocity of the bird when t = 8 seconds? b. What is the acceleration of the bird when t = 8 seconds?arrow_forwardAll I need is the letter of correct answer. An airplane must have a velocity of 50 m/s in order to take off. What must the acceleration of the airplane be if it is to take off from a runway 500 m long? A) 2.5 m/s˄2 B) 3.2 m/s˄2 C) 5.0 m/s˄2 D) 10 m/s˄2 15A car with its brakes applied has an acceleration of -1.2 m/s˄2. If its initial velocity is 10 m/s, the distance the car covers in the first 5 second after the acceleration begins is A) 15 m; B) 32 m; C) 35 m; D)47 m.arrow_forward
- I need (a) and (c) answer for this question.Thank you.arrow_forwardA polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, and then returns to its starting point. This trip takes 0.75 hr. a) What was the bear's average speed? b) What was the bear's average velocity?arrow_forwardA model rocket accelerates upward from the ground with a constant acceleration, reaching a height of 1000 m in 10 s. a) What is the speed (in m/s) at a height of 1000 m? b) What is the acceleration (in m/s 2)?arrow_forward
- You are driving along Lawrence Ave. at 60 km/h. You see the traffic light ahead is still green and decide to speed up to try to make it through the intersection before it turns red (poor decision!). Your car accelerates at 1.3 m/s. You reach the light after accelerating for 4.3 seconds. What is your speed at the light in m/s? V =v, +aAt A: Pictorial Representation Sketch showing events, describe events, coordinate system, label givens & unknowns with symbols, conversions B: Physics Representation Motion diagram, motion graphs, velocity vectors, events a C: Word Representation Describe motion (no numbers),-assumptions, estimated result (no calculation) D: Mathematical Representation Describe physics of steps, complete equations, algebraically isolate, substitutions with units, final statement of prediction E: Evaluation Answer has reasonable size, direction and units? Why?arrow_forward1. A train moves on a straight track of length d= 4.82 km connecting two stations. While speeding up, the engine can deliver an acceleration of al = 0.854 m/s?. When breaking, the brakes can deliver an acceleration of magnitude a2 = 0.484 m/s?. a) The train leaves the first station from rest and the engine constantly accelerates, what is the velocity with which the train reaches the second station? b) What is the total time it takes for the train to start at the first station, accelerate for some time, then immediately break for some time and come to a stop at the second station?arrow_forward"A jet plane is cruising at 320 m/sm/s when suddenly the pilot turns the engines up to full throttle. After traveling 4.8 km , the jet is moving with a speed of 400 m/sm/s. What is the jet's acceleration, assuming it to be a constant acceleration? Express your answer to two significant figures and include the appropriate units." I am having issues setting up word problems to begin solving. Need an easier method or technique to help deciper these.arrow_forward
- A car is traveling at an initial speed of 20 m/s and slows to rest with an acceleration of -5.0 m/s?. What is the stopping distance, in meters? Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.arrow_forwardAt time t = 0, a particle has a velocity of m v = 4.00. The following graph shows the particles a(t) S acceleration vs. time. a. What was the particle's velocity at t = 3.00s ? 2 4 t b. What was the particle's instantaneous acceleration time(s) at t = 3.00s ? С. What was the average acceleration between t = 1.00s and t = 3.00s ? 4- 2. acceleration(m/s)arrow_forwardin his novel From the Earth to the Moon (1866), Jules Verne describes a spaceship that is blasted out of a cannon, called the Columbiad, with a speed of 12,000 yards/s. The Columbiad is 900 ft long, but part of it is packed with powder, so the spaceship accelerates over a distance of only 700 ft. Estimate the acceleration experienced by the occupants of the spaceship during launch. Give your answer in m/s2 (Verne realized that the "travelers would . . . encounter a violent recoil," but he probably didn't know that people generally lose consciousness if they experience accelerations greater than about 7g∼70m/s2.arrow_forward
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