I need help with number 1 part a, b and cand number 2 part (i), (ii) and (iii) 1. A dog and a cat ran a race of distance 30 km. In the trail for therace,the doghad an average speed of 2.5 ms and maintained that speed for the race. Thecat takes 10 s to reach a speed of 15 ms and keeps that speed for 20 s, thentakes 10 s to come to a rest. It then rests for 5 s to catch his breath beforerunning again.b. Sketch a velocity-time graph for the cat's 1st periodc. Determine the cat's average speed over the distance, assuming it continuesthe races by running and stoppingd. Determine where the dog would be when the cat wins 2.An engineer at NASA is investigating the impact of meteorites on planets.He performs experiments in a vacuum by dropping metal spheres of differentsizes and different heights above a horizontal bed of sand. In one experiment, ametal sphere of mass 0-1 kg is dropped from a height of 1-2 m. The sphere makes :depression in the sand of 2 cm.gravitational field strength, g = 10 Nkg"'i) Calculate the potential energy of the sphere at a height of 1-2 m.ii) Calculate the velocity of the sphere just before hitting the surface of the sand.iii) Calculate the average retarding force acting on the sphere as it comes to rest inthe sand.

Hello. Since you have posted multiple questions, we will solve the first question for you. If you…

1. A dog and a cat ran a race of distance 30 km. In the trail for the race, the dog had an average speed of 2.5 ms and maintained that speed for the race. The cat takes 10 s to reach a speed of 15 ms and keeps that speed for 20 s, takes 10 s to come to a rest. It then rests for 5 s to catch his breath before then running again. b. Sketch a velocity-time graph for the cat's 1st period c. Determine the cat's average speed over the distance, assuming it continues the races by running and stopping d. Determine where the dog would be when the cat wins

1. A dog and a cat ran a race of distance 30 km. In the trail for the race, the dog had an average speed of 2.5 ms and maintained that speed for the race. The cat takes 10 s to reach a speed of 15 ms and keeps that speed for 20 s, takes 10 s to come to a rest. It then rests for 5 s to catch his breath before then running again. b. Sketch a velocity-time graph for the cat's 1st period c. Determine the cat's average speed over the distance, assuming it continues the races by running and stopping d. Determine where the dog would be when the cat wins

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter2: One Dimensional Motion

Section: Chapter Questions

Problem 52PQ: An object that moves in one dimension has the velocity-versus-time graph shown in Figure P2.52. At...

See similar textbooks

Similar questions

A motorist drives for 35.0 minutes at 85.0 km/h and then stops for 15.0 minutes. He then continues north, traveling 130. Km in 2.00 h. (a) What is his total displacement? (b) What is his average velocity?
A motorist drives for 35.0 minutes at 85.0 km/h and then stops for 15.0 minutes. He then continues north, traveling 130. Km in 2.00 h. (a) What is his total displacement? (b) What is his average velocity?
(a) Calculate the height of a cliff if it takes 2.35 s for a rock to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.00 m/s. (b) How long would it take to reach the ground if it is thrown straight down with the same speed?
An unwary football player collides with a padded goalpost while running at a velocity of 7.50 m/s and comes to a full stop after compressing the padding and his body 0.350 m. (a) What is his deceleration? (b) How long does the collision last?
There is a 250-m-high cliff at Half Dome in Yosemite National Park in California. Suppose a boulder breaks loose from the top of this cliff. (a) How fast will it be going when it strikes the ground? (b) Assuming a reaction time of 0.300 s, how long will a tourist at the bottom have to get out of the way after hearing the sound of the rock breaking loose (neglecting the height of the tourist, which would become negligible anyway if hit)? The speed of sound is 335 m/s on this day.
An object that moves in one dimension has the velocity-versus-time graph shown in Figure P2.52. At time t = 0, the object has position x = 0. a. At time t = 5 s. is the acceleration of the object positive, negative, or zero? Explain. b. At time t = 8 s, is the object speeding up, showing down, or moving with constant speed? Explain. c. Write an expression for the position of the object as a function of time. Explain how you use the graph to obtain your answer. d. Use your expression from part (c) to determine the time (if any) at which the object reaches its maximum position. Check your results by examining the graph. Hint: To get started with finding the maximum of a function, take the derivative and set it equal to zero.
A speedboat travels in a straight line and increases in speed uniformly from i = 20.0 m/s to f = 30.0 m/s in displacement x of 200 m. We wish to find the time interval required for the boat to move through this displacement, (a) Draw a coordinate system for this situation, (b) What analysis model is most appropriate for describing this situation? (c) From the analysis model, what equation is most appropriate for finding the acceleration of the speedboat? (d) Solve the equation selected in part (c) symbolically for the boats acceleration in terms of i, f, and x. (e) Substitute numerical values lo obtain the acceleration numerically. (f) Find the time interval mentioned above.
A student writes, "A bird that is diving for prey has a speed of -10 m / s." What is wrong with the student's statement? What has the student actually described? Explain.
Tectonic plates are large segments of the Earth's crust that move slowly. Suppose that one such plate has an average speed of 4.0 cm/year. (a) What distance does it move in 1 s at this speed? (b) What is its speed in kilometers per million years?
1. Treat the motion of a particle which moves along the s-axis as shown. + 8, ft or m -1 1. 2. 3. The velocity of a particle is given by v where v is in meters per second and t is in seconds. 20r 120t + 25, Plot the velocity versus time graph for the first 10 seconds. Show the zero acceleration. b. Referring to Situation A, what is the velocity of the partidle when the acceleration becomes a. zero. Plot the acceleration versus time graph for the first 10 seconds. d. Describe the slope of the velocity and discuss its relationship to the acceleration of the particle. C.
2. Treat the motion of a particle which moves along the s-axis as shown. ft or m -1 1 2 3 The displacement of a particle is given by s = 4t3 – 20t² + 80t – 30, Where s is in feet and t is in seconds. a. Plot the displacement vs. time graph for the first 15 seconds. Show the zero velocity/velocities. b. Plot the velocity vs. time graph for the first 15 seconds. Show the zero acceleration. Plot the acceleration vs. time graph for the first 15 seconds. d. Using the graphical solution, solve for the maximum positive displacement reached by the particle. e. Using the graphical solution, solve for net displacement reached by the particle. f. Using the graphical solution, solve for the total distance travelled by the particle. с.
1. A vehicle drives at a constant speed of 215km/h for 42.3 seconds, accelerates by 29.4m/s2 for 5.00s. And finally, slows down to the stop. The entire movement takes 88.6 seconds. A. Make a vector-speed diagram or graph as a function of time for the situation. B. Determine the maximum speed. C. Determine the total displacement. 2. Two 9.82km separate trains travel on parallel tracks in opposite directions, one to the other. Train A has a speed of 5.87 km/h at departure and accelerates at a rate of 0.29m/s2. Train B has a speed of 20.3m/s at departure and an acceleration of 0.69m/s2. A. Make a diagram or graph position according to time for the situation. B. Determine when trains meet.