7) A particle moving in a straight line slows down at a constant rate from 50 m/s to 25 m/s in 2 seconds. What is the acceleration of the particle? O -12.5m/s^2 O -20.8m/s^2 O 10m/s^2 O 100m/s^2 8) Consider a loop with 50 square turns that is 12 cm on a side and is in a uniform 0.6 T magnetic

7) A particle moving in a straight line slows down at a constant rate from 50 m/s to 25 m/s in 2 seconds. What is the acceleration of the particle? O -12.5m/s^2 O -20.8m/s^2 O 10m/s^2 O 100m/s^2 8) Consider a loop with 50 square turns that is 12 cm on a side and is in a uniform 0.6 T magnetic

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter3: Two-dimensional Kinematics

Section: Chapter Questions

Problem 53PE: A seagull flies at a velocity of 9.00 m/s straight into the wind. (a) If it takes the bird 20.0 min...

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A seagull flies at a velocity of 9.00 m/s straight into the wind. (a) If it takes the bird 20.0 min to travel 6.00 km relative to the Earth, what is the velocity of the wind? (b) If the bird turns around and flies with the wind, how long will he take to return 6.00 km? (c) Discuss how the wind affects the total round-trip time compared to what it would be with no wind.
An airplane maintains a speed of 630 km/h relative to the air it is flying through, as it makes a trip to a city 750 km away to the north, (a) What time interval is required for the trip if the plane flies through a headwind blowing at 35.0 km/h toward the south? (b) What time interval is required if there is a tailwind with the same speed? (c) What time interval is required if there is a crosswind blowing at 35.0 km/h to the east relative to the ground?
A bolt drops from the ceiling of a moving train car that is accelerating northward at a rate of 2.50 m/s2, (a) What is the acceleration of the bolt relative to the train car? (b) What is the acceleration of the bolt relative to the Earth? (c) Describe the trajectory of the bolt as seen by an observer fixed on the Earth.
An athlete crosses a 25-m-wide river by swimming perpendicular to the water current at a speed of 0.5 m/s relative to the water. He reaches the opposite side at a distance 40 m downstream from his starting point. How fast is the water in the river flowing with respect to the ground? What is the speed of the swimmer with respect to a friend at rest on the ground?
14. A particle starts to move at O and travels in a straight line with velocity v cms-1, where v=4t4+t3+5t2+t+7 and t is the time in seconds after leaving O. The particle comes to rest at A. Calculate the total distance covered from t = 0 t = 4
A particle moves in a circular path of radius r with speed v. It then increases its speed to 2v while traveling along the same circular path. (i) The centripetal acceleration of the particle has changed by what factor? Choose one: (a) 0.25 (b) 0.5 (c) 2 (d) 4 (e) impossible to determine (ii) From the same choices, by what factor has the period of the particle changed?
1. The population P of elephants in a wild animal preserve changes with time (in years) according to the equation dP - 0.0005P(190 - P)dt = 0. If there are 46 elephants initially, in how many years will the population reach 90? 2. For earth, let g and R be the acceleration due to gravity and the radius, respectively. If another Planet B has one-half the acceleration due to gravity of the earth but four times its radius, then the velocity of escape of that same object placed on Planet B is twice that on earth. (True or False)
two car with a distance of 100m between them are moving in the same direction with the same speed. At t=0 s , the cars start to apply constant acceleration with the same magnitude but in opposite directions, simultaneously. at the 5th second, the cars are the same position, and one of the cars is stopping. calculate the velocity of the moving car at the 5th second. (ıf you use g ; take g = 10m/s2)
8) A seagull flies at a velocity of 11.00 m/s straight into the wind. (a) If it takes the bird 21.0 min to travel 6.00 km relative to the earth, what is the velocity (in m/s) of the wind? _____m/s (b) If the bird turns around and flies with the wind, how long (in s) will he take to return 6.00 km? _____ s (c)Discuss how the wind affects the total round-trip time compared to what it would be with no wind.
A ball is thrown up verically from your hand. If the ball returns to your hand in 3.84 s , at what speed in m/s i sthe ball initially thrown form your hand> use g=9.81 ms^2 as the magnitude of the accelaeration due to gravity and ignore air resistance.
An iceboat sails across the surface of a frozen lake with constant acceleration produced by the wind. At a certain instant the boat's velocity is (2.69î-2.98ĵ)m/s. Three seconds later, because of a wind shift, the boat is instantaneously at rest. What is the average acceleration for this 3.00 s interval?
(II) Two planes approach each other head-on. Each has a speed of 780km/h and they spot each other when they are initially 10.0 km apart. How much time do the pilots have to take evasive action?