Inside a train traveling at a constant speed of 6 m/s, a ball is thrown vertically up at 12 m/s. What is the velocity of the ball after 1 s as observed by (a) somebody inside the train (b) somebody standing on the ground outside the train
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- You’re speeding at 85 km/h when you notice that you’re only 10 m behind the car in front of you, which is moving at the legal speed limit of 60 km/hr. You slam on your brakes, and your car negatively accelerates at 4.2 m/s2 . Assuming the other car continues at constant speed, will you collide? If so, at what relative speed? If not, what will be the distance between the cars at their closest approach?two friend 50m apart are walking towards each other in a straight road. Man A is walking at a speed of 0.25m/s while the Man B is walking at 0.8m/s. If a pigeon above man A flies towards man B at a constant speed of 5 m/s and flies back again to man A when it is above man B. This goes on until two friends meet. Assuming that there is no speed loss every time the pigeon changes its direction. Determine the total distance that the pigeon flew?Moving sidewalks are installed every other 50 meters along the entire stretch of an airport walkway. These sidewalks move at a constant speed of 1 m/s. A lady passenger takes one of the sidewalks to go from one point to the next. If the passenger decides to go back using the same sidewalk at 1 m/s, how long will it take to reach her point of origin?
- A conductor in a train travelling at 4.0(m)/(s)[N] walks across the train car at 1.2(m)/(s)[E] to validate a ticket. If the car is 4.0m wide, how long does it take the conductor to reach the other side? What is his velocity relative to the ground.Velocity + O 5 3 1 2 Time, s (1) 4 Velocity + Velocity + Time s Time, s (2) Five particles undergo motion as shown in the velocity versus time graphs. In which graph of velocity versus time does a particle end up furthest from the origin (starting point)? 5 Velocity + Velocity + Time, s (5) Time, s (3)from two towns d = 24 km apart. Josh rode at Vj = 25 km/h, and Mike at um = 15 km/h. The moment they start, a fly also starts from Josh towards Mike and after reaching Mike, immediately returns towards Josh. The fly continues back and forth motion between the cyclists till the cyclists meet. Air speed of fly is Uf = 30 km/h and the wind blows always towards Mike with a constant velocity u = 10 km/h. Find the total distance s flown by the fly.
- Christopher watches a stick float downstream in a river and notices that it moves 15 m [El in a time of 2.5 x 10' s. His friend, John, is starting on the south side of the river and is going to swim across. In still water, John knows that he can swim with a speed of 1.2 m/s, relative to the water. a) What is John's velocity relative to the shore? b) If the river is 1.5 km wide, how long will it take John to cross the river? c) How far downstream will be land?Three seconds after automobile B passes through the intersection shown, automobile A passes through the same intersection. Knowing that the speed of each automobile is constant, determine (a) the relative velocity of B with respect to A, (b) the change in position of B with respect to A during a 4-s interval, (c) the distance between the two automobiles 2 s after A has passed through the intersection.A ball is thrown vertically upward with a speed of 12.0 m/s inside a bus moving at 9.0 m/s. What is the velocity of the ball as observed by a man standing on the street?
- A blue car of length 4.52 m is moving north on a roadway (hat intersects another perpendicular roadway (Fig. P2.81, page 58). The width of the intersection from near edge to far edge is 28.0 m. The blue car has a constant acceleration of magnitude 2.10 m/s2 directed south. The time interval required for the nose of the blue car to move from the near (south) edge of the intersection to the north edge of the intersection is 3.10 s. (a) How far is the nose of the blue car from the south edge of the intersection when it stops? (b) For what time interval is any part of the blue car within the boundaries of the intersection? (c) A red car is at rest on the perpendicular intersecting roadway. As the nose of the blue car enters the intersection, the red car starts from rest and accelerates east at 5.60 m/s2. What is the minimum distance from the near (west) edge of the intersection at which the nose of the red car can begin its motion if it is to enter the intersection alter the blue car has entirely left the intersection? (d) II the red car begins its motion at the position given by the answer to pan (c), with what speed does it enter the intersection?While riding on an elevator descending with a constant speed of 2.6 m/s, you accidentally drop a book from under your arm.A)How long does it take for the book to reach the elevator floor, 1.1 m below your arm? (Already answered it's 0.47s)B)What is the book's speed relative to you when it hits the elevator floor?Two students are on a balcony 18.6 m above the street. One student throws a ball (ball 1) vertically downward at 15.1 m/s; at the same instant, the other student throws a ball (ball 2) vertically upward at the same speed. The second ball just misses the balcony on the way down. (a) What is the difference in the two ball's time in the air? (s)(b) What is the velocity of each ball as it strikes the ground? ball 1 magnitude (m/s) direction ---Select--- upward downward ball 2 magnitude (m/s) direction ---Select--- upward downward (c) How far apart are the balls 0.900 s after they are thrown? (m)
