Amtrak's 20th-Century Limited is en route from Chicago to New York at 120 km/h when the engineer spots a cow on the track. The train brakes to a halt in 1.5 min , stopping just in front of the cow. What is the magnitude of the train's acceleration?

Two soccer players start from rest, 39 m apart. They run directly toward each other, both players accelerating. The first player's acceleration has a magnitude of 0.48 m/s². The second player's acceleration has a magnitude of 0.49 m/s². (a) How much time passes before the players collide? (b) At the instant they collide, how far has the first player run? (a) Number M. (b) Number i Units Units ✪

Any assistance with this physics problem would be great!

Review. You are sitting in your car at rest at a traffic light with a bicyclist at rest next to you in the adjoining bicycle lane. As soon as the traffic light turns green, your car speeds up from rest to 49.0 mi/h with constant acceleration 8.00 mi/h/s and thereafter moves with a constant speed of 49.0 mi/h. At the same time, the cyclist speeds up from rest to 23.0 mi/h with constant acceleration 14.00 mi/h/s and thereafter moves with a constant speed of 23.0 mi/h. (a) For what time interval (in s) after the light turned green is the bicycle ahead of your car? S (b) What is the maximum distance (in ft) by which the bicycle leads your car during this time interval? ft

A space vehicle is coasting at a constant velocity of 20.5 m/s in the +y direction relative to a space station. The pilot of the vehicle fires a RCS (reaction control system) thruster, which causes it to accelerate at 0.351 m/s2 in the +x direction. After 33.2 s, the pilot shuts off the RCS thruster. After the RCS thruster is turned off, find (a) the magnitude and (b) the direction of the vehicle's velocity relative to the space station. Express the direction as an angle (in degrees) measured from the +y direction.

Vladimir is traveling South at a steady 70.0 mi/hr (31.3 m/s) on a straight portion of Route 3. The car directly ahead of him is also traveling at 70 mi/hr. Vladimir is keeping what he feels is a safe distance from the car directly ahead of him, 35.0 m (roughly 7 car lengths). Suddenly at t = 0, having noticed a posted speed limit of 40.0 mi/hr (due to road construction), the driver of the car ahead slams on his brakes and begins to slow down at a steady rate of 10.0 "m/2 . Once he has slowed down to 40.0 mi/hr (17.9 m/s), he plans to maintain this constant speed. Suppose that it takes Vladimir 1.00 second to notice that the car ahead has slowed down, and another 2.00 seconds to effectively apply his brakes. Also suppose that, once he has applied his brakes, Vladimir's car slows down at a steady rate of 10.0 X=0 X=35.0 m 16. Assume, for the sake of argument, that no collision occurs. What distance will Vladimir's car travel while he is in the process of slowing down to 40.0 mi/hr? A.…

The Starship Enterprise returns from warp drive to ordinary space with a forward speed of 57 km/s. lo the crow's great surprisc, a Klingon ship is 150 km directly ahead, traveling in the same direction at a mere 21 km/s. Without evasive action, the Enterprise will overtake and collide with the Klingons in just about 4 5s The Enterprise's computers react instantly to brake the ship. What magnitude acceleration does the Enterprise need to just barely avoid a collision with the Klingon ship? Assume the acceleration is constant Hint: Draw a position versus time graph showing the motions of both the Enterprise and the Klingon ship. Let æn - 0km be the location of the Interprise as it returns from warp drive I low do you show graphically the situation in which the collision is "barely avoided"? Once you decide what it looks like graphically, express that situation mathematically. Express your answer to two significant figures and include the appropriate units. a = μA Value m s² Review |…

A Lockheed Martin F-35 Lightning II jet takes off from an aircraft carrier with a runway length of 107 m and a takeoff speed 77 m/s at the end of the runway. Jets are catapulted into airspace from the deck of an aircraft carrier with two sources of propulsion: the jet propulsion and the catapult. At the point of leaving the deck of the aircraft carrier, the F-35's acceleration decreases to a constant acceleration of 4.8 m/s2 at 23° with respect to the horizontal. (Assume that the F-35's initial direction along the deck of the aircraft carrier is the +x-direction and that the +y-direction is up.)   What is its velocity and speed at this time? (Enter your answers in m/s.) v(5.4 s)= (?î +?ĵ)   v(5.4 s)=   ? m/s How far (in m) has it traveled horizontally?

A spacecraft is traveling with a velocity of v0x = 6710 m/s along the +x direction. Two engines are turned on for a time of 796 s. One engine gives the spacecraft an acceleration in the +x direction of ax = 2.31 m/s2, while the other gives it an acceleration in the +ydirection of ay = 8.98 m/s2. At the end of the firing, what is a) vx and b) vy?

Please answer all question parts: A Lockheed Martin F-35 Lightning II jet takes off from an aircraft carrier with a runway length of 97 m and a takeoff speed 72 m/s at the end of the runway. Jets are catapulted into airspace from the deck of an aircraft carrier with two sources of propulsion: the jet propulsion and the catapult. At the point of leaving the deck of the aircraft carrier, the F-35's acceleration decreases to a constant acceleration of 4.3 m/s2 at 33° with respect to the horizontal. (Assume that the F-35's initial direction along the deck of the aircraft carrier is the +x-direction and that the +y-direction is up.) (a) What is the initial acceleration (in m/s2) of the F-35 on the deck of the aircraft carrier to make it airborne? (Enter the magnitude.) (b) Write the position (in m) and velocity (in m/s) of the F-35 in unit vector notation from the point it leaves the deck of the aircraft carrier. (Use the following as necessary: t.) (c) At what altitude (in m) is…