A body of mass 1 kg is moving along a straight line with a velocity of 1 ms'. The external force acting on the body is (a) 1N (c) 10 N (b) 1 dyne (d) zero dv=c %3D
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- A 0.340 kg particle moves in an xy-plane according to x(t) = -15 + 2t – 4t^3and y(t) = 25 + 7t –9t^2, with x and y in meters and t in seconds. At t = 0.700 s, what are (a) the magnitude and (b) the angle (relative to the positive direction of the x-axis) of the net force on the particle, and (c) what is the angle of the particle's direction of travel?A freight train consists of two 8.00×104-kg enginesand 45 cars with average masses of 5.50×104kg . (a) What force must each engine exert backward on the track toaccelerate the train at a rate of 5.00×10–2 m/s2if the force of friction is 7.50×105 N , assuming the engines exertidentical forces? This is not a large frictional force for such amassive system. Rolling friction for trains is small, andconsequently trains are very energy-efficient transportationsystems. (b) What is the force in the coupling between the37th and 38th cars (this is the force each exerts on the other),assuming all cars have the same mass and that friction isevenly distributed among all of the cars and engines?Three forces, F1=2Ni+3Nj, F2=-10Nj and F3=3Ni+1Nj-5Nk, act on a particle. Find the net force on the particle.
- Paleontologists estimate that if a Tyrannosaurus rex had tripped and fallen, the ground would have exerted anormal force of approximately 260,000 N on its torso as it landed.Assuming the torso has a mass of 3800 kg, (a) find the magnitudeof the torso’s upward acceleration as it comes to rest. (For comparison, humans lose consciousness with an acceleration of about 7g.)(b) Assuming the torso of a T. rex is in free fall for a distance of 1.46m as it falls to the ground, how much time is required for the torsoto come to rest once it contacts the ground?A 747 jetliner lands and begins to slow to a stop asit moves along the runway. If its mass is 3.50 * 105 kg, its speed is75.0 m>s, and the net braking force is 7.25 * 105N, (a) what is itsspeed 10.0 s later? (b) How far has it traveled in this time?A net force of 1.0 N acts on a 2.0 kg object, initially at rest, for 2.0 sec. Find the distance it moves during that time.
- A 20 kg body is initially moving at 30 m/s to the right along a frictionless horizontal surface when a force F = 80 N is applied to it for 10 s. Determine its final velocity if a) F is directed to the right, b) F is directed to the left, and c) F is applied at an angle of 60o N of W.b) A wagon carrying a child, with a combined mass of 52 kg, was pulled by an adult with a force of 138N [forward] on a bumpy road with a friction force of 26N. QA4.3kg bowling ball was rolled out onto the smooth frictionless lane with an applied force of 17N [forward]. ) Draw FBD here: ) Draw FBD here: Determine the net force (with direction) acting on the underlined object: 0Determine the net force (with direction) acting on the underlined object ) Determine the acceleration of the underlined object: ) Determine the acceteration of the underlined object:As a fish jumps vertically out of the water, assume thatonly two significant forces act on it: an upward force F exertedby the tail fin and the downward force due to gravity. A recordChinook salmon has a length of 1.50 m and a mass of 61.0 kg.If this fish is moving upward at 3.00 m/s as its head first breaksthe surface and has an upward speed of 6.00 m/s after twothirdsof its length has left the surface, assume constant accelerationand determine (a) the salmon’s acceleration and (b)the magnitude of the force F during this interval.
- 1D Constant Force. A vehicle weighing 2.00 × 10³ kg is being driven at a constant velocity through a blizzard with 10.0 m visibility. When the driver slams on the brakes, the stopping force exerted on the vehicle is 4.00 KN. (a) If the driver has an instant reaction (and is able to apply the brakes immediately when a stationary obstacle is exactly 10.0 m ahead), what is the maximum speed (in km/hr) they can safely drive? (b) If the driver's reaction is instead delayed by 0.500 s, what is the maximum speed (in km/hr) they can safely drive?If a 1.6 kg object is initially at rest on a frictionless, horizontal surface and subjected to a 12.2 N force in the positive x-direction over a distance of 3.99 meters, what will the object’s final speed be? Assume the answer in in m/s.The velocity of an object of mass m= 5.00 kg is giving by v(t) = (3.0m/s)t+ (2.00 m/s-)t. The velocity of the object at t = 0 s is equal to v = 0 m/s. Find the force as a function of time that causes the object to move.