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A: Solution- weight of block W=300 N Force to get the block moving F=120 N…
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A: Given : m1 = 4000 kg m2 = 60 kg Total mass m = 4060 kg u = 40 km/h = 11.11 m/s v = 0 t = 2 s
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A: Mass of body= 2.6 kg F =(3N)i^+(4N)j^ Distance, s= 1m
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- A 75.0-g arrow, fired at a speed of 110 m/s to the left, impacts a tree, which it penetrates to a depth of 12.5 cm before coming to a stop. Assuming the force of friction exerted by the tree is constant, what are the magnitude and direction of the friction force acting on the arrow?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 3.69x103 kg train is moving at a constant speed of 10m/s on a horizontal railroad track that offers an overall frictional force of 500N. Calculate (a) it's acceleration, (b) the engine force, (c) the distance traveled in 20 seconds, (d) its acceleration if it changes its speed to 30 m/s, (e) the engine force in this case?
- A person in a kayak starts paddling, and it accelerates from 0 to 0.8 mile/hour in adistance of 0.8km. If the combined mass of the person and the kayak is 80kg, whatis the magnitude of the net force acting on the kayak?If a 0.50 kg block initially at rest on a frictionless, horizontal surface is acted upon by a force of 4.2 N for a distance of 4.3 m, then what would be the block's velocity (in m/s)?A constant retarding force of 50 N is applied to a body of mass 20 kg moving initially with a speed of 15 ms–1. How long does the body take to stop?
- a 2000-kg car initially at rest is held by a friction force that can resist up to 1200 N. If the person can push with a force of 500 N, how many seconds will it take for the car to reach a speed of 1 m/sec?Typically, a bullet leaves a standard 45-caliber pistol (5.0-in. barrel) at a speed of 262m/s.If it takes 1 ms to traverse the barrel ,determine the average acceleration experienced by the 16.2g bullet within the gun and then compute the average force exerted on it .Following the collision with a tree, the car rapidly decelerates and comes to a full stop in 0.26 seconds. Given that the passenger in the car has a mass of 70.0 kg and experiences a restraining force from the seat belt amounting to 4038 N, what was the car's initial velocity just before the impact with the tree?
- In baseball, a pitcher can accelerate a 0.15-kg ball from rest to 98 mi>h in a distance of 1.7 m. (a) What isthe average force exerted on the ball during the pitch? (b) If themass of the ball is increased, is the force required of the pitcherincreased, decreased, or unchanged? Explain.A baseball pitcher throws a ball straight up into the air at a speed of 21.5 m/s. In the process, he moves his hand through a distance of 2.00 m. If the ball has a mass of 0.250 kg, find the force he exerts on the ball to give it this upward speed. (Report answer to 3SF; unit: N)In an elevator problem, how do we know to use only the 2nd Newton law of motion for scale or elevator at rest?