A lightrail train from downtown travels at 30 miles per hour. Railcar A has a weight of 17 tons and railcar B has a weight of 21 tons. Find the amount of time required to stop if a force of 6000 lbs applied when breaking. Assume gravity is 32.2 ft/s. It takes seconds to stop the train.

Q: A rightward force of 40.0 N is applied to a 5.0-kg object to accelerate it across a horizontal…

A: The expression for the acceleration from Newton’s second law,

Q: Two cables are pulling on a box, sliding it across the (frictionless) floor.  One cable pulls to the…

A:

Q: A girl with a mass of 52kg rides a skateboard with a mass 1.5kg. She uses her foot to apply a force…

A: Given: The mass of the girl is 52 kg. The mass of the skateboard is 1.5 kg. The acceleration of the…

Q: The net external force on a 24 kg mower is known to be 51 N. a) If the force of friction opposing…

A: Given Net external force on mower = 51 N Mass of mower = 24 kg We have to answer the following…

Q: A lamp hangs vertically from a cord in a descending elevator that decelerates at 1.9 m/s2. (a) If…

A:

Q: 5.6 kg desk is being pushed along a classroom at a constant speed of 0.5 m/s. If a force of 34 N is…

A:

Q: A single-celled animal called a paramecium propels itself quite rapidly through water using its…

A: Newton's second law of motion states that the acceleration of an object is directly proportional to…

Q: A person traveling in a 2,000 kg car at a constant speed of 40.0 m/s applies the brakes, causing a…

A: Given:Mass of the car = 2,000 kgInitial speed of the car = 40 m/sFinal speed of the car = 0Force…

Q: A rope exerts a constant horizontal force of 280 N to pull a 50kg crate across the floor. the…

A:

Q: A 4500 kg jet reaches a takeoff velocity of 70 m/s after accelerating from rest for 700 m down the…

A: The problem is asking us to determine the net force required by the jet's engines in order to…

Q: A child’s model boat, when placed in a creek, accelerates from rest at 1.51 m/s2. If the river is…

A: Initial velocity = 0 msAcceleration (a) = 1.51 ms2Force (F) = 0.79 N

Q: Accident analysis has led experts to believe that Princess Diana experienced a deceleration rate of…

A: At the time of her accident, Diana experienced a deceleration rate of 700 m/s2. This deceleration…

Q: An 85.0 kg subject is strapped into a 1950's rocket sled. Upon firing the rocket sled's acceleration…

A: Given data-  Mass of subject is m=85 kg  Upon firing the rocket sled acceleration is a constant-…

Q: An elevator has a scale that measures the normal force between the contents and the floor. What…

A: Given:Mass,m= 960 kg Accelerating,a=1.5 m/s2Find  force will the scale.Now, Now,The elevator is…

Q: A stubborn, 115 kgkg mule sits down and refuses to move. To drag the mule to the barn, the…

A: Given: The mass of mule is m=115 kg. The maximum force is F=800 N. The static coefficients of…

Q: A single-celled animal called a paramecium propels itself quite rapidly through water using its…

A: Given: Drag coefficient b = 0.330 kg/mSpeed v = 0.000137 m/sNow, the drag force is fd = -bv2As it is…

Q: A 199-Newton horizontal force is exerted upon a 3.2-kg box to move it across a level surface at a…

A: Given data:  Applied force (F) = 199 N, horizontal  Mass (m) = 3.2 kg Constant velocity (v) = 2.5…

Q: A 645 kg car is being pushed along a flat parking lot at a constant speed of 1.78 m/s. The…

A: The mass of the car, m=645 kg The velocity of the car, v=1.78 m/s The coefficient of friction…

Q: A horizontal force of 608 N is needed to overcome the force of static friction between a level floor…

A: Horizontal force applied (F) = 608 N  Mass of crate (M) = 225 kg  Coefficient of kinetic friction =…

Q: Two forces act on an object; a 6 N force in the positive y-direction and an 8 N force in the…

A: The first force acting on an object is, The second force acting on an object is, The net force on…

Q: A 5.0-kg box is being pulled along a horizontal surface by means of a rope that exerts a horizontal…

A: The mass of the box is m=5 kg so the weight of the box can be calculated as, w = mg    = 5 kg9.8…

Q: 2000-kg car initially at rest is held by a friction force that can resist up to 1200 N. If the…

A:

Q: An airplane slows to a stop as it moves along the runway.  Its mass is 3.50 x 105 kg, its speed is…

A:

Q: An impala is an African antelope capable of a remarkable vertical leap. In one recorded leap, a 45…

A:

Q: A soccer player starts from rest and accelerates forward, reaching a velocity of 9.00 m/s in 3.00 s.…

A: The equation of motion is, v = u + at9m/s =0+a3.0sa=3m/s2

Q: You hang a book bag on a spring scale and place the bag on a platform scale so that the platform…

A: Answer:   The magnitude of the force that exerts on the bag is given as:

Q: A 6.0-lb stroller resting on a horizontal floor is pulled by a 85-lb boy with a constant force of…

A: Given mass of stroller ms = 6 lb = 2.72 kg mass of boy mb = 85 lb = 38.56 kg value of Force F = 75…

Q: A stubborn 146 kg mule sits down and refuses to move. To drag the mule to the barn, the exasperated…

A: Given: The mass of the mule is m = 146 kg The farmer pulls the mule with a maximum force is F = 604…

Q: A 950-kg car pulls a boat on a trailer. (a) What force resists the motion of the car, boat, and…

A:

Q: The graph shows the speed of from breaking at 10 s. a 2360.0 kg car as it slows down after the…

A:

Q: A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is…

A: case 1the deceleration is given by

Q: A 1.9 kg otter starts from rest at the top of a muddy incline 84.1 cm long and slides down to the…

A: Given that,The mass of otter : m = 1.9 (kg)The length of muddy inclination : d = 84.1 (cm)The time…

Q: A worker drags a crate across a factory floor by pulling on a rope tied to the crate. The worker…

A: Applied force is Incination angle is The frictional force is Mass of object is Note:Gravitational…

Q: onstant force of friction opposing your push of 75.0 N. As you push the box, it accelerates from…

A: Given: The mass of the object is 50 kg. The friction force is 75 N. The initial velocity of the…

Q: A 1250 kg boat is traveling at 90 km/h when its engine is shut off. The magnitude of the frictional…

A: Using Newton’s second law of motion,

Q: A 1400-kg car is brought from 25 m/s to 10 m/s over a time period of 5.0 seconds. Determine the…

A:

Q: Aircraft carriers use catapults to launch jets from their deck. One such catapult accelerates a…

A:

Q: The maximum force that can be put on an egg without breaking it has been determined to be 15 N.  If…

A: Maximum Force= Fmax=15N acceleration=a= Fmax/m=15N/0.15kg=100m/s2.

Q: A 128 lb person steps into an elevator at the ground floor. The elevator accelerates upward at 5.0…

A:

Q: Superman is applying a 17,000 N horizontal force to try and stop a speeding locomotive. This train…

A:

Q: 2000-kg car traveling at 23 m/s takes 54 m to stop under full braking.  The same car under similar…

A:

Q: A lamp hangs vertically from a cord in a descending elevator that decelerates at 1.7 m/s2. (a) If…

A:

Q: A person catches a ball with a mass of 145 g dropped from a height of 60.0 m above his glove. His…

A: Given:-  The mass of the person is m = 145 g = 0.145 kg  The height of the ball above his glove h =…

Q: A commercial airplane is coming in for a landing. Just before it hits the runway it is moving at 76…

A: a=v2-u22d=0 m/s2-76 m/s221.6km103 m1 km=-1.81 m/s2

Q: A 2140 kg car traveling to the west at 17.1 m/s slows down uniformly. How long would it take the car…

A:

Q: A horizontal force of 734 N is needed to overcome the force of static friction between a level floor…

A:

Q: A warehouse worker applies a force F to accelerate two crates, mд and mp, to the right along a rough…

A: Since the floor is rough, the force on the two crates depends upon the friction of the floor.

Q: A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is…

A: Acceleration is,