Your friend says that one way to improve air quality in a city is to have traffic lights synchronized so that motorists can travel long distances at constant speed. What physics principle supports this claim?

Q: constant

A: The solution can be given as follows, m is the mass hung on spring g is the acceleration due to…

Q: *System starts from rest* Determine the Velocity of "A" after B has fallen down 0.5m. (Spring…

A: In the given question, Spring constant (k) = 200N/m Mass of A = ma = 10kg Mass of B = mb = 60kg…

Q: A ball of mase m = 1kg is performing circular motion around a cone. Speed of ball is 3 m/s and…

A: The distance of the ball hanging on the string is, r=lsinθ=5 msin37°=3.01 m

Q: During a water balloon fight at a college dormitory, a student drops a 0.80-kg water balloon from a…

A: Given data: m=0.8 kgv=14 m/s Need to determine the height of the window.

Q: a boat whose top speed is still water is 12 knots points north and steams at full power. if there is…

A: Given: The velocity of the boat in the still water is 12 knots in the north direction. The velocity…

Q: If it were not for air resistance, why would it be dangerous to go outdoors on rainy days?

A: Air resistance causes the speed of the body to slow down.

Q: A hollow steel ball weighing 4 pounds is suspended from a spring. This stretches the spring feet.…

A:

Q: How much force does a 15-kg leg exert during running if the person has a 2-m stride and runs at a…

A: Mass of the leg (m) = 15 kg Speed (v) = 8 m/s Energy = 1/2 m v2  .       E = (1/2 )× 15 × (8)2…

Q: A rock is thrown upward at 40 degrees with respect to the horizontal. Ignoring air resistance, the…

A: angle of projection = 40 degreelet the initial speed = v maximum height = v2sin2(40)/2g range =…

Q: In an ore-mixing operation, a bucket full of ore is suspended from a traveling crane which moves…

A:

Q: is 9.8 m

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Q: 38. A l-kilogram bird stands on a limb. The force that the limb exerts on the bird is (1) 1 N (2) 2…

A: As per our guidelines, we are supposed to answer only first one question in case of multiple…

Q: Based on the Aristotelian conception of motion, why do clouds form in the atmosphere and rain falls…

A: Aristotle divided motion in two categories : 1. Natural or vertical motion : The motion that any…

Q: s. The elevator takes š e first floor.

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Q: A plane traveled 900 miles to Athens and back.The trip there was with the wind. It took 9 hours.The…

A: When the plane travels in the direction of wind then the net speed gets added up and when it flows…

Q: When a feather and a coin are dropped from the same height at the same time in vacuum Select one: a.…

A: Air Resistance: Air resistance can be defined as the opposing or frictional force, which tends to…

Q: the string is attached at its top is a peg, distance 3 L bêlow the string touches the peg and the…

A: The tension in the string at the horizontal position relative to the peg (let say position 2)…

Q: stone is dripped fr

A: Stone has an initial velocity zero. The acceleration due to gravity g is known. Let us consider it…

Q: Which will cause more damage, a truck weighing 700 kg travelling at a speed of 60 km/h or a truck…

A:

Q: A load of 54 N attached to a spring hanging vertically stretches the spring 7.5 cm. The spring is…

A: Given data: Force, F = 54N   m =7.5cm=0.075m   Amplitude, x = 10cm =0.1m

Q: Why did you need to climb the stairs with a constant speed ?

A: Step1 - Understanding some basic concepts of physics that will be useful in this problem.…

Q: An airplane takes 5 hours to travel a distance of 4800 miles with the wind. The return trip takes…

A: Write the expression of speeds when airplane travels with the wind. vp+va=48005vp+va=960 miles/h…

Q: When a feather and a coin are dropped from the same height at the same time in vacuum Select one: a.…

A: When a feather and a coin are dropped from the same height at the same time in vacuum, both…

Q: Is the average swimmer taller than the average volleyball player?

A: Average tallest players are basketball players and then comes volleyball players .

Q: The elevators in the Landmark Tower in Yokohama, Japan are among the fastest in the world. They…

A: Given:  u=0m/s , initial speed v = Final speed to be calculated. a= 3.125m/s2 , acceleration t = 4…

Q: Janine is thinking about jumping off a cliff into a lake. The cliff is 20 m high and she is curious…

A: Given : Initial position of rock (yo) = Height of cliff  Therefore , yo = 20 m Initial speed (vo) =…

Q: Large birds like pheasants often walk short distances. Small birds like chickadees never walk. They…

A: The maximum walking speed is limited by the size of the legs of the animals. the maximum walking…

Q: A load of 50N stretches a vertical spring by 0.15 m. What is the spring constant

A:

Q: Before String Is Cut String Compressed spring After String Is Cut 3 m/s 6 mys Describe the…

A: The quantities which will remains the same after the string is cut are 1. Mass or weight of both the…

Q: 2. A0.2 kg point object is attached to 0.6 long string. The other end of the string attached to a…

A: Tension in the strong will be due to 2 forces, weight of the object and the centrifugal force acting…

Q: How much does a 0.25kg apple have with an acceleration of 9.8m/s

A: Given data:  Mass (m) = 0.25 kg Acceleration (a) = 9.8 m/s2 Required: Force (F)

Q: An astronaut wearing a space suit floats in the middle of a room with no air and is 20.0m from any…

A: In the Newton's third law, when two objects interact, they apply forces to each other of equal…

Q: A block of ice moves along a very wide frictionless ice sheet at a constant speed of 3 meters per…

A: Given  Speed of ice block (v)  = 3m/s     Surfaces are frictionless Speed is constant with time . It…

Q: 2.0 m 10m 4.0 kg 1.0 kg

A:

Q: Why sand is thrown on the tracks covered with snow?

A: If the tracks are covered with snow then there is a substantial reduction in frictional force…

Q: Someone standing at the edge of a cliff throws one ball straight up and another ball straight down…

A: To determine the final speed of both balls. We need to choose the correct option.

Q: gravity alone in vacuum. Which of the followin The acceleration of the object remains constant O a.…

A: The gravity of the earth attracts every object towards its center. When an object is dropped from a…

Q: A weight on the end of a spring bobs up and down one complete cycle every 5 seconds. It's time…

A: The weight attached to the end of the spring, the motion of the system is known as the simple…

Q: Superhighway in Canada have speed limits of 100 km/h. How does this compare with the 65 min/h speed…

A:

Q: A box of mass 2.0 kg is at rest on a horizontal frictionless table. A force of 20 N acts on the box…

A:

Q: A person is sitting in a moving train and is facing the engine. He tosses up a coin and the cion…

A: Form the frame of reference of the train, a pseudo force has to be acting on the coin in the…

Q: Four arrows, all with the same shape and size, are shot directly upward. Ignore the effect of air…

A:

Q: 10 N force made the spring stretched 5 cm longer than its original length, suspend a 2kg mass will…

A: Scenario - Spring stretches a certain length when a mass is suspended from it. Given : Initial force…

Q: A stone dropped into a well takes 1.5 seconds to reach the water. Ignoring the effects of air…

A: Given, a stone is dropped into well from a height.time taken by the stone to reach the surface of…

Q: A stone is dropped from the edge of a cliff and hits the ground below in 3 s. The hight of the cliff…

A: Given data:  Initial velocity (V0) = 0 m/s Time (t) = 3 s Required: Height of the cliff

Q: A person pushes a 0.20 kg lunch tray across a table, and it slows down as it slides because of…

A: Recall Fk=μkN