The typical American man has a leg length of 0.85 m and walks at a speed of 1.4 m/s. A giraffe’s legs are 1.8 m long. At what speed do you expect a giraffe to walk?

Q: A rock, released at rest from the top of a tower, hits the ground after 1.5 s. What is the speed of…

A: When the rock is released from the top of the tower, its potential energy  is converted to kinetic…

Q: A bowling ball is attached to a 4.05-meter long cable and hung from the ceiling. The cable is kept…

A: Given data: The length of cable is l=4.05 m. The initial height is h=1.61 m. The final height is…

Q: Tectonic plates are large segments of the Earth's crust that move slowly. Suppose that one such…

A:

Q: Two friends watch a jogger complete a 400 m lap around the track in 100 s. One of the friends…

A: distance, d = 400 m time, t = 100 s

Q: A roller coaster glides from rest from the top of an 80.0-meter hill. What is the speed of the…

A:

Q: The ceiling of an arena is 77 m above the floor. What is the minimum speed that a thrown ball would…

A: initial velocity = u Height os ceiling of arena above the floor (h) = 77 m

Q: Amy, who has a mass of 60 kg, is riding her bicycle in the country. She is traveling at 13 m/s when…

A: Scenario - Amy descends from a hill of certain height with a velocity and climbs up another hill.…

Q: On a distant planet (NOT EARTH!!!) an object is allowed to slide 30.0 m down a frictionless ramp,…

A:

Q: Julie, who has a mass of 65 kg, is enjoying a day at the local water park with some friends. She…

A: Calculate the vertical height of the bottom from the top of the water slide. h = (12 m) - (1 m)   =…

Q: Three people are walking. The first person walks at a slow pace, the next walks at a medium pace,…

A:

Q: Problem 8. A baseball has a mass of 0.149 kg. to. If it is thrown with a speed of 55 m/s and after…

A:

Q: A man pushes an object to the right and exerts a force which has a horizontal compotent of F = 33 N.…

A: External force on the body F = 33 NFrictional force fs = 15 NMass of the object m = 31 kg.Given time…

Q: A kid in a wagon rolls from rest down a hill and reaches the bottom at 12 m/s. On the next run she…

A: From kinematics equation, the formula for the velocity is: Since the wagon roll is not experiencing…

Q: A 115 gram apple falls from a branch that is 3.5 meters above the ground. (a) How much time elapses…

A: Givenm=115 gh=3.5 m(a)h=ut+12gt2 =0+12gt2         ( as u=0 , apple just falls , no initial…

Q: gh the road is lev

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Q: A car is going 16 m/s for 12 s. Draw an accurate graph showing the distance versus time for the car.…

A: A car is going 16 m/s for the 12 s

Q: An astronaut is exploring a planet which has a gravitational acceleration of only 5.59 m/s2. If the…

A: Given data The initial velocity is given as u = 13.7 m/s. The acceleration applied on the ball is…

Q: A youth of mass m = 36 kg is swinging on a swig. Length from upper bar of swing set to the set is L…

A: Mass is Radius of circle is Note:Find:The minimum speed at the top of circle in order to make a full…

Q: A ball is thrown downward from the top of a 40.0 m tower with an initial speed of 12.0 m/s. Assuming…

A: Height of building= 40 m Initial speed= 12 m/s Ball is thrown downward.

Q: A car is initially at rest on a straight road. The graph shows the speed of the car as a function of…

A:

Q: A tired cyclist on a bicycle (102.0 kg combined) starts with an initial velocity of 15.0 m/s at the…

A:

Q: A roller coaster is at the top a vertical height of 6.0 m. If it starts its descent with an initial…

A:

Q: A physics book slides off a horizontal tabletop with a speedof 1.10 m/s. It strikes the floor in…

A: Given data: The horizontal speed of the book is ux=1.10 m/s. The time in which it strikes the floor…

Q: A bridge that was 11.2 m long has been washed out by the rain several days ago. How fast must a car…

A: The given data are: l=11.2 md=3.3 m Here, l is the length of the bridge and d is the distance.

Q: A rock is thrown (at an unknown angle) with a speed of 15.5 m/s from the top of a 32.9 m high cliff.…

A:

Q: A 72 fireman slide down a 3.2 m pole by applying a frictional force of 377 N against the pole with…

A: Given , mass of fireman , m = 72 kg Height of pole , h = 3.2m Frictional force , f = 377 N…

Q: A fast train bump into a slow train going the same direction, and they get coupled together.  The…

A: First let's assume that the masses of both the trains to be the same. As the fast train is coupled…

Q: A tourist at a rim of a canyon yells "hello!" toward the opposite side. She hears the echo "hello"…

A: Data  we have Speed of sound,v=340m/s time required for echo to travel,t=4s To find d=?

Q: At t=0, a particle starts with an initial velocity of 10 i m/s and accelerates uniformly at (-2.0 i…

A: Given initial speed (u)=10 m/s Acceleration (a)=(-2.0 i +4.0 j) m/s2 Required speed at t=5 s

Q: A boy tosses a coin straight up to 2.2 m. Suppose the height when the coin leaves his hand is 1.3 m.…

A: Initial height of the coin in boy's hand = 1.3 m The height of the coin when it tosses = 2.2 m The…

Q: A roller coaster has speed of v0=6.2 m/s as it hits the peak of a h=31.5m dip. What is the car's…

A: According to the conservation of total mechanical energy, the total mechanical energy of a system…

Q: An object is thrown upward at a speed of 71 feet per second by a machine from a height of 8 feet off…

A: Height is given as  h=-16t2+71t+8…

Q: A roller-coaster goes over a 12 m tall hill then approaches a 30 m hill. What is the minimum…

A:

Q: While standing at the edge of the roof of a building, a man throws a stone upward with an initial…

A: To solve the given question, we will use the conservation of energy.

Q: A 150kg fish swimming at 8.0m/s swallows a 15kg fish swimming towards it at 4.0m/s.  What is the…

A:

Q: Julie drives 91 mi to Grandmother's house. On the way to Grandmother's house, Julie drives half the…

A: Average speed is, vavg=total distancetotal time Total distance traveled by Julie on the way to…

Q: An explosion causes debris from the ground to rise vertically with an initial velocity of 160 feet…

A: Given data: Initial velocity (v0) = 160 ft/s Height (h) = 300 ft Required: The speed at height 300…

Q: You shoot a ball straight up with an initial speed of 8490 m/s. When it reaches a height of 4.0 x 10…

A: Given, v0=8490 m/sh=4.0×106 m

Q: A child throws a stone downward from the top of a cliff with a speed of 4m/s. You notice that it…

A: It is given that,

Q: A car is traveling horizontally at 28.7 m/s at the moment it drives off the top of a cliff. The car…

A: Write the equation of motion,

Q: A child riding a bicycle has a total mass of 30.6 kg. The child approaches the top of a hill that is…

A:

Q: A cat chases a mouse across a 1.7 m high table. The mouse steps out of the way, and the cat slides…

A: Given data The height is h=1.7 m  The distance is d= 1.5 m The acceleration of gravity is g=9.81…

Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.