Most important in an investigation of an airplane crash by the U.S. National Transportation Safety Board is the data stored on the airplane’s flight-data recorder, commonly called the “black box” in spite of its orange coloring and reflective tape.The recorder is engineered to withstand a crash with an average deceleration of magnitude 3400g during a time interval of 6.50 ms. In such a crash, if the recorder and airplane have zero speed at the end of that time interval, what is their speed at the beginning of the interval?

Q: External stimuli are communicated to the brain by means of electrical signals propagating along…

A: speed of electrical signals along nerve cells (v) = 34 m/s distance travelled by signal resulting…

Q: Assume there is a completely straight highway from City A to City B, which is 200km long. You drive…

A: Average speed=Total distancetime                     = 200+2004                    = 100 km/h

Q: A baseball is pitched, reaching the batter with a speed of 37 m/s, and is hit such that it returns…

A: Given Data:- Initial speed of the baseball is vi=37 m/s Final speed of the baseball is vf=48 m/s…

Q: In the Daytona 500 auto race, a Ford Thunderbird and a Mercedes Benz are moving side by side down a…

A: Let AB is first interval and after the pit BC is second interval.

Q: A glider on an air track carries a flag of length l through a stationary photogate, which measures…

A:

Q: A skier left a mountain 40 m long in 10 s, after which he rode along a horizontal platform to a stop…

A: The acceleration of skier is 0.8 m when it just left the mountain. The velocity when skier reach at…

Q: A bus stopped at a traffic light. Its position is given by x(t)=38.0m + (22.4 m/s)t -…

A:

Q: As a science project, you drop a watermelon off the top of the Empire State Building, 320 m above…

A:

Q: Suppose a car is traveling at +21.4 m/s, and the driver sees a traffic light turn red. After 0.511 s…

A: Initial velocity (u) = +21.4 m/sReaction time (t) = 0.511 sDeceleration (a) = -5.00 m/s2 Final…

Q: The science lecture theatre of a college is 10m wide and has a door at a corner. A science teacher…

A:

Q: Dr. John Paul Stapp was a U.S. Air Force officer who studied the effects of extreme acceleration on…

A: Given data: Initial speed is, u1=0 m/s                  (As sled starts from rest) Final speed is,…

Q: Suppose a car is traveling at +24.7 m/s, and the driver sees a traffic light turn red. After 0.262 s…

A: Given Data: Initial velocity of the car (vi) = 24.7 m/s.Reaction time (t) = 0.262 s.Acceleration (a)…

Q: A car is moving towards the left, which is the negative X direction. It travels 49.2 m during a…

A: The objective of the question is to find the X component of the car’s average velocity during the…

Q: A ranger in a national park is driving at 22.0 mi/h when a deer jumps into the road 180 ft ahead of…

A: The initial velocity of a ranger is, u=22 mi/hr=9.835 m/s The final velocity of a ranger is, v=0 m/s…

Q: An ambulance driver is rushing a patient to the hospital. While traveling at 72 km/h, she notices…

A: Initial speed, u = 72 km/h = (72×5)/18 m/s = 20 m/sDistance, s = 52 mTime, t = 2.17 sAcceleration, a…

Q: The driver of a car is initially moving at a constant speed of 70.4 km/h when a traffic light turns…

A: Initial speed of the car is V = 70.4 km/h  Reaction time is t = 0.520 s

Q: To qualify for the finals in a racing event, a race car must achieve an average speed of 160 mi/hr…

A:

Q: A particle moves along the +ve direction of x-axis. Its position x depends on time t as…

A: Given:Position of particle (x)=at3+bt2+c+d

Q: The contraction of the left ventricle of the heart lasts for 250 ms and the blood speed after…

A: Given - The contraction time of the left ventricle of the heart ( ∆T )=250 ms=250×10-3 s The rate…

Q: de effects of gravity. After 5 seconds have passed, fuel will run out and no longer provide upward…

A: Solution:The maximum height reached in 5 seconds can be obtained by the given relation and using…

Q: An iceboat sails across the surface of a frozen lake with constant acceleration produced by the…

A: Given:  final velocity, v = 0  initial velocity, time, t  = 3 s

Q: The bacterium Escherichia coli (or E. coli) is a single-celled organism that lives in the gut of…

A: Given,             Zig-Zag constant speed, v = 20 μm/s             Other data in the graph

Q: A particle travels with velocity v = (8 m/s?) t - 7m/s. (a) Find the average acceleration for two…

A:

Q: stopping

A: Given: The initial speed of the airplane = 201 Km/hr= 55.83 m/s Time taken to stop the airplane =…

Q: In the Daytona 500 auto race, a Ford Thunderbird and a Mercedes Benz are moving side by side down a…

A:

Q: A single-engine air plain starts its engine at one end of the runway. It accelerates at a constant…

A: Given, velocity v=38 m/s time t=20 s

Q: The infamous chicken is dashing toward home plate with a speed of 5.7 m/s when he decides to hit the…

A: (a) The magnitude of acceleration is given by,

Q: Amtrak's 20th-Century Limited is en route from Chicago to New York at 120 km/h when the engineer…

A:

Q: In the Daytona 500 auto race, a Ford Thunderbird and a Mercedes Benz are moving side by side down a…

A: Given data The speed of the thunderbird is St = 66 m/s The speed of the Mercedes Benz is Sm = 66 m/s…

Q: A Boeing 747 "Jumbo Jet" has a length of 64.5 m. The runway on which the plane lands intersects…

A:

Q: A car, moving to the left in a straight line in the negative x-direction, travels a distance d=17 m…

A: YES   The distance travelled by the car in the negative x direction is d =17 m in time interval of t…

Q: Suppose a car is traveling at +24.3 m/s, and the driver sees a traffic light turn red. After 0.219 s…

A: Given: Speed of the car (v) = 24.3 m/s. reaction time (tr) = 0.219 s. Deceleration (a) = 4.0 m/s2.

Q: car was traveling at 33.0 m/s on a poorly lit country road.  The driver started to brake 0.35…

A: The distance travelled by the car is, d=vt=33 m/s0.35 s=11.55 m The distance between the bridge and…

Q: In a test run, a certain car accelerates uniformly from zero to 21.6 m/s in 2.15 s. (a) What is the…

A: Given Data: Initial velocity of car (u) = 0 m/s Final velocity of car (v) = 21.6 m/s time (t) = 2.15…

Q: An object accelerating at constant acceleration (a) has an initial velocity v0 (at t=0), a velocity…

A: Given data: The initial velocity is v0. The velocity at time t is v. The distance traveled is d.

Q: At 5:11 p.m. in the highway and at the height of a town, a police patrol was traveling at a speed of…

A: (a)   Consider the time taken by police petrol to reach the citizen after the reaction time be t.…

Q: At t = 0, one toy car is set rolling on a straight track with initial position 15.0 cm, initial…

A: Let us consider two toy cars, Toy car A and Toy car B For Toy car A initial position, x=15.0 cm…

Q: The patient attends physiotherapy procedures at the clinic every day. Every morning he leaves the…

A: Let total distance from house to clinic is d km  Now, time taken to reach clinic  t = d/v = (d/25) h…

Q: A Lockheed Martin F-35 Lightning II jet takes off from an aircraft carrier with a runway length of…

A: Given:- The length of the runway = 107 m takeoff speed = 77 m/s  Acceleration is 4.8 m/s2  at θ=23o…

Q: In 1948 United States Air Force pilot Gail halvorsen became known as the Berlin Candy Bomber when he…

A:

Q: On a one lane road, a person driving a car at v1 = 58 mi/h suddenly notices a truck 1.1 mi in front…

A:

Relative Velocity

It is a measurement of an object with regards to the other object which is moving or stable or stationary. For example, if we are traveling in a bus and the bus is moving at speed of 50km/hr, then our speed is according to the nearby passenger on the bus is zero. According to them, we are not moving. But if one person standing on the ground or road observes us from outside of the bus, according to him we are moving at a speed of 50km/hr and the bus is also moving at a speed of 50km/hr. Now, the motion is recognized by the observer, it depends on a frame of reference or observer. This is motion called relative motion.