Imagine a person riding in an elevator that is just leaving the top floor and picks up speed for 3 seconds until it reaches its maximum cruising speed and holds it for another 4 seconds. While riding this elevator, the person is also standing on a bathroom scale that reads 830 N for the first 3 seconds, and then it reads 930 N for the last 4 seconds. What is the elevator’s velocity at the end of this 7 seconds of motion

Q: A book is pushed downward with a force of 10N. If the mass of the book is 2 kg the 30N 20N 10N ON

A: Given, Downward force=10 N mass of book =2 kg Let normal force is N newton

Q: A person’s weight is 26 newtons when he is on earth but only 30 newtons when he is at the surface of…

A:

Q: Bob pushes on a frictionless cart of mass 6.9 kg and the cart has an acceleration of 7.7 m/s2. If…

A:

Q: 3000 kg roller coaster car is released from rest at the top of a 50m tall hill. What will its…

A:

Q: Hulk starts at 7m, jumps to 16m, and then lands at 8m. What is the total distance covered? What his…

A: Starting point at 7m First jumped to 16m Then lands at 8m

Q: A man with a mass of 100 kg stands on a scale (measuring Newtons) inside a lift that is accalerating…

A: Given data: Mass of man is, m=100 kg. Magnitude of acceleration is, a=4 m/s2.

Q: A person stands on a scale inside an elevator at rest. The scale reads 800 N. The elevator…

A:

Q: Bob pushes on a frictionless cart of mass 22.5 kg and the cart has an acceleration of 1.3 m/s2. If…

A: Solution:-  1) According to the Newton's second laws of motion, the net force acting on an object is…

Q: Sarah stands on a bathroom scale inside an elevator. Sarah's mass is 50 kg. What does the scale read…

A: Given Mass is m=50 kg Acceleration due to gravity is g=9.80 m/s2 Uniform Velocity of elevator is…

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: Zach, whose mass is 80 kg, is in an elevator going up at 6.0 m/s. The elevator takes 2.0 s to stop…

A: Zach is going upward in the elevator, with a constant speed. Eventually the elevator stops at the…

Q: An airplane travels 40 miles in 10 minutes, then travels 20 miles in 80 minutes. Is the pilot…

A: Given data :- distance d1 = 40 miles time t1 = 10 minutes distance d2 = 20 miles time t2 = 80…

Q: A person stands on a scale inside an elevator at rest (Figure 2.54). The scale reads 800 N.(a) What…

A: Person stands on a scale measuring his weight

Q: Bob pushes on a frictionless cart of mass 12.5 kg and the cart has an acceleration of 11.3 m/s². If…

A: According to Newton second law F= MA HERE F is applied force M is mass of object A is acceleration…

Q: Zach, whose mass is 82 kg, is in an elevator descending at 9 m/sm/s. The elevator takes 2.9 s to…

A:

Q: A person’s weight is 26 newtons when he is on earth but only 30 newtons when he is at the surface of…

A:

Q: A person stands on a scale inside an elevator at rest. The scale reads W=666 N. The elevator moves…

A: from the second law of motion F=ma here  F=force acting on the person by the surface of the elevator…

Q: A person stands on a scale inside an elevator at rest. The scale reads 800 N. The elevator…

A:

Q: A person stands on a scale inside an elevator at rest. The scale reads 1800 N. (a) The elevator…

A: Given that a person stands on a scale which is inside the elevator and at rest scale reads…

Q: Starting from rest, Susan pushes a 20 kg box of Christmas decorations with a constant 24 N force…

A: Kinematics.

Q: A 1200 kg car starts from rest at the top of a hill and at the bottom of the hill is moving at 45…

A: Given data:  Mass (m) = 1200 kg Initial velocity (v0) = 0 m/s Velocity at the bottom of the hill (v)…

Q: A jet aircraft with a mass of 4,550 kg has an engine that exerts a force (thrust) equal to 59,200 N.…

A: Given: The mass of a jet aircraft is m = 4550 kg. Force exerted by the engine is F =59200 N.

Q: A car of 1000 kg is travelling at a speed of 36 km/h. The driver suddenly brakes and the car finally…

A: Given data:  Mass (m) = 1000 kg Initial velocity (u) = 36 km/h Final velocity (v) = 0 Distance (d) =…

Q: person’s weight is 26 newtons when he is on earth but only 30 newtons when he is at the surface of…

A: acceleration due to gravity on Earth: ge = 10m/s2 Wt on Earth= 26 N Wt= m×g= 26 m×ge=26  m=2.6 kg

Q: Zach, whose mass is 80 kg, is in an elevator going down at 6.0 m/s. The elevator takes 2.0 s to stop…

A:

Q: A 50 kg astronaut on a space-walk pushes with a force of 50 N against a satellite that has a mass of…

A: Given quantities: Mass of the astronaut (m) = 50 kg Mass of the satellite (M) = 250 kg Applied force…

Q: You throw a ball to the sky to check the dynamics of its speed. When the ball is going up, its speed…

A: When the ball goes upwards, its speed decreases because gravity pulls the ball towards the Earth…

Q: A 5 kg cart is on a track. It is being held at the top of a hill that is 5 m high. If the bottom of…

A:

Q: a 75kg criminal wants to escape from the 5th storey window of the jail,24m above the ground. He has…

A: The objective of the question is to find out the minimum acceleration the criminal can have as he…

Q: You accelerate upward in an elevator which increases its speed from rest to 2.50 m/s in a time of…

A:

Q: Two people play tug of war. The 100-kg person on the left pulls with 1,200 N, and the 70-kg person…

A:

Q: What is the speed at impact of a stone that is dropped from a height of 60 meters? *

A: The third equation of motion is v2 = u2 + 2 g h where, u is the initial velocity, v is the final…

Q: It has been found that a 1500 kg car can stop in 32 m from a speed of 20 m/s. How much force do the…

A: The car's motion is, m=1500 kg The initial speed of the car is, u=20 m/s The distance traveled by…

Q: An airplane reaches a velocity of 80 m/s when it takes off. If the runway is 1 km in length, what…

A: Acceleration can be found by using equation of motion .

Q: speed when the moment it touches the ground

A:

Q: Bob pushes on a frictionless cart of mass 5.4 kg and the cart has an acceleration of 17.4 m/s². If…

A:

Q: vay at a speed braking force needed to bring the car to a halt in 10 s is about * 5 O 1.0 kN 2.0 kN…

A: The mass of the car is 1000 kg is moving with speed 20 m/s. Then the braking force required to stop…

Q: A 50kg woman stands on a scale in an elevator. What will the scale read when the elevator (in units…

A: a. R=mg+aR=50 kg9.8 m/s2+3 m/s2R=640 N b. in this case, the acceleration is zero. thus the scale…

Q: 2.20 lbs package with an acceleration of 0.98 m/s2. If the astronaut was pushed back with a distance…

A: We know that the newton second law of motion is given as  F = ma  where m is the mass. a is the…

Q: A stack of two crates is being accelerated upwards by two cables. The cables are directly attached…

A:

Q: person pushes block A (mass 3 kg) with a constant force of 10 N. Both blocks accelerate together at…

A: Answer the following question is

Q: A ball that has a mass of 10 kg falls from a 100m house. Suppose at t = 0, v = 0. An upward air…

A: We are given mass of ball. We are given resistive force. We first find the resultant force on ball.…

Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.