Homework Answers
Given, The mass of a rock = 9 kg
We know,
Work done = Force * displacement
The work done is a vector product of force and displacement.
As the displacement from New York to Boston is in x -direction and the gravitational force in y-direction.
So, the work done is zero.
But it also depends on the difference in the level each city according to the sea level. If there is some difference in the sea level of departing point and landing point then, the work done will be the product of gravitational force and the difference.
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1 point) A rock with a mass of 9 kilograms is put aboard an airplane in...
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(8c8p4) In the figure, a frictionless roller coaster of mass 1000 kg tops the first hill at height, h = 28 m with speed 8.55 m/s. How much work does its weight do on it from that point to point A? How much work does its weight do on it from that point to point B? How much work does its weight do on it from that point to point C? If the gravitational potential energy of the coaster-Earth system...
Question 7 1 pts A rock is sliding down a hill. Assume that the hill is...
Question 7 1 pts A rock is sliding down a hill. Assume that the hill is 20 meters high and the rock has a mass of 1,000 kilograms. If the rock started at the top of the hill with no initial speed, how much is its kinetic energy when it reaches the bottom of the hill? Use g=10 m/s2. Give the answer in kilojoules.
Question 9 (1 point) An airplane, with the mass of 5,713 kg, is about to take...
Question 9 (1 point) An airplane, with the mass of 5,713 kg, is about to take off. It taxis 2.28 km [E], then 1.52 km [N], then 4.14 km [W] on the runway before it takes off. From the beginning of taxiing it takes 42.5 min until the airplane takes off. What is the average speed of the airplane in km/h? Enter your answer up to 5 decimal places.
In the figure, a frictionless roller coaster car of mass m = 637 kg tops the...
In the
figure, a frictionless roller coaster car of mass m = 637 kg tops the first
hill with speed v0 = 19.3 m/s at
height h = 37.2 m. How much work
does the gravitational force do on the car from that point
to (a) point A, (b) point B, and (c) point C? If the gravitational
potential energy of the car-Earth system is taken to be zero
at C, what is its value when
the car is at...
Imagine two billiard balls on a pool table. Ball A has a mass of 2 kilograms...
Imagine two billiard balls on a pool table. Ball A has a mass of 2 kilograms and ball B has a mass of 3 kilograms. The initial velocity of ball A is 9 meters per second to the right and the initial velocity of the ball B is 6 meters per second to the left. The final velocity of ball A is 9 meters per second to the left, while the final velocity of ball B is 6 meters to...
please help! (1 point) How much work is required to lift a 1500-kg satellite to an...
please help!
(1 point) How much work is required to lift a 1500-kg satellite to an altitude of 1.100 m above the surface of the Earth? The gravitational force is F=GMm/r2, where M is the mass of the Earth, m is the mass of the satellite, and is the distance between the satellite and the Earth's center. The radius of the Earth is 6.4. 100 m, its mass is 6 . 1024 kg, and in these units the gravitational constant,...
Question 51 point) An airplane, with the mass of 6,641 kg, is about to take off....
Question 51 point) An airplane, with the mass of 6,641 kg, is about to take off. It taxis 2.18 km [E], then 1.83 km , then 4.88 km [W] on the runway before it takes off. From the beginning of taxiing it takes 45.7 min until the airplane takes off. What is the average speed of the airplane in km/h? Enter your answer up to 5 decimal places. Do not enter units. Your Answer: Answer Question 6 (1 point) The...
Problem 2: (1 point) Suppose that to send an Internet packet from the east coast of...
Problem 2: (1 point) Suppose that to send an Internet packet from the east coast of the Uniterd States to the west coast, a packet must go through a major east-coast city (Boston, New York Washington D.C., or Atlanta), a major mid-west city (Chicago, St. Louis, or New Orleans), and a major west-coast city (San Francisco or Los Angeles). How many possible routes are there?
The figure shows a thin rod, of length L = 2.10 m and negligible mass, that...
The figure shows a thin rod, of length L = 2.10 m and negligible mass, that can pivot about one end to rotate in a vertical circle. A heavy ball of mass m = 9.20 kg is attached to the other end. The rod is pulled aside to angle θ0 = 22.0° and released with initial velocity = 0. As the ball descends to its lowest point, (a) how much work does the gravitational force do on it and (b)...
The figure shows a thin rod, of length L = 1.6 m and negligible mass, that...
The figure shows a thin rod, of length L = 1.6 m and negligible mass, that can pivot about one end to rotate in a vertical circle. A heavy ball of mass m = 9.1 kg is attached to the other end. The rod is pulled aside to angle θ0 = 6.4° and released with initial velocity v Overscript right-arrow EndScripts Subscript 0 = 0. As the ball descends to its lowest point, (a) how much work does the gravitational...
Question 7 1 pts A rock is sliding down a hill. Assume that the hill is 20 meters high and the rock has a mass of 1,000 kilograms. If the rock started at the top of the hill with no initial speed, how much is its kinetic energy when it reaches the bottom of the hill? Use g=10 m/s2. Give the answer in kilojoules.
Question 9 (1 point) An airplane, with the mass of 5,713 kg, is about to take off. It taxis 2.28 km [E], then 1.52 km [N], then 4.14 km [W] on the runway before it takes off. From the beginning of taxiing it takes 42.5 min until the airplane takes off. What is the average speed of the airplane in km/h? Enter your answer up to 5 decimal places.
In the
figure, a frictionless roller coaster car of mass m = 637 kg tops the first
hill with speed v0 = 19.3 m/s at
height h = 37.2 m. How much work
does the gravitational force do on the car from that point
to (a) point A, (b) point B, and (c) point C? If the gravitational
potential energy of the car-Earth system is taken to be zero
at C, what is its value when
the car is at...
please help!
(1 point) How much work is required to lift a 1500-kg satellite to an altitude of 1.100 m above the surface of the Earth? The gravitational force is F=GMm/r2, where M is the mass of the Earth, m is the mass of the satellite, and is the distance between the satellite and the Earth's center. The radius of the Earth is 6.4. 100 m, its mass is 6 . 1024 kg, and in these units the gravitational constant,...
Question 51 point) An airplane, with the mass of 6,641 kg, is about to take off. It taxis 2.18 km [E], then 1.83 km , then 4.88 km [W] on the runway before it takes off. From the beginning of taxiing it takes 45.7 min until the airplane takes off. What is the average speed of the airplane in km/h? Enter your answer up to 5 decimal places. Do not enter units. Your Answer: Answer Question 6 (1 point) The...
Problem 2: (1 point) Suppose that to send an Internet packet from the east coast of the Uniterd States to the west coast, a packet must go through a major east-coast city (Boston, New York Washington D.C., or Atlanta), a major mid-west city (Chicago, St. Louis, or New Orleans), and a major west-coast city (San Francisco or Los Angeles). How many possible routes are there?
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