Physics College

What does it mean when work is positive?
O Velocity is greater than kinetic energy.
O Kinetic energy is greater than velocity.
O The environment did work on an object.
O An object did work on the environment.

Answers

Answer 1

Answer:

O The environment did work on an object

Explanation:

Related Questions

A 2 kg object traveling at 5 m s on a frictionless horizontal surface collides head-on with and sticks to a 3 kg object initially at rest. Which of the following correctly identifies the change in total kinetic energy and the resulting speed of the objects after the collision? Kinetic Energy Speed
(A) Increases 2 m/s 3.2 m/s
(B) Increases Soold 2 m/s
(C) Decreases 3.2 m/s
(D) Decreases

Answers

Answer: (d)

Explanation:

Given

Mass of object [tex]m=2\ kg[/tex]

Speed of object [tex]u=5\ m/s[/tex]

Mass of object at rest [tex]M=3\ kg[/tex]

Suppose after collision, speed is v

conserving momentum

[tex]\Rightarrow mu+0=(m+M)v\\\\\Rightarrow v=\dfrac{2\times 5}{2+3}\\\\\Rightarrow v=2\ m/s[/tex]

Initial kinetic energy

[tex]k_1=\dfrac{1}{2}\times 2\times 5^2\\\\k_1=25\ J[/tex]

Final kinetic energy

[tex]k_2=\dfrac{1}{2}\times (2+3)\times 2^2\\\\k_2=10\ J[/tex]

So, it is clear there is decrease in kinetic energy . Thus, energy decreases and velocity becomes 2 m/s.

A strong trough in a Rossby wave occurs when the jet stream A. bends towards the Equator. B. bends toward the poles. C. does not bend but maintains an east to west flow. D. does not bend but maintains a west to east flow.

Answers

Answer:

A. bends towards the Equator.

Explanation:

Rossby waves are inertial waves that are naturally occurring in a rotating fluids. These waves are also called as the planetary waves.

The Rossby waves are undulated that occur in the polar front jet stream when there is a significant differences in the temperatures between the polar and the tropical air masses.

It occurs when the polar air masses moves towards the equator and when the tropical air masses moves towards the pole.  It is formed when the air bends away from the poles and bends towards the equator.

Hence the correct option is (A).

Other Questions
What is the pH of a solution?O A. A measure of the strength of the acidB. A measure of the buffering ability of the solutionO c. A measure of the hydrogen gas concentrationO D. A measure of the acidity of the solution The diameter of a circle is 6 inches. What is the circle's circumference? Use 3.14 for . Imagine carefully weighing a metal can, leaving it out in the rain for weeks and weeks until it was very rusted, and then carefully weighing it again. Would the can be heavier or lighter after it was rusted? Find the area of the shape below. GUS PLEASE HEL Revenue of a segment includes A. only sales to unaffiliated customers B. Sales to unaffiliated customers and intersegment sales c. Sales to unaffiliated customers and interest revenue d. Sales to unaffiliated customers and other revenue and gains In 2008, the Los Angeles Times asked members of the American public whether free international trade has helped or hurt the economy. Of those surveyed, a.16 percent said free international trade hurt the economy. b.26 percent said free international trade helped the economy. c.57 percent said free international trade helped the economy. d.30 percent said free international trade hurt the economy. A ship is flying away from Earth at 0.9c (where c is the speed of light). A missile is fired that moves toward the Earth at a speed of 0.5c relative to the ship. How fast does the missile move relative to the Earth Find the co-ordinates of the points where the line represented by the linear equationy = 2x -4 intersects x-axis and y-axis. During a storm, heavy rain ___________ a large rock into smaller pieces and then those pieces are __________ downstream from one place to another. *erodes / weatherdeposits / erodedweathered / erodeddischarges / deposits Which of the following is the function f(x) if f^-1(x) = 5x - 19?A. f(x) = x - 19 over 5 B. f(x) = x + 19 over 5 C. f(x) = 5x + 19 D. f(x) = x over 5 + 19 What was the USSR in control of after WW2? Name 3 characteristics of R&B Length of radius r ? The graph represents the piecewise function:f(x)= { __, if -1 x 1; __, if 3 x 5 } Dan, Harry and Regan sell cars.Dan sells x cars.Harry sells 5 more cars than Dan.Regan sells twice as many cars as Dan.Write an expression, in terms of x, for the mean number of cars Dan, Harry and Regan sell. Solve 2x + 6 > 20. OLA X> 18 B. X>7 O c. xsomeone help por favor Can anybody help?? If somebody can answer I'd love it!! Explain what Lester thinks the duty of a witness is What percentage of ozone is contained in the stratosphere? a. 10% b. 50% C. 80% d. 90% Please select the best answer from the choices provided find the height x of the tree