Why is it impossible to create a perpetual motion machine?

A woman falls to the ground while wearing a parachute. The air resistance of a parachute is 500N. If the woman falls at a constant rate of 5m/s, then the gravitational force on her is

According to Newton's first law of motion, which force is expected to cause a body to accelerate? A. unbalanced force B. balanced force C. weak force D. strong force

Consider an object with weight on the Earth W_earth. The gravity of the Earth is g. If it is moved to another planet with gravity a, how much will be its weight? Note: you don't need to put a number for variables, M, W, a, g

How to detect an acid / base?

Simulation a. does not guarantee optimality. b. is flexible and does not require the assumptions of theoretical models. c. allows testing of the system without affecting the real system. d. All of the alternatives are correct.

Ich of the following is not accurate when describing solids? A. The amount of pressure exerted by a solid is solely dependent on its mass. B. Molecules in solids are closer together than molecules in liquids. C.

Showing how a projectile motion is parabolic

In deep space, there is very little friction. Once they launch a probe into deep space, where there are no external forces acting on it, scientists shut the probe's engines off because the scientists want the probe to

What is the atmosphere and why is it important?

A loud sound is produced in the downtown section of a city. Which of the following is least likely to occur with sound wave.