Tina and her puppy are tugging on a rope each pulling on opposite ends when is tina doing work? When is Tina doing work?

Suppose an object has 40 N of tension force pulling it upward and 60 N of gravitational force pulling it downward. There are no forces acting on the object. The object then has a net upward force of 20 N. True or False

What is resistivity

When air transfers energy to a cooler object what happens to the air temperature?

Which of the following contributes to the phases of the Moon as seen from Earth? The Moon orbiting the Earth. The Sun lighting different parts of the Moon at different times. Varying amounts of the Moon's lit surface being visible from Earth.

Underground water is being pumped into a pool whose cross section is 3 m x 4 m while water is discharged through a 0.076m-diameter orifice at a constant average velocity of 6.3 m/s. if the water level in the pool rises at a rate of 1.

The driver of a car traveling at 32 m/s applies the brakes and undergoes a constant deceleration of 2.25 m/s^2.

You are going to develop some photographic film that involves a chemical reaction between the developer, which you will mix yourself, and a chemical on the surface of the film.

Would time travel mean that parallel universes would be created off our linear time sequence to ensure the universe doesn't collapse itself because of significant events being drastically changed in the way it shapes the universe?

What is the central core of hair

A star with the same mass of the sun has a newly discovered planet whose semi-major axis of 2.48 au and an eccentricity of 0.08. what is the aphelion distance of the new planet