Suppose a vacuum cleaner uses 120 J of electrical energy is 45 J are used to pull air into the vacuum cleaner how efficient is the vacuum cleaner

What causes sedimentary rock to change into metamorphic rock? A) cooling B) melting C) heat and pressure D) weathering and erosion

Explain how you could determine the mass and volume of a gas

Older auto-focus cameras sent out a pulse of sound and measured the time interval required for the pulse to reach an object, reflect off of it, and return to be detected.

A power station burns 75 kilograms of coal per second. Each kg of coal contains 27 million joules of energy. a. What is the total power of this power station in watts? (watts = joules/second) b. The power station's output is 800 million watts.

Assume that you have a battery of emf e m f and three identical lightbulbs, each having constant resistance R. (a) What is the total power from the battery if the bulbs are connected in series? (Use the following as necessary: ℰ for e m f and R.

Doubling the distance between two objects halves the gravitational force between them. true or false

A rocket with a mass of 10,000 kilograms is propelled upward with 8,000,000 joules of kinetic energy. The velocity of the rocket is meters/second. NextReset

Choose the most acidic substance in the group. lemon juice, pH = 2.25 orange juice, pH = 3.75 milk, pH = 6.6 seawater, pH = 8

What is the relative size and composition of the universe, a galaxy, and a solar system? Is the universe endless?

A bumblebee has a mass of 0.22 g. If its speed is 11.50 m/s, calculate its kinetic energy K E.