If oxygen and steel wool are combined is it a physical change or chemical change?

A box is being pushes across a room with a force of 150 N. if the box was moved 5 m, how much work was done

A capacitor c is connected in series with a resistor r across a battery and an open switch. if a second capacitor of capacitance 2c is connected in parallel with the first one, the time constant of the new rc circuit will be

A negative charged particle of known magnitude qis placed in a uniform electric field of known strength E. What additional information is needed to determine the magnitude of the force on the particle?

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The range of the tides is affected by the relative positions of the sun and the moon. During the new moon and full moon, the highest high tides and the lowest low tides occur.

You slide a box of books at constant speed up a 30° ramp, applying a force of 200 n directed up the slope. the coefficient of sliding friction is 0.18.

Two trains leave the same station at the same time. The first train travels north at 60 mph. The second train travels west at 45 mph. Find how fast the distance between the trains is changing two hours after the trains have left.

If the room radius is 4.5 m, and the rotation frequency is 0.8 revolutions per second when the floor drops out, what is the minimum coefficient of static friction so that the people will not slip down?

Energy of motion is known as what energy

While a constant total force of 17 n is exerted on a cart, the cart's acceleration is 5 m/s2. find the mass of the cart?