How does the quantum mechanical model of the atom describe electrons

Sarah cycles 30 miles to her grandmother's house at a steady speed of 10 mph. If she leaves home at 2:00 pm, what time will she arrive?

This igneous rock contains flattened pieces of pumice and small crystals of quartz and feldspar. what type of eruption probably formed this rock?

Energy is the ability to do work. True or false

Why do tides happen every 50 minuets?

When light waves pass through the lenses of a pair of glasses the light waves

An elevator has mass 600 kg, not including passengers. the elevator is designed to ascend, at constant speed, a vertical distance of 20.0 m (five floors) in 16.0 s, and it is driven by a motor that can provide up to 40 hp to the elevator.

Suppose that 100g of aluminum at 23 degrees C is added to 50g of water at 95 degrees C. Determine the equilibrium temperature of the mixture. Ignore heat loss to the container or the surroundings.

Which property of coal makes it ideal for use in a power plant? Check all that apply. It burns easily. It makes ash. It is renewable. It produces a lot of energy. It contains mercury.

Bob is coming toward you at a speed of 75 km/hr. You throw a baseball in his direction at 75 km/hr. What does he see the ball doing?

Give 3 examples of something with potential energy.