If an element has 10 electrons, how many of them will be in the 2nd energy level?

How does the use of hydroelectric energy compare to the use of coal? a. Hydroelectric energy is more commonly used than coal. b. Hydroelectric energy is associated with less waste production than coal. c.

A grocery shopper tosses a (n) 9.1 kg bag of rice into a stationary 19.3 kg grocery cart. The bag hits the cart with a horizontal speed of 6.6 m/s toward the front of the cart. What is the final speed of the cart and bag? Answer in units of m/s.

How do waves behave differently to Earth's interior as they encounter the boundaries of different mediums?

If a simple machine reduces the strength of a force, what must be increased? A. the distance that the force moves B. the work the simple machine performs C. the speed of the input force D. the size of the simple machine

During cooling, the kinetic energy of the molecules falls. Why does this happen? A. The motion of the molecules increases. B. The motion of the molecules slows down. C. The Van der Waals forces between molecules decrease. D.

An object has an acceleration of 24 m/s/s. How long would it take the stationary object to reach a velocity of 6.8 m/s?

What is normal distribution in statistics?

Which of the following water samples would be considered acidic

A linearly-polarized electromagnetic (EM) wave has an electric field with amplitude 1000 V/m. You hold a a linear polarizer in front of it and rotate the polarizer so that all of the EM wave is blocked. You then rotate the polarizer 30 degree.

Let y'=4 x. find all values of r such that y = rx^{2} satisfies the differential equation. if there is more than one correct answer, enter your answers as a comma separated list.